Low-low power inverter with zero export function

[ET92]

I just set up my new solar system (on-grid) with a 50 V LiFePO4 battery.

Here’s my issue: my inverter (Goodwe) consumes around 60-70W even at night, just to power the house’s idle load of about 10W. And there’s no setting like “turn off if consumption is below X watts.”

So, I was thinking of using a small inverter (initially thought about repurposing a microinverter with custom zero-export reading the existing 485 meter) to power my house at night (max 200W consumption). Is there anything ready-made for this?

My plan was to handle the switching myself with an ESP32—turn one inverter on, turn the other off. I know microinverters have a really low operating consumption, around 7-10W.

Yeah, I get that this is a “small” optimization, but in winter, 60W * 12h of darkness = 1kWh. In summer, it doesn’t really matter, of course.

Any ideas?

 

[ET92]

The ideal solution for me would be a Victron Inverter VE.Direct 48V 500W. But if I understand correctly, it cannot read a power meter and therefore cannot limit the power output accordingly, right? It's designed to be off-grid... I haven't found any other inverters made to be connected directly to a battery that consume around 9-10W... Does anyone know of any?