FoxESS Community - Owners & Installers Forum

As far as I understand, SOH is a measure of how worn out your battery is, ie the % of the installed capacity that the battery can still charge.
After 2.5 years, mine says it has lost 6 % ie SOH = 94 %.

This got me wondering :
a) is this normal ?
b) are there any charts of expected SOH over time ?
c) is using 'force charge' responsible for the decline ?

Wondering if this is a linear thing ie lose 10% installed capacity every 3 years, or if it declines at an increasing rate over time ? Trying to get an idea of how many years of life I've got left in the batteries before they no longer meet my needs ( installed capacity 16.5 kwh, need minimum 10 kwh, currently daily charged energy = 12.6 ).

My battery took a long time (just over a year) to loose 1%, then a few weeks later it lost 2% in a single night

I am not sure of all the answers to your question, as I am not sure there is a chart, and rate of lost SoH will vary from one install to another, depending on factors.

From what I can read and understand from a post from Dave Foster a while back, it seems to have an Annual loss, and I think year one tends to be the greatest, and then settles down. The BMS will also tot-up the times when the battery is under stress (high/low Temp and spending too long at 100% SoC, maybe being at 10% for too long also buggers it up)