FoxESS Community - Owners & Installers Forum

Hi there,

I have H3-15.0 Smart inverter for my 3 phase home and it's drawing 250W at any given moment. It's paired with EQ4800-L9 battery and 13 Jinko panels. Based on the datasheet for the inverter it should only be drawing 20-25W as per the standby consumption data point. Am I misunderstanding something or is something off? Could panels or the battery be drawing this much? I have checked that this consumption happens both when it's generating solar and when it doesn't.

Thank you

Where are you measuring the 250 watts, is it from grid ?

It says it directly on the inverter screen (Power 250W). But also through the mobile app as "Load" after switching all circuit breakers to rule out that anything in my household is drawing that.

ok thanks, all inverters do have a parasitical loss - these are the losses involved in maintaining their operation which is worse when there is no PV as that normally covers those losses first. These losses are usually 'added' to the load calculation but in essence it accounts for the power to maintain grid syncronisation, power the inverters electronics, dataloggers, meters, even the battery management system and batteries have operational losses (communications, contactors etc..) and it takes into account things like conversion losses i.e. battery DC volts to AC volts.

The smaller single phase inverters start around 50 watts drain going up to around 150 watts on the largest single phase.

On 3 phase inverters i've regularly heard of 200 watt losses and so assuming you have no other loads being presented it would seem reasonable that this is the typical operational loss of your system.

This power drain is usually taken from the batteries (and PV when present) but at night with dynamically changing loads you sometimes see a small amount of power being taken from the grid. If you are seeing this there is a parameter setting called meter compensation which allows you to set the bias point to compensate for this drain (I believe H3 users set this to ~ -150 watts).

Thank you so much for the write up! That makes a lot of sense. I thought that it would have been already accounted for in the data sheet under Standby consumption but I guess it depends on the full setup. Yes I do see some constant drain from the grid (around 20-40W). I don't believe I have access to set meter compensation setting - I presume that only installers can do it from their interface.

Zdend wrote: ↑Sat Jan 31, 2026 10:13 am Thank you so much for the write up! That makes a lot of sense. I thought that it would have been already accounted for in the data sheet under Standby consumption but I guess it depends on the full setup. Yes I do see some constant drain from the grid (around 20-40W). I don't believe I have access to set meter compensation setting - I presume that only installers can do it from their interface.

Yes it is only an installer setting but can only really be set when you have some running history for the system, it looks like your grid use is quite low so setting it to (minus) -40w should remove that as much as possible.

Awesome, I'll talk to the installer and give it a try.