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augie1955 · 08-03-2021, 04:03 PM

Saw this video on building a nice drop in LiFePo4 12V Battery.

https://youtu.be/VgtZ0L4uLgs

DirtRider · 08-03-2021, 08:59 PM

Quote:

Originally Posted by augie1955

Saw this video on building a nice drop in LiFePo4 12V Battery.

https://youtu.be/VgtZ0L4uLgs

Hmmm. My not-quite-finished setup is obviously far more complicated than it needs to be...

Thanks for posting!

Pappion · 08-03-2021, 09:13 PM

I built one. The 280AH failed to show, so I used 200AH. I used Overkill Solar BMS. It has high and low temp cutoff. Very good blue tooth app too. I wonder where he got that box from? I used an off the shelf battery box which was large enough for 280AH, but had to use padding for thinner 200AH. Just cut up some yoga blocks, very firm. I think his padding is to tight and the BMS will overheat. I have more room and lid openings, also don't plan on max current {no inverter).

Best forum for DIY batteries:
https://diysolarforum.com/

nvs4602 · 08-03-2021, 09:53 PM

Quote:

Originally Posted by Pappion

I built one. The 280AH failed to show, so I used 200AH. I used Overkill Solar BMS. It has high and low temp cutoff. Very good blue tooth app too. I wonder where he got that box from? I used an off the shelf battery box which was large enough for 280AH, but had to use padding for thinner 200AH. Just cut up some yoga blocks, very firm. I think his padding is to tight and the BMS will overheat. I have more room and lid openings, also don't plan on max current {no inverter).

Best forum for DIY batteries:
https://diysolarforum.com/

Do you have a link for the battery box that holds the 280ah. I'm waiting on my cells now. Should be here any day. I hope

Pappion · 08-03-2021, 10:51 PM

Quote:

Originally Posted by nvs4602

Do you have a link for the battery box that holds the 280ah. I'm waiting on my cells now. Should be here any day. I hope

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I have heater pads and a temperature controller too. It's summer so no rush. Might move the batteries into an old cooler.

D Gardiner · 08-03-2021, 11:38 PM

Good video. Nice build.
Going to order some 310AH lifepo4 cells soon myself.

augie1955 · 08-04-2021, 09:38 AM

Quote:

Originally Posted by nvs4602

Do you have a link for the battery box that holds the 280ah. I'm waiting on my cells now. Should be here any day. I hope

In the video there is a link below.

Here it is if you can't find it

https://solarsupplyhouse.com/product...ismatic-cells/

Uniblab · 08-13-2021, 10:20 PM

I am building my own also, but I'm not putting it in a box, I'm building it directly into my Class-C using 16 200AH prismatic cells and 2x120AH BMS from BatteryHookup. Cost was about $1,600.

So far I've top-balanced and compressed the batteries, and figured out where I'm going to mount them. Fortunately I found a spot inside the living area that could accomodate all of the cells together in a single row. It is underneath the refrigerator - had to build a 3" platform to raise the batteries up over some copper pipes that were running through the floor (low point drain). Had to lose one drawer (no big deal) and will have to enlarge the hole under the fridge (also no problem, I will fab a panel to cover it).

Overall, I'm pleased. The LiFePo4 battery weighs 160lbs and will replace 240lbs of AGM batteries, so I'm shedding 80lbs but gaining a lot of capacity. The cells will be configured in 2P4S2P configuration for 800 amp-hours at 12V. I don't really have any loads that require this much power yet, but I have a Pioneer 12KBTU mini-split on order that I am hoping to install, and at that point I hope to be able to support limited amounts of off-grid A/C. There is already 900W of solar on the roof and I am going to add a couple more panels if this all works out.