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OK, even if they're 250AH, they're still only gonna be rated to 50% DoD (Depth of Discharge) for full life. Most are rated at 80% DoD MAX, but at significantly lower life. In addition, Lifepo4 have cycle lives in the 3000-5000 range, whereas AGMs are only rated for ~1K cycles MAX with most...

No it doesn't. 4D is generally 200AH, not 250... AND....only half of that is usable.. AND..... AGMs are on par, price-wise, with LiFePo4. AND.... 2x 4Ds weigh ~234lbs for 200AH usable.. AND.... 2x Lifepo4 weigh ~48lbs for 200AH usable.. AND...Lifepo4 can recharge quicker..

Who said anything about battleborn? They're overpriced. Right now, LifePo4 batteries are going for less than $300 for 12V@100AH, 200AH 24VDC rack mounts with all the bells and whistles are going for ~$1200 --- https://www.amazon.com/dp/B094NN5KWY ^^ $240 - $12 coupon = $228 Can support up to...

I ran through all this years ago. Keep it 24V - You can charge from the alternator. Skip the DIY liFepo4 - commercial systems are dirt cheap these days. Whether you go rackmount or decided to series/parallel 12V batteries, the minimal cost savings doing it yourself isn't worth it. Get a 24V...