JITA 12V 100Ah LiFePO4 Battery 12.8V Lithium Battery, Built-in 100Amp BMS, 20000+ Deep Cycle,1280W Power Output for Trolling Motor,RV, Solar Power System, Marine, Home Energy Storage and Off Grid

I bought 8 of these batteries to provide 20kWh of battery backup for my 4kW off-grid 48V system. The batteries are paired in parallel, with 4 pairs in series to provide 48V nominal. I did several capacity tests, using Hall sensors and current shunts. (I also used a Kill-a-Watt device, between my inverter and appliance, but this does not take into account the power consumed by the inverter. I am using a Growatt inverter which consumes about 40W-50W.) Here are the positives:• The batteries provided 100% of the rated capacity (a little over 20kWh for 8 batteries).• They look and feel new and high quality.• Customer service (via Amazon messages) was very responsive.The only negative I can report is that the batteries are not well matched. Ordinarily, when you buy lots of LiFePo4 batteries, you need to buy them from the same manufacturer and the same batch, especially if you have to group them in series for 24V or 48V systems. If they are not well matched, then one battery will charge or drain faster than the others, and it will limit the capacity of the entire system. The way I fixed this was by pairing a lower capacity battery with a higher capacity battery in parallel, so that each of my 4 pairs had about the same capacity, and then I put those 4 pairs in series. Also, if you put batteries in series, you’ll need to balance them (either top or bottom balance… look on YouTube), but this is true for any lithium batteries. I now have an excellent battery backup system the provides 100% rated capacity. If I were paying $1000-1500 per battery, I would give these 4/5 stars because of the slight mismatch in capacity. But at less than $700 per battery, they are an excellent value and I give them 5+ stars.

First, a couple of thoughts. Lithium batteries that have the same amp hour rating as a lead acid battery actually deliver twice the time in use that a lead acid battery does. Also, a golf cart draws either 56 or 75 amps, depending on whether it is 48 or 36 volt. So, a lead acid battery with a 100 AH rating will run a 56 Amp (48 volt) golf cart for about 50 minutes. A 100 AH Lithium battery will run the same golf cart 100 minutes. The reason is lead acid voltage drops as the current is drawn while a Lithium stays at pretty much a constant voltage. So, if you hook the batteries up correctly to get your 48 volts ( 4 batteries connected in series which means positive to negative to positive to negative to positive to negative, everything will work just fine.In my case, I was powering up a motorhome. What I had before was 8 100AH lead acid batteries connected in parallel which provided me with 800AH or 400 AH of usable battery. I replaced that with two 300 AH Lithium batteries which took up less space, weighs considerably less and yet gave me 600 AH of usable power instead of the 400 that I had before!!I have now used it several times boondocking and they work great. I have a 4000 Watt pure sine wave inverter so I can run the entire motorhome for several days without having to run the generator. Nice!!!!I had to change my older charge controller which does not allow for no float voltage that a Lithium battery uses, but after that, all I had to do was set the controller for lithium batteries and the charge is taken care of. If you have a newer rig, you should already have that setting available. Check with your charge controller manufacturer if you are not sure.The batteries work perfectly and I am very happy with them. I would highly recommend them. The manufacturer has a ways to go getting relevant information out on charge requirements, but that is all easily available from general web sites covering Lithium batteries.

The price on this battery is less than some of half the capacity. That does not mean it is short on features. In fact, it has some that are lacking in other batteries. First off, it states in the instructions that this battery has a built-in heating mat that will allow for charging and use in low temperatures. It will use some power if needed, but still, it beats not having power.Construction is pretty typical. I already had everything in place to charge and monitor this battery as it was an upgrade to the 100AH battery I had previously installed. Of course, it is larger so I had to build a place suitable for it. Once that was done, I connected it and the battery started charging. It took a bit to figure out how to reset the monitor so that it would recognize the capacity of the battery and recognize when it was fully charged. More about that below. It is now set and is available to power the new RV AC/DC refrigerator I installed to replace the old 3-way gas/AC/DC refrigerator that failed.The one thing I did find to be a problem was the instructions. They are a bit unclear. The instructions say that to help calibrate the BMS, one should do a "deep discharge." However, a "deep discharge" is not defined anywhere. I tried contacting the manufacturer, but the answer I got was just as vague. I ended up doing a discharge to 55% or about 110 AH remaining. It seems to have worked since my monitor seems to be reading accurately. However, that is not enough to deduct a star. The battery will be getting a real test this coming week when we make our first post-installation trip with it. I'm looking forward to seeing how it performs and how long it will last while we are at a campground with no power available.