FoxESS Community - Owners & Installers Forum

Hi there,

I've had my unit for 6 months and 10 days and it's currently sat at 108 cycles.

Now we've reached a time of year in the UK where the sun disappears quicker, I'm using most if not all of my battery each day.

I was under the impression that my DoD on the EVO was 5% , but yesterday it reached a minimum of 5%, cut out as expected, and then continued to lose another 2% dropping to 3% during the evening until it was charged again at cheap rate around 2 hours later.

Is this normal? Surely it should keep to it's DoD?

Second question:

Our installation was completed on 10th April 26 and our SoH has now today ticked down to 99%. I'm a little concerned this is premature but I realise it's degradation isn't linear. What have others experienced? Are my two observations linked? Is my usage pattern perhaps degrading the battery before I should expect it?

This is the first drop in SoH so I'm a tad bit worried...

Thanks

For part one, your BMS will probably be calibrating itself. A video from Will that will go into more depth https://www.youtube.com/watch?v=8LG1Jm5eWSs My EP11 has 10% minimum, but it can drop below, just like yours has.

For part two, my SoH sat at 100% longer than others, but then seems to have rocketed down to 93%. IIRC Dave Foster has mentioned that year 1 can see the bigger drop, then it settles down to a more linear wear rate.

Thank you for your reply, it's put my mind at rest a bit. I'll keep an eye on it.