simpliphi PHI 3.8 LFP battery upgrade

[Wheelestate]

Hi all, I'm thinking about upgrading my 48v battery bank (4 12v AGM 100ah in series) to just one of these PHI 3.8
I need about 1KwH of energy to run stuff at night. My current battery bank can bearly cut it + I'm concerned about
DOD ruining it. The specs say the PHI 3.8 has 3.04KwH @ 80% DOD and 3.8KwH @ 100% DOD. Does that mean I
can only pull out 3.8-3.04 = .76KwH of juice to stay in warranty? Does anyone have experience with this battery?

https://simpliphipower.com/product/phi-3-8-battery/

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Partially off-grid 48v system. Spartan Automatic transfer switch. 1500w Samlex inverter.
(9) 265w array with 3 (3 panel circuits) to a EPEVER 60amp MPPT charge controller.

[Mike90250]

Well, something is not right, and best to troubleshoot it before you spend $$ on Li batteries
here's a screen shot of my simple comparisons , and your 4, 100ah batteries should
have about 4,000 watt hours in them.
And it's hard to beat a bank of golf cart batteries, which is what I'd suggest as a debug step, or simply replacing your
failing AGM's with flooded group 24 or 27's to diagnose what the issue is before you destroy a expensive Li bank.

battery compare.jpg

[SunEagle]

I agree with Mike. Your battery bank should easily provide you 1kWh a day. If it doesn't then I would say it is not getting back to 100% SOC which could mean the bank is getting old or you do not have enough pv wattage/charging amps to do the trick.

If you need to replace your batteries I would first look into FLA type before you go to Li type.