PV Surplus charging question

[JakobTewes]

Hey everyone,

I followed the PV Surplus config manual: https://github.com/marq24/ha-goecharger-api2/blob/main/docs/PVSURPLUS.md

Now my car is charged dynamically. I configured all three values "pgrid", "ppv" and "pakku".

Can someone explain, how things work with these attributes? Asking cause i wanted to only charge with solar power, but the wallbox also used up battery storage:

This is the sensor.goe_123456_pvopt_averagepgrid:

And this is my battery drain curve:

And the consumption from utility:

To me the curve looks a bit "hysterical" and not certain what i did wrong to assure, only solar generated energy is used.

Maybe someone got a hint :-)

Thanks and regards

Jakob

[JakobTewes]

Asked claude....states:

go-e Charger: PV-Only Surplus Charging Configuration

The go-e Charger uses three values to calculate available surplus power:

Field	Description
pgrid	Grid power (positive = drawing from grid, negative = feeding in)
ppv	Current PV generation in W
pakku	Battery power (positive = discharging, negative = charging)

The Problem

If you populate pakku with the actual battery value, the go-e Charger includes battery discharge power in its surplus calculation — meaning it will draw from the battery to charge your car, even if that's not intended.

The Solution

Always set pakku to 0 (or omit the field entirely).

This way, the charger only sees PV generation minus grid draw as available surplus — the battery is excluded from the calculation.

Correct Configuration for PV-Only Charging

Field	Value
pgrid	Current grid power in W (e.g. +150 = drawing, -300 = feeding in)
ppv	Current PV generation in W
pakku	Always 0

Home Assistant

In your HA automation or REST call to the go-e Charger, hardcode pakku=0 regardless of the actual battery state. This prevents the charger from factoring in battery power when calculating the available PV surplus.

[JakobTewes]

....unfortunately not true ;-). Raised a ticket with go-e to clarify field usage and their usage. Will be coming back