Fox ESS Evo 10 parasitic drain?

basketballboy · Sat Dec 20, 2025 6:22 pm

Hi guys,

Just had my Fox ESS Evo 10 installed yesterday, I have set it to not charge or discharge at all until I get my EV Tarrif (Have no solar, just a battery system to take advantage of cheap night rates..)

I noticed it drained from 61% to 55% over night (7 hours ) and indeed it shows on the fox app and and the inbuilt display a discharge of around 80 watts continuously.

Is this a normal amount of parasitic usage for the battery to drain when it's doing nothing?, or should I be looking at configuration / setup or firmware update to help lower?

I have the 5kw inverter for reference.

Thanks

Sat Dec 20, 2025 6:35 pm

Sounds like the inverter is still running even with limited load so you’re seeing the worst case system losses or battery warming maybe?

Once the system is commissioned check back in should you need any help.

basketballboy · Sat Dec 20, 2025 6:52 pm

Will wrote: ↑Sat Dec 20, 2025 6:35 pm Sounds like the inverter is still running even with limited load so you’re seeing the worst case system losses or battery warming maybe?

Once the system is commissioned check back in should you need any help.

Thanks very much - it has bene setup and is in use, if that is what you mean by commissioned?

Would love to understand what is using that 80 wats an hour, and if i can do anything to decrease it.

Many thanks.