Really, in all honesty, I think what most of us want to know is what amp hours mean in practical terms, not technical terms. It's great to know what amp hours mean when purchasing a battery; that's helpful. But what is more helpful is the information I need on a day-to-day basis: "How long can I run my fan, fridge (or whatever) before I drain my battery?" I know that level of detail depends on the load, but that's where specific examples/scenarios are needed. The 400 watt inverter kinda got to this level of practical information, but the video would have been more helpful (practically), if there had been more emphasis on devices/appliances drawing energy from the battery. At least for me, it would have.
12v car batteries for RV's/Fridges/Camping get complicated quickly. I think the complication really comes from spending our entire lives with throwaway DC batteries in remotes and RC cars/drones etc. usually we run them til flat then throw away and replace. With these batteries we want to measure a halfway mark of usage time before we recharge them back again. This changes everything and throws us into a new lexicon of watts/volts/amps and rate of discharge.
Making use of the ruclips.net/user/postUgkxcJ22tnHH9l1vjdIdEIG27iOG55P7LXI8 reconditioning plan, I just saved 2 auto batteries from being completely junked. The guides were very simple to follow. I wish I would have found this years ago! You may use the guide to recondition any battery type
Thank you. I didn't know what what that other hour rating was. I never thought about the fact that the faster you drain the battery, the more "inefficient" it becomes.
When you use lead-acid batteries in an emergency lighting system. a run-time of one hour is required, ergo one reason for the one hour rating. The rating is known as the amp-hour rating not the amps per twenty hour rating. Twenty hours happens to be the point that gives the best economy. Some manufacturers quote their capacities at the 10 hour rating. Some even put a 1 hour and 5 hour rating on their batteries as well as the 10 and 20 hour ratings. If you look at the spec sheet for some batteries, it will have the number of minutes that you can draw the amps of the amp-hour rating to fully discharge the battery. For example a DiaMec DMD12-100 (12V 100AH) SLA battery has the following specs... 20 hour rate (5.15A) = 103AH, 10 hour rate (10A) = 100AH, 5 hour rate (16A) = 80AH, 1 hour rate (63A) = 63AH, And the time in minutes to fully discharge this battery at 100A = 35 minutes approx (from a graph supplied). It is a lot easier to multiply the amp-hour rating by the battery voltage and work your maths in watt hours when using inverters. At this stage you can set the 50% DoD to get more cycles/lifetime from your battery bank. You also have to understand the efficiencies of your system. Good inverters are roughly 85 to 90% efficient and this must be taken into consideration when designing battery operated systems.. To fully charge a completely discharged 100AH lead-acid battery, you will need to put in 130 amp-hours of charge and this figure will vary a little bit depending on the battery construction and plate chemistry. The reason for the extra energy required is that it is an electro-chemical reaction. You have to convert lead sulfate and dilute sulfuric acid to lead and lead oxide and more concentrated sulfuric acid. If you regularly discharge a deep cycle battery below its 50% DoD, you will end up having fewer cycles or shorter battery life. Please note, I stated "regularly". The Panasonic VRLA Battery Handbook has graphs for battery life (number of complete cycles) and DoD. These figures vary with battery type, style and plate design. Complete discharge = 350 cycles or about a year. 60% DoD = 800 cycles 30% DoD = 1600 cycles The less you make a battery work, the longer it will last. It is plate corrosion that kills most batteries, not sulfation. Lead-acid batteries were invented in 1859 and have remained pretty much the same since then. Some companies have tweaked the chemistry a little to get longer shelf life or reduce grid corrosion and make them less susceptible to heat and vibration failures but the heavier the current draw, the shorter the run time. This is Peukert's Law and was discovered shortly after Gaston Planté invented the batteries. Wikipedia has a very good article abut it.
I have a 14 Amp 120 volt corded electric mower. I plan to convert it to cordless using a battery. I have a 150 Watt DC/AC inverter. Will a 12 Volt 35 Amp/hour battery work? I just need to use it for 30 to 45 minutes. Thanks for your help
I could have said... "Yeah, right!" and left it at that but I decided to do the math for you. The electric motor is rated at 2.25 horse power. The motor requires a 2000 watt inverter... 14 X 120 = 1680 watts plus a bit for inrush current. 1680 / 12 = 140 amps (wattage divided by voltage gives current at 12 volts). Now add another tenth of that current for inverter losses... 154 amps for 45 minutes and that would fully deplete the battery and if you do that too often you will have a very short battery life. Deep cycle batteries will tolerate an 80% DOD (depth of discharge) but need to be recharged asap. The trouble with lead acid batteries is that when you draw a lot of current from them, the amp-hour rating or capacity is reduced. It's called Peukert's Law. I looked through my Panasonic VRLA handbook and the closest battery to your requirement is 12volts and 200amp-hours. It weighs 57kGs and will deliver 154 amps for 45 minutes. It's the biggest 12 volt one they make in that style. As you can see... well I hope you do, a system like that isn't really practical. You'd get a good workout pushing it around, mind you. This is why petrol engines are still preferred for things like lawn mowers and they need a six or more horsepower engine to do the same job. You could use a generator to supply the power if you aren't near a power supply but it would need to be about 3000 watts to allow plenty of energy to start the motor. Generators don't have that reserve that most inverters do. You could trade in your mower for one of those latest light-weight 36 volt or higher lithium battery powered lawn mowers. Bosch make a good one... according to Robert Llewellyn on the "fullychargedshow"... ruclips.net/video/p8n6HLjD0XU/видео.html Have a look.
I appreciate your comment you seem to know quite a bit about batteries ... In my experience with invertors and batteries I've found that invertors cut off at ten volts ...the 2 750 watt invertors that I own (by two different manufacturers) both emit an audible alert to let you know that the battery voltage is getting low if one doesn't crank the alternator generator with in a couple of minutes after hearing the alert the invertor will shut down ...it's beyond me why people still post videos saying you one should charge there batteries when the invertors drain them to half capacity ...it simply isn't possible to drain a battery below ten volts with an invertor...when I was building my battery invertor set up (the video is here on RUclips) I watched a lot of videos and all said the same thing about draining the battery to half capacity... Can you imagine how surprised I was to find out that invertors don't actually drain batteries to half capacity .... After finding this out by experience I quit trusting off grid RUclipsrs etc. And came to realize that most maybe all have never really used there systems enough to know that you'll never drain a batteries to half capacity with an invertor....
Hello i really love the video plese sir if i have a freezer who pull230 watt 3-12w bulb=36w, 1 fan 60w, 1 flat screen tv 48w who make a total of 364watts. I know 500 w inverter should be able to handle the wattage, what size of battery bank i need for this to run them for 6 hours please
230 watts x 6 hours = 1380 wh 12w x3 x6 = 216 wh 60w x 6 = 360wh 48w x 6 = 288 wh total wh is 864wh multiply times days of bad weather (min 2 days) Assuming lowest temp your batteries will see is 40F, use the ALtE solar calculator www.altestore.com/store/calculators/off_grid_calculator/ Enter 12v for your inverter voltage Battery bank voltage is 431 amp hours
@@DeepcyclebatterystoreSanDiego thank u very much for your answer i am electrician i live in the bahamas nassau i want to kbow more about the solar system your video is very useful to me thank u.
The Voltage charts are for at rest or with loads? I've been using a really cheap $100 Excide 115AH deep cycle battery as my starter and house battery for about a year and half. I've taken it down to 11.5v about 50 nights. I am wondering how long it will last. One number that confuses me is Reserve capacity. If my battery is rated 115AH, I presume that means i have about 700WH of usable but have never been able to achieve that. Also If they claim it has a 205 minute reserve capacity @25amp, what does that REALLY mean.. not really (205*12*25)/60 = 1025WH of usable right?? How is it possible that a 12 fridge that is consuming about 40watts took my battery from 12.6v to 12.1v from 9pm to 6am?
Hi I have 2 55ah Duracell 12v agm batteries in my van hooked up together being charged by 700 watts worth of solar on the roof, I am in the market for getting an inverter possibly just a 500 watt 12 volt hookup, my question is what is the total wattage my system currently makes? Would it be (55x2) x 24 volts= 2640 watts? I’m trying to see how long my battery can last before I run out of power, for my off grid set up and want to know if I can even run something like my gaming console (90 watts per hour I think) thanks so much for any feed back
Thanks for the information. A question though. if I have a RV Fridge that pulls 5 amp hours, and two 6 volt batteries rated for 225 amp hours, would the calculation be: (225x2)/2=225/10 hours=22.5 amps draw. this figure seems to say that I would not have a problem boon docking overnight with the fridge running. Is this correct? Thanks.
If you are using AGM firefly batteries with DOD or around 95% would you still divide by as much as 2 for a margin of safety when calculating Amp hrs and runtime?
Great video. Question, my battery is 48v 20ah. My controller is 48v 20ah. Manufacturer upgrade from 20ah b/c none in stock. Will this combo work? Heard it could damage battery. I use PAS too when riding. Hope you can help. /Bklyn👑
I don't think a controller is rated using ah do you mean amps? your controller is a 48 volt 20 amp unit so multiply those numbers and you get a 960 watt machine, ok that has nothing to do with matching your battery aside from it needing to match the volts, you can't use a 24 volt battery with a 48 volt controller cause you won't get the most power out of it, and you can't use a 60 volt battery with a 48 volt controller cause you will fry it ie burn it up, you did not tell us what batteries you are using again if lead acid or AGM than you half your 20ah and it's really 10ah usable, so 10ah divided by 20 amps means you can use it for 1/2 an hour, hope that helps.
First , thank you. enjoyed the video. My Question (answering my own) ( correcting me ) is quite simple, if asked. I like to run a Lighting set up max 12 Hr 15W (900 lum)Devide by 12 is under 1A. 105 devide by 1A will give me a 105 hours. on a 210AH battery? If I run twice it will be in half 55 hr ofrun time. the set up all well be 12v no inverter? A deep cell battery is what I should be looking for???
thank you I am getting a Deep cell 210 AH battery. $120 home depot. will be about the size I need. thank you for the correction I changed the LEd to a 25Watt .. If i start to add to the set up a larger batter will be required thanks again for your help. and repy.
Thank you for the explanation. I want to use AGM Battery for a Grow Indoor System. The AGM battery will only need to power for 16 hours a day a LED Spectrum Lamp of the following specifications. Specifications - 110watts and 85-265V. Which battery you recommend to use for a solar recharge AGM battery for a led lamp grow indoor system?
If you use a 12v inverter need about 300 amp hour battery bank If you use a 24v inverter need about 150 amp hour battery bank for one day of power given you have 300 watts or more of solar array
I bought a 100watt solar system to charge my batteries. I have a 750-1500 watt inverter. I want to be able to run a 700watt coffee maker, 700watt toaster and 700 watt microwave but not at the same time. Can I get bye with one high amp battery.? This setup would be for tent camping.
1500 watt inverter / 12v = 125amps to size cable (look up online adding cable length) 700watt microwave / 12v for a few minutes = approx 3 amps (not calculating inefficincy losses) First idea if using lead acid is two 6v golf cart batteries in series = 12v However one 100 watt panel putting out about 5amps not enough alone to recharge batteries from 50% to 100% in one day
Could I ask a question and it’s a tricky one , I am about to move into a small boat with a plan to use 2 , 110 aph 12 v deep cycle battery’s to power a 40lbs electric trolling motor and on the motor there are 5 settings 1 through to 5 and 3 reverse settings, iv done a little research but I am a beginner with all this , to my knowledge it’s draws at 20w but I’m not sure if that’s per hour ? And I need to achieve atleast 7 hours of travel per day
Yeah, very good and understandable. While I view this I gotta realize that the battery is also going to lose about 10 efficiency also because of possible distance of cabling and also heat stress. While these may seem trivial (or not)? The conditions that batteries are tested under and label printing are of the most perfect conditions to boost their usefulness. Thank You for posting critical information here.
hi great video! I have a 12v marine battery hooked up with a 750w power inverter. I used with a tv and couple fans. It runned 4hours before the inverter started to beep. so do I need to run it for less time before the inverter start to beep?
What I want to know is can I run my frozen yogurt machine that’s 208 one phase that’s rated for at least 27 amps and max 35 amps and LRA is 81.00 I was told that it needs a 8500 watt generator but they’re too loud so is it possible to run in batteries for about 10 hours a day
Yes it is . but 2 things. running ur machine on 220 will more than half the amps needed . depending on sun / power access / amount u want to fuss with charging you can go solar/ micro wind to 6v batteries run in parallel to 48 volts (cheapest options are usually 6v golf cart batteries) you can also go with like a tesla powerwall (or make ur own with cells which will triple ur capacity for around the same price) theres also companies like bluetti, jackery etc that sell battery packs with MASSIVE amp hours theres on on kickstarter right now i wish i could jump on but its MASSIVE too and costs about 3500 with solar panels . Hope this 2 year old comment maybe still relevant
So having a 12v, 40 amp hour lead battery, what happens when I connect my 2000 watt, 12 v inverter and want to run a load of 1 kw microwave for 5 mins and 100 watt lights for six hours?
Jeff I have watched this video a couple of times . My question . If you have a 5000 btu a/c . 110 volt . The a/c is 1800 watt to start and would run at 1500 watts. With a 3000 watt inverter that would 250 amps. You could run the a/c for 3 hours .Am I right .Thank You .
Thank you for the helpful information. I have a question, though. If you're running something that only draws 200 watts through a 1000 watt inverter, will you be drawing 200 or 1000 watts from the battery? You mentioned the size of the inverter affecting the draw, so I want to make sure I'm using the right inverter with the right appliance. If my 1000 watt inverter is overkill, then maybe I should pick up a smaller one as well. Thanks for any advice you might have. Sorry if it's a dumb question. I'm a total noob.
Not a dumb question I’m in the same boat. Does my 700 watt inverter really run at max if the load is less? I need to reverse engineer this. If my fridg only run at 3a/120v max intermittently I would still use that as my calculation number as my load. Now where do I go from here?
hello. i want to run 2 krk monitors (online its said both are 50watt each) for 6-8 hours off grid. is this possible with deep cycle batteries? how much and which would i need. please help me im stuck in my research
That is what I have in my Rpod 179. 4 gc2 6volt batteries in series and parallel with 3 100watt solar panels and a Xantrex HF Freedom 2000watt inverter.
oi oi oi, can u pls explain the calculations with examples (using the same numbers u talked about in the vid) typed in the description, as it still sounded confusing as u verbally explained it. Thank YOU in advance.
Please help. My espresso machine is 3,000 watts. I want to run my espresso machine using a deep cycle battery. Can I get a 12v 100Ah AGM deep cycle battery and pair it with 4,000 watts inverter? If it's possible and if my calculation is correct will it give me at least 15 hours of power? Thank you sir.
No your calculation is incorrect I wish it was this way it would be cheap to have backup power .... 3kw coffee machine / 12v = 250ah 1-12v 100ah will last 20min max discharge down to 0 since the voltage will drop below 10v very fast good luck if you can make one or 2 coffee....
Hi, can someone help me with something? I have a positive and negative wire going to the back of my van. This wire was used to power a wheelchair lift. I gave the lift away and now I have the cut wires. How can I figure out how many amps it can provide? I know hoe to test volts but how do I test those two wires, positive and negative, to know how many watts are coming out? Thank you.
search the make and model of the chair lift from before. I will have data of power needed to operate. Guessing you had at least the needed amps and watts to operate
(Water Pump 8 amps x 220 volts= 1760 watts.) So the 220 volts or 1760 watts won't make a difference because that's in the inverter, Correct? All I need to look at is amps as far as how long the battery will last? So I would be able to get at least 10 hours(50% of Battery) of 8 amps at 220 voltage with one T-105 as long as I have the correct inverter?
Thank God, For some reason that took a while for me to get. I do understand that I would want to run 2 batteries to convert it to 12 volt for a 12v to 220 inverter.
Can a Battery show full charge on a volt meter , and still be missing the Amps - where it wont do anything to crank over an Engine?? Thanks in advance.
sup jeff,i was wondering if i could use a 100ah solar battery for my 2000 watt amplifier in my car? the amp does a continuous 2200 watts at 14.4 volts. and i have a 200 amp alternator. Universal UB121000-45978 12v 100AH Deep Cycle AGM Battery.
Deep Cycle Battery San Diego so if you had 100ah(after taking half of rated ah) divided by say 200amps would it still be the same mathematical approach and result in about 30min of supply?? Also I know two 6v can be ran in series but can they be charged safely with a decent size car alternator or does it depend on the batteries in question?
I am so confused by how complicated batterys can get. I thought agm batterys were always sealed and could not have water added? Do flooded and agm batterys both use the same fluid inside of them?
No one seems to know on RUclips that you need 120 volts of power 5X the energy of a 12 volt battery therefore the output of that battery powering a 120 volt device dischargers that battery much quicker but no one seems to know that for some strange reason and their amp calculations for 120 volts is all wrong
I keep reading that, while a battery might be a 200 amp hour @ 20 hour rate, it’s “usable” amps is a lot less. Why is that? I don’t understand what the relevance of 200 amps is , if it only has half that in “usable” amps.
That's like buying a full tank of gas but you can only use half of it, so when you get to half a tank you gotta go fill up again. Some genius out there needs to invent a battery that one can use the full potential of a battery, you buy a 200 ah battery, you can use 200 ah from the battery, now that would be lovely.
Dear Sir, Wish u all the best Sir, Can I connect two deep cycle batteries together but both is deferent AH Battery # 1 is 75 ah Battery # 2 is 200 ah And how many total AH Thank
Not advised, the lesser ah battery will come up to charge sooner than the larger ah battery. The charger will shut off before the larger battery is 100% charged
It sounds like you are explaining Ah's for batteries that are not getting charged up by solar/wind or whatever means. Wouldn't the batteries have more Ah's for a 20 hour period if they are being charged daily?
That is a recent Hot Topic. A battery to battery charger manufactured by Sterling is a solution because the alternator output is diminished once it passes through the primary battery
Ok one thing i dont understand is why would AH be for the battery down to zero? I dont think thats correct. I thought AH rating already tales into account the safe discharge level. Why wouldnt they, it wouldnt make sense to not apply that already
1cleandude Thanks... I guess 55AH would be ok if I don't try to run to much from it.. I'm learning about all this solar stuff, still ain't got the hang of it all... But in time I will.... I hope any way LOL
Someone, please help if you may... I have 2x 12V batteries in parallel. they are lead acid. it sais they have 105 Amps at 20 hrs/each. So in parallel does that mean i have 210 Amp hours at 20 hours? I have 100W light bulb, but if i run it off my 700w inverter, with these batteries, i only get 2.5 hrs of run time, as i dont want to go below 12.1V....i turn it off to save the batteries life. Why am i getting only 2.5 hrs of run time? Please help...thanks.
100 watt light bulb running for 24 hours equals 2400 watt hours divided by 12v inverter equals 200 amp hours bu t at 50% dod limit, you would need a 400 amp hour battery bank check your inverter connection to the battery bank, pos on one battery neg on other
You do not it is for starting batteries only they are there it you need to start a engine if your starting battery is dead and the is the only battery you have that is charged
Deep Cycle Battery San Diego I am putting a car stereo together, I have a 220 amp alternator, and I am going to be running about 10,000 rms watts, I know I need extra batteries in the rear to power the two amps, but I am unsure of how big and how many amp hours I will need in total, I am more interested in amg deep cycle.
I think the best take away from this video is right at the beginning where you state that Ah rating depends on the discharge time both of there batteries are rated based on a 20h discharge time. This is so important because some people want to run a 1200W induction cooktop off a battery. At 12 V that will draw 100A!!! The 105Ah rating does not mean you can use the cooktop on full power for an hour. the discharge has to be over 20 hours!!! ... With 85% inverter efficiency the current draw goes up to 120 Amps. The video gets really confusing when you say a 400W inverter at 12V and you have a 6V battery. Later you mention that you need two 6V batteries in series to drive the inverter. I know youtube wants longer videos but please keep them short and sweet.
I'm sure the gentleman in the video knows his stuff... But we have to keep in mind that invertors won't run on anything under ten volts there by making a battery's amp hour rating irrelevant when your battery reaches ten volts the invertor will emit an audible low voltage warning...ignore the warning and you'll soon find yourself without electricity ... Edit literally five seconds after posting my comment the gentleman in the video is talking about discharging a battery to half it's capacity... Let me say it again ...an invertor will not run on anything under 10 volts making it impossible to drain a battery to half capacity using an invertor... I suppose I'm going to have to post a video showing this is true to finally clear this myth up about draining your battery's to half capacity with an invertor...
Really, in all honesty, I think what most of us want to know is what amp hours mean in practical terms, not technical terms. It's great to know what amp hours mean when purchasing a battery; that's helpful. But what is more helpful is the information I need on a day-to-day basis: "How long can I run my fan, fridge (or whatever) before I drain my battery?" I know that level of detail depends on the load, but that's where specific examples/scenarios are needed. The 400 watt inverter kinda got to this level of practical information, but the video would have been more helpful (practically), if there had been more emphasis on devices/appliances drawing energy from the battery. At least for me, it would have.
glxy55 I would have to agree completely...
12v car batteries for RV's/Fridges/Camping get complicated quickly. I think the complication really comes from spending our entire lives with throwaway DC batteries in remotes and RC cars/drones etc. usually we run them til flat then throw away and replace. With these batteries we want to measure a halfway mark of usage time before we recharge them back again. This changes everything and throws us into a new lexicon of watts/volts/amps and rate of discharge.
Well find out how many amps the system will draw from the battery first
I got my 200amp deep cycle batteries from Carbonfreeheat.com they are huge
@Soup Can Watts divided (not times) Volts gives you Amps.
Making use of the ruclips.net/user/postUgkxcJ22tnHH9l1vjdIdEIG27iOG55P7LXI8 reconditioning plan, I just saved 2 auto batteries from being completely junked. The guides were very simple to follow. I wish I would have found this years ago! You may use the guide to recondition any battery type
I watched three clips on this topics ..You ware strait forward ,clear simple to the T..Great job..Keep it up..thnx sir
This video makes all the sense in the world, this is the best video I've ever seen on RUclips, thanks very much.
Jeff thanks for the explanation on AMP hours that really helps for my portable power generator that I'm building.
Great job man. This was perfect... Short sweet and made absolute sense. Thank you.
Thanks for the explanation of 100ah @ 20hrs. I understand that now and it helps a ton. 👍
Thank you. I didn't know what what that other hour rating was. I never thought about the fact that the faster you drain the battery, the more "inefficient" it becomes.
Thanks for making this video simple. I understand it more better.
When you use lead-acid batteries in an emergency lighting system. a run-time of one hour is required, ergo one reason for the one hour rating. The rating is known as the amp-hour rating not the amps per twenty hour rating. Twenty hours happens to be the point that gives the best economy. Some manufacturers quote their capacities at the 10 hour rating. Some even put a 1 hour and 5 hour rating on their batteries as well as the 10 and 20 hour ratings. If you look at the spec sheet for some batteries, it will have the number of minutes that you can draw the amps of the amp-hour rating to fully discharge the battery.
For example a DiaMec DMD12-100 (12V 100AH) SLA battery has the following specs...
20 hour rate (5.15A) = 103AH,
10 hour rate (10A) = 100AH,
5 hour rate (16A) = 80AH,
1 hour rate (63A) = 63AH,
And the time in minutes to fully discharge this battery at 100A = 35 minutes approx (from a graph supplied).
It is a lot easier to multiply the amp-hour rating by the battery voltage and work your maths in watt hours when using inverters. At this stage you can set the 50% DoD to get more cycles/lifetime from your battery bank. You also have to understand the efficiencies of your system. Good inverters are roughly 85 to 90% efficient and this must be taken into consideration when designing battery operated systems..
To fully charge a completely discharged 100AH lead-acid battery, you will need to put in 130 amp-hours of charge and this figure will vary a little bit depending on the battery construction and plate chemistry. The reason for the extra energy required is that it is an electro-chemical reaction. You have to convert lead sulfate and dilute sulfuric acid to lead and lead oxide and more concentrated sulfuric acid.
If you regularly discharge a deep cycle battery below its 50% DoD, you will end up having fewer cycles or shorter battery life. Please note, I stated "regularly".
The Panasonic VRLA Battery Handbook has graphs for battery life (number of complete cycles) and DoD. These figures vary with battery type, style and plate design.
Complete discharge = 350 cycles or about a year.
60% DoD = 800 cycles
30% DoD = 1600 cycles
The less you make a battery work, the longer it will last. It is plate corrosion that kills most batteries, not sulfation.
Lead-acid batteries were invented in 1859 and have remained pretty much the same since then. Some companies have tweaked the chemistry a little to get longer shelf life or reduce grid corrosion and make them less susceptible to heat and vibration failures but the heavier the current draw, the shorter the run time. This is Peukert's Law and was discovered shortly after Gaston Planté invented the batteries. Wikipedia has a very good article abut it.
I have a 14 Amp 120 volt corded electric mower. I plan to convert it to cordless using a battery. I have a 150 Watt DC/AC inverter. Will a 12 Volt 35 Amp/hour battery work? I just need to use it for 30 to 45 minutes. Thanks for your help
I could have said... "Yeah, right!" and left it at that but I decided to do the math for you. The electric motor is rated at 2.25 horse power.
The motor requires a 2000 watt inverter... 14 X 120 = 1680 watts plus a bit for inrush current. 1680 / 12 = 140 amps (wattage divided by voltage gives current at 12 volts). Now add another tenth of that current for inverter losses... 154 amps for 45 minutes and that would fully deplete the battery and if you do that too often you will have a very short battery life. Deep cycle batteries will tolerate an 80% DOD (depth of discharge) but need to be recharged asap. The trouble with lead acid batteries is that when you draw a lot of current from them, the amp-hour rating or capacity is reduced. It's called Peukert's Law. I looked through my Panasonic VRLA handbook and the closest battery to your requirement is 12volts and 200amp-hours. It weighs 57kGs and will deliver 154 amps for 45 minutes. It's the biggest 12 volt one they make in that style. As you can see... well I hope you do, a system like that isn't really practical. You'd get a good workout pushing it around, mind you. This is why petrol engines are still preferred for things like lawn mowers and they need a six or more horsepower engine to do the same job. You could use a generator to supply the power if you aren't near a power supply but it would need to be about 3000 watts to allow plenty of energy to start the motor. Generators don't have that reserve that most inverters do. You could trade in your mower for one of those latest light-weight 36 volt or higher lithium battery powered lawn mowers. Bosch make a good one... according to Robert Llewellyn on the "fullychargedshow"... ruclips.net/video/p8n6HLjD0XU/видео.html
Have a look.
Thanks for the explanation! I understand now why it was not working. I really appreciate the time you took to reply.
Not a problem, glad to have helped.
I appreciate your comment you seem to know quite a bit about batteries ... In my experience with invertors and batteries I've found that invertors cut off at ten volts ...the 2 750 watt invertors that I own (by two different manufacturers) both emit an audible alert to let you know that the battery voltage is getting low if one doesn't crank the alternator generator with in a couple of minutes after hearing the alert the invertor will shut down ...it's beyond me why people still post videos saying you one should charge there batteries when the invertors drain them to half capacity ...it simply isn't possible to drain a battery below ten volts with an invertor...when I was building my battery invertor set up (the video is here on RUclips) I watched a lot of videos and all said the same thing about draining the battery to half capacity... Can you imagine how surprised I was to find out that invertors don't actually drain batteries to half capacity .... After finding this out by experience I quit trusting off grid RUclipsrs etc. And came to realize that most maybe all have never really used there systems enough to know that you'll never drain a batteries to half capacity with an invertor....
thank you Jeff, best Ah explanation on the InterWebs!
I got bamboozled on the Ah trick for one battery. But!! Now I know, and it’s a cheap lesson. Thanks for the information...
Hello i really love the video plese sir if i have a freezer who pull230 watt 3-12w bulb=36w, 1 fan 60w, 1 flat screen tv 48w who make a total of 364watts. I know 500 w inverter should be able to handle the wattage, what size of battery bank i need for this to run them for 6 hours please
230 watts x 6 hours = 1380 wh
12w x3 x6 = 216 wh
60w x 6 = 360wh
48w x 6 = 288 wh
total wh is 864wh
multiply times days of bad weather (min 2 days)
Assuming lowest temp your batteries will see is 40F, use the ALtE solar calculator www.altestore.com/store/calculators/off_grid_calculator/
Enter 12v for your inverter voltage
Battery bank voltage is 431 amp hours
@@DeepcyclebatterystoreSanDiego thank u very much for your answer i am electrician i live in the bahamas nassau i want to kbow more about the solar system your video is very useful to me thank u.
Nice clear explanation, very useful for me. God bless you.
Blessings to you. Thank you
@@DeepcyclebatterystoreSanDiego thank you so much for sharing..... Have a great Holiday Season and God bless you and your family...😄
Thank you so much for your Educational..... Now I understand better....👍💪
The Voltage charts are for at rest or with loads? I've been using a really cheap $100 Excide 115AH deep cycle battery as my starter and house battery for about a year and half. I've taken it down to 11.5v about 50 nights. I am wondering how long it will last. One number that confuses me is Reserve capacity. If my battery is rated 115AH, I presume that means i have about 700WH of usable but have never been able to achieve that. Also If they claim it has a 205 minute reserve capacity @25amp, what does that REALLY mean.. not really (205*12*25)/60 = 1025WH of usable right?? How is it possible that a 12 fridge that is consuming about 40watts took my battery from 12.6v to 12.1v from 9pm to 6am?
Hi I have 2 55ah Duracell 12v agm batteries in my van hooked up together being charged by 700 watts worth of solar on the roof, I am in the market for getting an inverter possibly just a 500 watt 12 volt hookup, my question is what is the total wattage my system currently makes? Would it be (55x2) x 24 volts= 2640 watts? I’m trying to see how long my battery can last before I run out of power, for my off grid set up and want to know if I can even run something like my gaming console (90 watts per hour I think) thanks so much for any feed back
Wish I could like this vid twice lol been racking my lil brain trying to figure out ah for soundsystem..
Thanks, your ah breakdown was very helpful !
Great video! So if I have a 12v 7Ah/20 hour battery and I want to run a 13A 120v electric mower Probably I can ‘t do it.
Thanks for the information. A question though. if I have a RV Fridge that pulls 5 amp hours, and two 6 volt batteries rated for 225 amp hours, would the calculation be: (225x2)/2=225/10 hours=22.5 amps draw. this figure seems to say that I would not have a problem boon docking overnight with the fridge running. Is this correct? Thanks.
Thank you . You just answer my question . I'm not a wizard but you did made it easy for me to understand
If you are using AGM firefly batteries with DOD or around 95% would you still divide by as much as 2 for a margin of safety when calculating Amp hrs and runtime?
Great video.
Question, my battery is 48v 20ah. My controller is 48v 20ah. Manufacturer upgrade from 20ah b/c none in stock.
Will this combo work? Heard it could damage battery. I use PAS too when riding.
Hope you can help.
/Bklyn👑
I don't think a controller is rated using ah do you mean amps? your controller is a 48 volt 20 amp unit so multiply those numbers and you get a 960 watt machine, ok that has nothing to do with matching your battery aside from it needing to match the volts, you can't use a 24 volt battery with a 48 volt controller cause you won't get the most power out of it, and you can't use a 60 volt battery with a 48 volt controller cause you will fry it ie burn it up, you did not tell us what batteries you are using again if lead acid or AGM than you half your 20ah and it's really 10ah usable, so 10ah divided by 20 amps means you can use it for 1/2 an hour, hope that helps.
First , thank you. enjoyed the video. My Question (answering my own) ( correcting me ) is quite simple, if asked.
I like to run a Lighting set up max 12 Hr 15W (900 lum)Devide by 12 is under 1A. 105 devide by 1A will give me a 105 hours. on a 210AH battery? If I run twice it will be in half 55 hr ofrun time. the set up all well be 12v no inverter? A deep cell battery is what I should be looking for???
Watts = volts x amps
15 watts x 12 hours = 180 watt hours / 12v (inverter) = 15A x 2 = 30A battery for one day power
thank you I am getting a Deep cell 210 AH battery. $120 home depot. will be about the size I need. thank you for the correction I changed the LEd to a 25Watt .. If i start to add to the set up a larger batter will be required thanks again for your help. and repy.
Thank you for the explanation. I want to use AGM Battery for a Grow Indoor System. The AGM battery will only need to power for 16 hours a day a LED Spectrum Lamp of the following specifications.
Specifications - 110watts and 85-265V.
Which battery you recommend to use for a solar recharge AGM battery for a led lamp grow indoor system?
If you use a 12v inverter need about 300 amp hour battery bank
If you use a 24v inverter need about 150 amp hour battery bank
for one day of power given you have 300 watts or more of solar array
Why is Paul McCartney telling me about battery
Thanks, this is perfect, just what I was looking for.
I bought a 100watt solar system to charge my batteries. I have a 750-1500 watt inverter. I want to be able to run a 700watt coffee maker, 700watt toaster and 700 watt microwave but not at the same time. Can I get bye with one high amp battery.? This setup would be for tent camping.
1500 watt inverter / 12v = 125amps to size cable (look up online adding cable length)
700watt microwave / 12v for a few minutes = approx 3 amps (not calculating inefficincy losses) First idea if using lead acid is two 6v golf cart batteries in series = 12v
However one 100 watt panel putting out about 5amps not enough alone to recharge batteries from 50% to 100% in one day
late onto this one.... tyvm for helping out we are plebs but interested... cheers
Please could you advise.....
I have a 7.2AH (20HR) battery. What charger would I need to charge this battery?
you sir have earned my subscription. great information
Could I ask a question and it’s a tricky one , I am about to move into a small boat with a plan to use 2 , 110 aph 12 v deep cycle battery’s to power a 40lbs electric trolling motor and on the motor there are 5 settings 1 through to 5 and 3 reverse settings, iv done a little research but I am a beginner with all this , to my knowledge it’s draws at 20w but I’m not sure if that’s per hour ? And I need to achieve atleast 7 hours of travel per day
Yeah, very good and understandable. While I view this I gotta realize that the battery is also going to lose about 10 efficiency also because of possible distance of cabling and also heat stress. While these may seem trivial (or not)? The conditions that batteries are tested under and label printing are of the most perfect conditions to boost their usefulness. Thank You for posting critical information here.
hi great video!
I have a 12v marine battery hooked up with a 750w power inverter. I used with a tv and couple fans. It runned 4hours before the inverter started to beep. so do I need to run it for less time before the inverter start to beep?
also, what type of solar panels and solar controller do I need to run this or to recharge the marine battery?
Thanks
Yes, the beeping is a low voltage alert. A larger capacity battery would help
Thanks so much
Can you explain this
Can I power a wiper motor at 12v 2.5amp with a power bank output 12v 1.5amp
What I want to know is can I run my frozen yogurt machine that’s 208 one phase that’s rated for at least 27 amps and max 35 amps and LRA is 81.00 I was told that it needs a 8500 watt generator but they’re too loud so is it possible to run in batteries for about 10 hours a day
Yes it is . but 2 things. running ur machine on 220 will more than half the amps needed . depending on sun / power access / amount u want to fuss with charging you can go solar/ micro wind to 6v batteries run in parallel to 48 volts (cheapest options are usually 6v golf cart batteries) you can also go with like a tesla powerwall (or make ur own with cells which will triple ur capacity for around the same price) theres also companies like bluetti, jackery etc that sell battery packs with MASSIVE amp hours theres on on kickstarter right now i wish i could jump on but its MASSIVE too and costs about 3500 with solar panels . Hope this 2 year old comment maybe still relevant
I have a 24 volt system and both batteries have a 205 rc. so would I combine those to get my amp hours or run time. I'm using about 30 amps
if you have two 6v 205RC , for a 24v system you will need four 6v in series to increase voltage (6v x 4= 24v), Amps will remain constant
So having a 12v, 40 amp hour lead battery, what happens when I connect my 2000 watt, 12 v inverter and want to run a load of 1 kw microwave for 5 mins and 100 watt lights for six hours?
Thank you!
Sir..i have a 12v inverter..and its for electric fishing.. And it says current 32ah. What does it mean?do i nid to use 12v 32ahmp battery?
Jeff I have watched this video a couple of times . My question . If you have a 5000 btu a/c . 110 volt . The a/c is 1800 watt to start and would run at 1500 watts. With a 3000 watt inverter that would 250 amps. You could run the a/c for 3 hours .Am I right .Thank You .
New to your channel. if I were to take 2 - 12 group-31 DC batteries at 210ah per, will that give me 420?
Thank you for the helpful information. I have a question, though. If you're running something that only draws 200 watts through a 1000 watt inverter, will you be drawing 200 or 1000 watts from the battery? You mentioned the size of the inverter affecting the draw, so I want to make sure I'm using the right inverter with the right appliance. If my 1000 watt inverter is overkill, then maybe I should pick up a smaller one as well. Thanks for any advice you might have. Sorry if it's a dumb question. I'm a total noob.
Not a dumb question I’m in the same boat. Does my 700 watt inverter really run at max if the load is less? I need to reverse engineer this. If my fridg only run at 3a/120v max intermittently I would still use that as my calculation number as my load. Now where do I go from here?
hello. i want to run 2 krk monitors (online its said both are 50watt each) for 6-8 hours off grid. is this possible with deep cycle batteries? how much and which would i need.
please help me im stuck in my research
That is what I have in my Rpod 179. 4 gc2 6volt batteries in series and parallel with 3 100watt solar panels and a Xantrex HF Freedom 2000watt inverter.
good system
I have 24v 7 amp battery for power wheels can I replace it for 24v 12 amp?
Jeff, I love your videos! Keep it up brother
oi oi oi, can u pls explain the calculations with examples (using the same numbers u talked about in the vid) typed in the description, as it still sounded confusing as u verbally explained it. Thank YOU in advance.
ruclips.net/video/36WEnzgxZOc/видео.html
Can you explain RC (reserve capacity) compared to Ah?
So if I'm using a 12 volt 3500w inverter on those same batteries...I would get less hours of use?
Please help.
My espresso machine is 3,000 watts.
I want to run my espresso machine using a deep cycle battery. Can I get a 12v 100Ah AGM deep cycle battery and pair it with 4,000 watts inverter? If it's possible and if my calculation is correct will it give me at least 15 hours of power?
Thank you sir.
No your calculation is incorrect I wish it was this way it would be cheap to have backup power .... 3kw coffee machine / 12v = 250ah 1-12v 100ah will last 20min max discharge down to 0 since the voltage will drop below 10v very fast good luck if you can make one or 2 coffee....
Hi I have battery deep cycle 100 ah How much is the volume (cca)?
can i use cranking marine battery and use different cycle battery together for my amplifier
Hi, can someone help me with something? I have a positive and negative wire going to the back of my van. This wire was used to power a wheelchair lift. I gave the lift away and now I have the cut wires. How can I figure out how many amps it can provide? I know hoe to test volts but how do I test those two wires, positive and negative, to know how many watts are coming out? Thank you.
search the make and model of the chair lift from before. I will have data of power needed to operate. Guessing you had at least the needed amps and watts to operate
Is there a relationship between amps and torque for an electric car?
I have a well pump that pulls 8 amps AC at 220 volts . How many of those T-105's would I need to run the pump for 1 hour?
225ah / 20 hrs = 11.25 amps of battery for 20 hours until 100% discharged
(Water Pump 8 amps x 220 volts= 1760 watts.) So the 220 volts or 1760 watts won't make a difference because that's in the inverter, Correct? All I need to look at is amps as far as how long the battery will last? So I would be able to get at least 10 hours(50% of Battery) of 8 amps at 220 voltage with one T-105 as long as I have the correct inverter?
correct
Thank God, For some reason that took a while for me to get. I do understand that I would want to run 2 batteries to convert it to 12 volt for a 12v to 220 inverter.
Can a Battery show full charge on a volt meter , and still be missing the Amps - where it wont do anything to crank over an Engine?? Thanks in advance.
yes a surface charge on a battery will show voltage but not enough amps to spin over
I'm putting a 30 lb trolling motor on my kayak. Can you recommend a good affordable battery?
look for a 35 ah agm deep cycle
sup jeff,i was wondering if i could use a 100ah solar battery for my 2000 watt amplifier in my car? the amp does a continuous 2200 watts at 14.4 volts. and i have a 200 amp alternator. Universal UB121000-45978 12v 100AH Deep Cycle AGM Battery.
Jay Bee yes 100ah or larger will work
Ha was looking at the same batts.. but much larger setup..
Deep Cycle Battery San Diego so if you had 100ah(after taking half of rated ah) divided by say 200amps would it still be the same mathematical approach and result in about 30min of supply?? Also I know two 6v can be ran in series but can they be charged safely with a decent size car alternator or does it depend on the batteries in question?
I am so confused by how complicated batterys can get. I thought agm batterys were always sealed and could not have water added? Do flooded and agm batterys both use the same fluid inside of them?
How about telecom deep cycle batteries? Can it be use for solar ? Tnx!
Thanks for the explanations, very helpful
No one seems to know on RUclips that you need 120 volts of power 5X the energy of a 12 volt battery therefore the output of that battery powering a 120 volt device dischargers that battery much quicker but no one seems to know that for some strange reason and their amp calculations for 120 volts is all wrong
its you who is confused my friend ENERGY = AMPERE X TIME X VOLT X VOLT
so you can only use HALF the battery? how often can you go below before sustaining damage? what about reserve capacity?
Merry Christmas!
How batteries and of which size is required to run 500w pv module.
Do you have recommendations for 2 12 volt battery's that are not expensive for a beginner like me .
what is the application, if you can go with flooded, I prefer the Crown Severe Duty
Thank you very much... you cleared up a few things for me. :)
I keep reading that, while a battery might be a 200 amp hour @ 20 hour rate, it’s “usable” amps is a lot less. Why is that? I don’t understand what the relevance of 200 amps is , if it only has half that in “usable” amps.
Traditional 12-volt deep cycle lead acid batteries can only be discharged to 50% of their capacity. Beyond 50% the battery plates can be damaged.
That's like buying a full tank of gas but you can only use half of it, so when you get to half a tank you gotta go fill up again. Some genius out there needs to invent a battery that one can use the full potential of a battery, you buy a 200 ah battery, you can use 200 ah from the battery, now that would be lovely.
That helped....giving me a headache!!!!
Dear Sir,
Wish u all the best
Sir,
Can I connect two deep cycle batteries together but both is deferent AH
Battery # 1 is 75 ah
Battery # 2 is 200 ah
And how many total AH
Thank
Not advised, the lesser ah battery will come up to charge sooner than the larger ah battery. The charger will shut off before the larger battery is 100% charged
good stuff please make more videos
It sounds like you are explaining Ah's for batteries that are not getting charged up by solar/wind or whatever means. Wouldn't the batteries have more Ah's for a 20 hour period if they are being charged daily?
Very nicely explained!
Sir can i ask you? If i have 1 H.P motor how many batery i need to run thid motor for 1 hour?
140ah 12v del cell batt
If those were 6v batteries shouldn’t you dividing all those #’s by 2?
Can the newer lithium batteries be ran completely dead or should I keep above 51 percent
LiFePO 4 can be discharged to 90% DOD and have way more lifecycles, without the voltage sag lead acid has
Deep Cycle Battery San Diego thank you
At what SOC should the battery be ???
At what DOD should the battery be use????
What if you have a 300 amp alternator with a 155 ah battery. With it keep the battery ah up to par ?
That is a recent Hot Topic. A battery to battery charger manufactured by Sterling is a solution because the alternator output is diminished once it passes through the primary battery
Deep Cycle Battery San Diego so with my aftermarket subs and amps. Should I run a power wire from my alternator to my second battery to . And thanks
very good explanation, thank you
Ok one thing i dont understand is why would AH be for the battery down to zero? I dont think thats correct. I thought AH rating already tales into account the safe discharge level. Why wouldnt they, it wouldnt make sense to not apply that already
a discharged battery can have little or no amps
Optima® 8027-127 BlueTop® Deep Cycle & Starting Marine/RV AGM Battery D27M...... But they don't say what the amp hours are Would anyone have an idea ?
+Goodolboy One 55AH
1cleandude
Thanks... I guess 55AH would be ok if I don't try to run to much from it.. I'm learning about all this solar stuff, still ain't got the hang of it all... But in time I will.... I hope any way LOL
Excellent explanation!!! Thanks!!!
Thank you ! Very informative !
Can i connect two 12v battery to a 12v inverter
90% correct info
Someone, please help if you may...
I have 2x 12V batteries in parallel.
they are lead acid.
it sais they have 105 Amps at 20 hrs/each.
So in parallel does that mean i have 210 Amp hours at 20 hours?
I have 100W light bulb, but if i run it off my 700w inverter, with these batteries, i only get 2.5 hrs of run time, as i dont want to go below 12.1V....i turn it off to save the batteries life. Why am i getting only 2.5 hrs of run time?
Please help...thanks.
100 watt light bulb running for 24 hours equals 2400 watt hours divided by 12v inverter equals 200 amp hours bu t at 50% dod limit, you would need a 400 amp hour battery bank
check your inverter connection to the battery bank, pos on one battery neg on other
How do i convert cold cranking amps into amp hours???
You do not it is for starting batteries only they are there it you need to start a engine if your starting battery is dead and the is the only battery you have that is charged
NICE ONE JEFF
Really appreciated..god bless you man!
Excellent Video ...
Deep cycle batteries are never discharged deeper than 50% depth of discharge so not to hurt them
Deep Cycle Battery San Diego
I am putting a car stereo together, I have a 220 amp alternator, and I am going to be running about 10,000 rms watts, I know I need extra batteries in the rear to power the two amps, but I am unsure of how big and how many amp hours I will need in total, I am more interested in amg deep cycle.
Firefly foam carbon AGM batteries can go as low as 15% DOD with no ill effects.
Good explanation.
Your amazing! This video helped!
I think the best take away from this video is right at the beginning where you state that Ah rating depends on the discharge time both of there batteries are rated based on a 20h discharge time. This is so important because some people want to run a 1200W induction cooktop off a battery. At 12 V that will draw 100A!!! The 105Ah rating does not mean you can use the cooktop on full power for an hour. the discharge has to be over 20 hours!!! ... With 85% inverter efficiency the current draw goes up to 120 Amps. The video gets really confusing when you say a 400W inverter at 12V and you have a 6V battery. Later you mention that you need two 6V batteries in series to drive the inverter. I know youtube wants longer videos but please keep them short and sweet.
BRO I have 12v and 60Ah battery but its backup is less than 2 hours and I charge the battery with UPS and my UPS is 1000va
I'm sure the gentleman in the video knows his stuff... But we have to keep in mind that invertors won't run on anything under ten volts there by making a battery's amp hour rating irrelevant when your battery reaches ten volts the invertor will emit an audible low voltage warning...ignore the warning and you'll soon find yourself without electricity ... Edit literally five seconds after posting my comment the gentleman in the video is talking about discharging a battery to half it's capacity... Let me say it again ...an invertor will not run on anything under 10 volts making it impossible to drain a battery to half capacity using an invertor... I suppose I'm going to have to post a video showing this is true to finally clear this myth up about draining your battery's to half capacity with an invertor...
Very well I informative , thank you
great video. thanks