FoxESS Community - Owners & Installers Forum

I have read that to keep a healthy lithium ion battery, it should be charged between 20 and 80%. I have a fox ecs2900 with a fox inverter and solar panels.
There appears to be no restriction when charging the battery from the solar panels - if there is enough light, then it will be charged to 100%. Also, the invertor allows for forced charging to 100% from the grid.
Is it ok for battery health to always charge to 100% whenever possible?

Lithium ion (Li-ion) is different to Lithium Iron Phosphate (LifePo4 aka LFP), your batteries are LFP and you will get the best out of the if you make sure that you do a 100% charge at least once a month (or your SoC accuracy will drift), and also set your minSoC to 10%. The batteries are warrantied for 90% depth of discharge (100%-10%) so best to use them as the manufacturer intended.

Thanks for the reply. Yes I understand the need to charge to 100% about once a month. But for daily charging is it OK to set soc to 100% or is it better at 80/90?

I charge mine to 100% daily, and don't worry one bit.

Most batteries don't like being "stuck" at 100% SoC for a long time, but at home this typically doesn't occur for very long before the power is used. So provided you don't charge and hold your battery at 100% SoC for DAYS, without any discharge you will be ok.

The cells will typically withstand 4000 or 6000 cycles before they have degraded to about 80% of their original capacity, at one charge/discharge per day, that's about 11 years / 16.5 years! By this time, the battery pack should have been more than paid for itself, and you can replace it with something from the future, with hopefully better capacity and cheaper (hopefully)