Mixing Battery Capacities Parallel Discharge Test 100ah & 200ah Lithium SOK & Roamer
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- Опубликовано: 1 окт 2024
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I have 250ah and 100ah in parallel, no problems so far, they disharge and charge perfectly.
I mix them all the time, no problem.
The only problem is the overall capacity is slightly reduced because of one battery charging the other. So heat from inter charging is generated
Same 😊
Very cool seeing them side by side like that for the whole curve
I connect 72Ah battery with 115Ah battery in parallel but some people saying if you will use in parallel then the battery cells may demege
You did the test pulling a rather large amount of current and continued pulling significant current during the entire test. I suspect if you pulled much less perhaps 30-40 amps total even just for a period of time like 30-50 minutes then the batteries would have a chance to equalize better and you wouldn’t see such a difference in loads. Would be nice to see this test done with about 1/4 of what you had for a load.
Good shout.. Maybe I will do this.
Thanks Chris, interesting. Retired electronics service tech, was thinking that would happen but good to see it in action.
SOK battery have higher voltage and it may try to equalize the voltage to match with Roamer. Thats the reason SOK use more amps. Thank you for the testing.
What if I put 4 lion energy 12 V 105 amp power lithium batteries with 4 more lion energy 12 V 100 amp hour phosphate batteries what will happen? Is that fine to connect them together?
A better way is to simply hook the batteries together in parallel, that way you get 1 big battery. Then pull from that with 1 set of + - cables.
Forgive my ignorance if this question doesn't make any sense, but would it have made any difference at all if the two batteries were connected through a common bus bar? What happens when you subsequently begin to charge these two batteries back up, while wired in this configuration?
Pardon my ignorance but can I have different AH lithium batteries in parallel with my RV solar.
Last year I purchased 4 new 100AH lithium to replace the AGM that came in my 5th wheel. Turns out to not be anywhere near what I need. Essentially going to go big with upgrading the entire system but for now, can I add larger AH lithiums to my 4-100AH I've got now?
Will it end up causing damage to the higher AH batteries? I've got 800W on top with the system I've got at this time.
I built some lifepo4 batteries a while back and made a bone head mistake. Long story short, at least one of my batteries degraded in capacity. But it's starting to look like not a total loss since they are parallel connected. Thanks for the video.
How much longer did the 2 batteries together last compared to the 200ah by itself .
I've got 150 and 140 different brands of AGM in series and parallel And no problems so far 🤪 But I do take apart and charge individual every 3 months. love this channel great information
Thanks for the kind words 😁. Looks like if your not pulling big amps the two batteries should be fine.
@@SolarPowerChannelwithChris six They run my home 🏡
Pl help me out, I'm upgrading my solar inverter from 1kw to 6kw. I've 1 AGM battery of 140Ah 2&half years old. Can i use three more AGM batteries of 45Ah in series with that one to use with 48v inverter?
@@talalakram7AGM needs to stay above 50% or they'll degrade quickly...you could use that config but recharging is an issue due to capacity mismatch...lead is very different to li-ion in charge n delivery
Good morning
I have 2 packs of Lifepo with the same voltage but
1 is 24 volt 1120 AH and the other is 24 volt 200AH
I would also like to put // both
I don't know if a fuse is needed between the two?
otherwise my converter is a 4000 watts to 24 volts
what do you think about implementing // the 2 packs?
busbars between the 2?
THANKS
laurent
excellent video perfect to cut through the bull you find online about mixing battery capacities some say yes some say no well this video not only explains why but shows you in real time thanks @Solar Power Channel with Chris
Glad it was helpful! Thank you for the nice comment.
Sorry but no it does not. The setup did not create a parallel connection between the two batteries. By connecting directly to the invertor with separate wires of the same gage to each battery he created a voltage drop on the big battery which caused it to lag behind. With a proper setup, both batteries would have the same voltage at all times and the big battery would supply 2/3 of the power and the smaller would supply 1/3.
@@haydenwatson7987it was a perfect parallel setup. Why do you think one battery charges the other at the end?! And no both batteries won't be exactly the same voltage because the load from the heater create different voltage drops based on the internal resistance of each battery.
@@haydenwatson7987if you had only two lithium cells in parallel. Each of them is 3Ah, but they have different internal resistance. The one with the lower internal resistance will give more current, therefore it must experience a bigger voltage drop
@@tnig You are looking at the internal resistance of the batteries as a static fixed value, but it is not. When the battery is at or below the 90%SOC range, the internal resistance is fairly constant and very low which is why the voltage does not change much from say 10%SOC to 90%SOC. Once a cell goes above about 3.45v, which is about 95%SOC, the internal resistance starts to rapidly increase which is what drives the voltage up. The battery that gets full first, will have greater resistance which will allow the current to flow to the battery that is not as full and therefore has a lower resistance.
I did a google search on this yesterday LOL thanks
Hope it helped 😁
Having done this for the first time, I don’t recommend it!
My 8 Battle Born Batteries, drain faster and charge quicker than my 4 SOK batteries. Both are 100 amp hours and have the same 12.8v. The SOKs are not a good match!
I’m also using Victron shunts on both battery banks. These are 48 V banks.
Check the size of your paralleling wires between the batteries. if the voltage of all batteries is not the same you have not used the correct wire sizes.
@@haydenwatson7987
I think part of the problem is the BMS, the Battle Born Batteries can take 100 Amps at a time charge, but the SOK can only take 50 Amps!
Would be interesting to see what happens with them as a 24v system with different Ah rating.
Boss I just stumble on your Math. Honestly you remind me why I just stop a City and Guilds Stage 3 Math and say, that's it!
What is best to buy and install ... 2x 100Ah 12V or 1x 200Ah 12V LiFePo4 battery ??
My system setup is ... 4x 150Wp 12V solar panels, 2x EpEver MPPT solar chargers (2x2 panels in parallel, because different directions) , 12 to 220V inverter of 1500w pure sinus
I don't think it really matters. I think a 200ah battery takes up less room, long as the BMS can take up to 200amps. Lot of them can now. People have two 100ah batteries mainly for sharing the amps. Less stress on the battery. In the video the Roamer battery can pull 200amps even though it's a 100ah battery. But imagine two of them. The Roamer batter in the video is larger than a normal 100ah as it's an extreme battery. It can be charged with no internal or external heating down to -40.. Only battery on the market I know which can do this.
Where's the AH meter?
On the BMS.. Bluetooth app.
I wonder what would happen if anti backflow diode installed in the smaller capacity battery to prevent current coming from the bigger battery? Is it going to be safer to parallel these batteries?
Not sure..
Sweet test
What capacity did you get?
Hello, I was not measuring capacity.. The effects of mixing capacity batteries while discharging.
Often wondered this,
So had I 😁 wanted to try it my self.
When I connect 2x 100Ah 12,8V each with a 100A BMS in parallel , why can't I power a 1700W appliance ??
Hello, you should be able to.
@Solar Power Channel with Chris , I changed to a 300Ah with 200A BMS and ... still can't start y lawnmower :-(
It has a 1700W motor but at start I see a spike going to 250A
I tried by installing a so called soft start but that didn't change anything at all.
I regular run other appliances up to 2500W without a problem (except the wires getting warm between battery and converter)
Is there a way to resolve the issue with the lawnmower , so I can use it ?
@@NeoVdV sounds like the motor is really spiking maybe on start up. I have the same issue on my hydraulic log splitter. It can trip a 2k watt inverter.
you need atleast 3 times the rated power of your motor, try with a larger surge current rated inverter
But who pulls that many amps at once for extended periods. Most users would be under 20 amps and usually easily under 10 amps. Not a real world test or realistic in any way. They would easily equalize the difference when used in real world RV setups.
Most people with an inverter will pull that many. I do in my RV. I dont have a gas hob, I use an induction hob and air frier. So yes it is real world testing.
Can you mix 2 12v 400AH lifepo4 with 8 12v 280AH lifepo4?
Yes