Important subject and a very good presentation, thanks! I have three 100Ah LFP and one 150Ah LFP and have added and subtracted them freely in parallel when needed and there has been no issues.
Excellent presentation. Thank you. I might have missed it in the video but it is worth mentioning the correct way to wire them to the load/charger via a diagram so that each battery gets the exact same load/charge. This honestly makes a real difference as more batteries are added to the bank.
I have a simple questions: Whats the MAXIMN number of lifepo4 batts you can have in Parallel? Beyond the stated "4" that we see all the time. And for laughs can they also be as we have seen different amps. 50+100+200+300+400+ etc+etc..... or any combo. How big can we go beyond 4 that's the question. This would show how we can expand our system over time. Not everybody can buy (4) 400+ amp.batts at the same time. Count me in as one of those people. Thanks
FYI The internal resistance of the battery will never change, the only thing what changes is the voltage difference between the internal battery (state of charge) versus the externally applied voltage, that drives the current going into out of a battery
Pretty cool info. To really geek out, would have been nice to see a voltage reading at the terminals of each battery (the 100AH and 460AH) when they were first connected together. The smaller 4.3V battery vs the larger 11.9V battery, difference of 7.6V@40A (the instant they were connected) was a 304W energy transfer. Once connected they, in theory, would have been pretty similar voltage, separated only by the resistance of the cables. Wonder what the V at each battery terminal was over the first few minutes.
Off grid basement goes into the specifics you just inquired about, go check out his video on parallel of different size batteries if you're still curious, good stuff👍
Very good video sir, thank you for sharing this with us. I just finished adding a set of four 100 amp hour batteries to my current set to make my system 10,000 plus for a longer run time should the power fail. I noticed the older set discharging a bit more than the newer set. Thank you again, keep showing us, we are playing attention.
Same chemistry, same voltage in parallel is fine even with different capacities, however I would probably use a fuse between the batteries and consider proper cable sizing for the current path.
@16:00 - The 100AH battery is delivering 37 amps and the 460AH battery is delivering 73 amps. The smaller battery represents about 18% of the total capacity, yet it's delivering almost exactly 33% of the total load. I find that curious. Less resistance from the pouch cells, which will change over time, meaning toward the end of a complete discharge cycle, the 100AH battery will be delivering well under 18%? Then I watched the rest of the video. :) Clearly, the larger battery is actually charging the smaller battery, throughout the discharge cycle. Very interesting.
Interesting. I have a Power Queen 12v 100ah group 24 bluetooth battery and am considering getting another 12v 100ah Lifepo4 battery to connect in series or parallel to add additional capacity to a power station. I was waiting until the exact same battery was on sale, but based on your findings it looks like I can purchase any other Lifepo4 12v 100ah battery even if it doesn't have bluetooth, is not a group 24, or even the same manufacturer. I'm assuming the same info applies if I decide to connect them in series to get 24v for faster charging? There is a lot of conflicting info about this on RUclips and your video really clears it up. Thanks.
I definitely would NOT recommend this for SERIES connections, because the batteries do not automatically try to equalize their charges in Series...you'd need an add-on balancer to do that. Also, in parallel, if one battery drops out (for over-voltage or under-voltage protection, or whatever), you just lose capacity...but if a battery drops out in series, the entire bank is down.
Thank you for explaining this so well.In my RV I currently have one 280ah lifepo4 from Battleborn (Love the brand but hate the price) I have asked Battleborn techs if I could buy a power queen 300ah and add it to my 12v system in the RV the increase my capacity. They said no because bms’s are different and they will not play well together. I also decided to contact Power Queen and asked the same question. They pretty much said the same thing. I did not specify whether I was wanting to run them in series or parallel. I asked these questions a year ago. From what you present it appears there would be no issues paralleling the 280ah Battleborn with a 300ah power queen. I would run each individual battery to a buss bar so that charging as well as discharging will remain fairly equal. Just wanted to ask you if I am understanding this correctly and if you see any issues in what I want to do. Thanks again. I just have 12v system in my rv.
This just happened to me yesterday. I bought a 140ah LifePo for our RV to help on our overnight stays on the interstate. After a handful of trips, I have been thinking of adding an additional 100ah maybe a mini from the same maker. I reached out to the maker and they said that it was not advisable. They recommend same same amp hour. I didn't think it would matter and it would appear in this video that it may be okay. Thanks for sharing your knowledge.
Are those fuses connected on the negative and positive terminals of the batteries? If they are what size are they? Also if only using one battery which battery terminal do you place the fuse on, the positive or negative? As always your channel is very informative.
always fuse off the POSITIVE terminal and the fuse rating should never be more than about 20-25% of the rated current of the cable that the fuse is protecting. You can fuse lower than that for greater/faster protection, but depending on what you're powering, you might nuisance trips (if a breaker) or frequent blown fuses.
Question: what is your experience or opinion of one 200ah battery to (2) 100ah battery? My application is for my 16 foot travel trailer. Going to mount 300 watt solar system with 200 watt inverter. LiTime has multi size batteries so looking at (2-3) 100ah or get the 280-300ah battery. Thanks for your demonstration.
Great video that answers a question because I just added another lifeP04 battery of the same make and 100ah to my trailer. Question (2), my new r/v trailer comes with two 70ah AGM batteries, can I incorporate lifePo4 batteries into the electrical system for of grid camping?
You actually CAN do that. Typically, it's not recommended because the LFP will, for the most part, be getting most of the charge and discharge cycles due to its slightly higher operating voltage profile...BUT in your particular scenario, especially if you're going to be in sub-freezing temps at times, combining the AGM with Lithium will give you some low-temp capacity when the LFP need to drop-out to protect themselves. So in most cases, the LFP's will serve most of your load demands and then the AGM will act as a kind of backup reserve to the LFPs. Here's a video I recently discovered on that topic: ruclips.net/video/78AL8zJmaa4/видео.htmlsi=q9sU3nyOiwshx8dm
What happens if you have a bms low voltage cut off? If you discharge them even at a normal rate the smaller cell will cause the whole system to shut down. I see if maybe you use this set up for a little while, stop, let them balance and repeat. For any real home use you will be limited by the smallest cell in the group. Or Am i missing something?
I have one of those Temgot batteries and it’s disappointing. The LCD charge level is very inaccurate and will slowly drop to 83% and then drop rapidly to 0%. Then charge it to “100%” but it isn’t really full. Completely useless display.
It's an important video. HOWEVER... Conveying important technical information is like setting up a Christmas tree. You start off with your conclusion. The bare conclusion is like a bare Christmas tree. You then present your argument and facts supporting your conclusion. This is like hanging ornaments on the tree. It allows viewers to frame your argument and facts to your conclusion in order to make sense of them. You then conclude by restating your conclusion. This reinforces everything you have said as you said it. The way you explained it in your video dilutes the importance of the information you are conveying because for 19 minutes, the viewer doesn't really know the point you are trying to make.
Part 1 was great. I didn't expect a part 2! Thanks!! 👍
Great video!
Important subject and a very good presentation, thanks! I have three 100Ah LFP and one 150Ah LFP and have added and subtracted them freely in parallel when needed and there has been no issues.
Excellent presentation. Thank you. I might have missed it in the video but it is worth mentioning the correct way to wire them to the load/charger via a diagram so that each battery gets the exact same load/charge. This honestly makes a real difference as more batteries are added to the bank.
I have a simple questions:
Whats the MAXIMN number of lifepo4 batts you can have in Parallel? Beyond the stated "4" that we see all the time.
And for laughs can they also be as we have seen different amps. 50+100+200+300+400+ etc+etc..... or any combo. How big can we go beyond 4 that's the question.
This would show how we can expand our system over time. Not everybody can buy (4) 400+ amp.batts at the same time. Count me in as one of those people.
Thanks
Very helpful. I was thinking to adding a 300 amp hr epoch to my 120 amp hr epoch battery and this answered my concerns. Thanks
FYI
The internal resistance of the battery will never change, the only thing what changes is the voltage difference between the internal battery (state of charge) versus the externally applied voltage, that drives the current going into out of a battery
Very cool demo and explanation. Thanks for making this video.
Pretty cool info. To really geek out, would have been nice to see a voltage reading at the terminals of each battery (the 100AH and 460AH) when they were first connected together. The smaller 4.3V battery vs the larger 11.9V battery, difference of 7.6V@40A (the instant they were connected) was a 304W energy transfer. Once connected they, in theory, would have been pretty similar voltage, separated only by the resistance of the cables. Wonder what the V at each battery terminal was over the first few minutes.
Off grid basement goes into the specifics you just inquired about, go check out his video on parallel of different size batteries if you're still curious, good stuff👍
Thank you for the demonstration.
Thanks for sharing 👍
Very good video sir, thank you for sharing this with us. I just finished adding a set of four 100 amp hour batteries to my current set to make my system 10,000 plus for a longer run time should the power fail. I noticed the older set discharging a bit more than the newer set. Thank you again, keep showing us, we are playing attention.
Very cool. Thank you
If u wanna measure battery resistance, you could use this meter:
YR1035 Battery Internal Resistance Test
Same chemistry, same voltage in parallel is fine even with different capacities, however I would probably use a fuse between the batteries and consider proper cable sizing for the current path.
@16:00 - The 100AH battery is delivering 37 amps and the 460AH battery is delivering 73 amps. The smaller battery represents about 18% of the total capacity, yet it's delivering almost exactly 33% of the total load. I find that curious. Less resistance from the pouch cells, which will change over time, meaning toward the end of a complete discharge cycle, the 100AH battery will be delivering well under 18%? Then I watched the rest of the video. :) Clearly, the larger battery is actually charging the smaller battery, throughout the discharge cycle. Very interesting.
Interesting. I have a Power Queen 12v 100ah group 24 bluetooth battery and am considering getting another 12v 100ah Lifepo4 battery to connect in series or parallel to add additional capacity to a power station. I was waiting until the exact same battery was on sale, but based on your findings it looks like I can purchase any other Lifepo4 12v 100ah battery even if it doesn't have bluetooth, is not a group 24, or even the same manufacturer. I'm assuming the same info applies if I decide to connect them in series to get 24v for faster charging?
There is a lot of conflicting info about this on RUclips and your video really clears it up. Thanks.
I definitely would NOT recommend this for SERIES connections, because the batteries do not automatically try to equalize their charges in Series...you'd need an add-on balancer to do that. Also, in parallel, if one battery drops out (for over-voltage or under-voltage protection, or whatever), you just lose capacity...but if a battery drops out in series, the entire bank is down.
@@ReeWrayOutdoors Great points. Thanks.
Thank you for explaining this so well.In my RV I currently have one 280ah lifepo4 from Battleborn (Love the brand but hate the price) I have asked Battleborn techs if I could buy a power queen 300ah and add it to my 12v system in the RV the increase my capacity. They said no because bms’s are different and they will not play well together. I also decided to contact Power Queen and asked the same question. They pretty much said the same thing. I did not specify whether I was wanting to run them in series or parallel. I asked these questions a year ago. From what you present it appears there would be no issues paralleling the 280ah Battleborn with a 300ah power queen. I would run each individual battery to a buss bar so that charging as well as discharging will remain fairly equal. Just wanted to ask you if I am understanding this correctly and if you see any issues in what I want to do. Thanks again. I just have 12v system in my rv.
@chuckroberson1184 yep you're understanding just fine. Series would be a concern, but parallel really should be fine.
This just happened to me yesterday. I bought a 140ah LifePo for our RV to help on our overnight stays on the interstate. After a handful of trips, I have been thinking of adding an additional 100ah maybe a mini from the same maker. I reached out to the maker and they said that it was not advisable. They recommend same same amp hour. I didn't think it would matter and it would appear in this video that it may be okay. Thanks for sharing your knowledge.
Their answer will be "yes" if your question is adding different capacity but same brand. Means sales for them.😅
@@abuxxx3607 They actually said No, not recommended. I was surprised when I saw this video that I could. Thanks for the reply.
Are those fuses connected on the negative and positive terminals of the batteries? If they are what size are they? Also if only using one battery which battery terminal do you place the fuse on, the positive or negative? As always your channel is very informative.
always fuse off the POSITIVE terminal and the fuse rating should never be more than about 20-25% of the rated current of the cable that the fuse is protecting. You can fuse lower than that for greater/faster protection, but depending on what you're powering, you might nuisance trips (if a breaker) or frequent blown fuses.
That’s not a fuse on the negative thats a shunt to measure current draw!
Question: what is your experience or opinion of one 200ah battery to (2) 100ah battery?
My application is for my 16 foot travel trailer. Going to mount 300 watt solar system with 200 watt inverter. LiTime has multi size batteries so looking at (2-3) 100ah or get the 280-300ah battery.
Thanks for your demonstration.
A single 280-300 AH is a much simpler install and less cable is required.
Great video that answers a question because I just added another lifeP04 battery of the same make and 100ah to my trailer. Question (2), my new r/v trailer comes with two 70ah AGM batteries, can I incorporate lifePo4 batteries into the electrical system for of grid camping?
You actually CAN do that. Typically, it's not recommended because the LFP will, for the most part, be getting most of the charge and discharge cycles due to its slightly higher operating voltage profile...BUT in your particular scenario, especially if you're going to be in sub-freezing temps at times, combining the AGM with Lithium will give you some low-temp capacity when the LFP need to drop-out to protect themselves. So in most cases, the LFP's will serve most of your load demands and then the AGM will act as a kind of backup reserve to the LFPs. Here's a video I recently discovered on that topic: ruclips.net/video/78AL8zJmaa4/видео.htmlsi=q9sU3nyOiwshx8dm
@@ReeWrayOutdoors Thanks for the reply, I thing it would be prudent to keep both battery set-ups independent of each other.
What happens if you have a bms low voltage cut off? If you discharge them even at a normal rate the smaller cell will cause the whole system to shut down.
I see if maybe you use this set up for a little while, stop, let them balance and repeat.
For any real home use you will be limited by the smallest cell in the group.
Or Am i missing something?
@breakthechains8362 in parallel you don't really have that issue of one dropping out and taking the whole system down like you do in series.
Can 415 led acid batteries mix with a 225 led acid batteries in parallel
I have one of those Temgot batteries and it’s disappointing. The LCD charge level is very inaccurate and will slowly drop to 83% and then drop rapidly to 0%. Then charge it to “100%” but it isn’t really full. Completely useless display.
What if I connected a 50Ah and a 100Ah lifepo4 in parallel? Can that work
It's an important video. HOWEVER... Conveying important technical information is like setting up a Christmas tree. You start off with your conclusion. The bare conclusion is like a bare Christmas tree. You then present your argument and facts supporting your conclusion. This is like hanging ornaments on the tree. It allows viewers to frame your argument and facts to your conclusion in order to make sense of them. You then conclude by restating your conclusion. This reinforces everything you have said as you said it. The way you explained it in your video dilutes the importance of the information you are conveying because for 19 minutes, the viewer doesn't really know the point you are trying to make.