How can I prioritize export over battery charge from the PV? (ET 5kw inverter)

[lampra1]

Hi, I am wondering if I can force constant limited export to the grid while the battery is charging from the PV (i.e. SOC % is less than the target SOC).

I can enable limited export when the battery has reached the target SOC, both in General and Eco modes, but I can't see how to force (limited) export while the battery is charging from the PV (on an ET 5kw inverter).

To me, it seems that maybe a charge limit is needed for the battery (if this is available from Goodwe) coupled with the available export limit.

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Edit: This is probably an issue of priorities, that is prioritize export over battery charge
consumption -> export (with limit) -> battery charge

[SuriomarioCZ]

Hi,

I am trying to solve more or less similar thing. I have setup with sharing to places my and my family ones, but also have sometimes negative prices for selling of unshared overproduction (logically and unfortunately usually on sunny days, but I get the hint from the company, that is buying my overproduction on the times of negative prices - I don't much care about selling overproduction, as it will have long term minimal profit with negative prices, but it is mandatory to be allowed to share in my country). Usually the negative prices come after noon. I like to discharge battery before noon (doable with ecomode discharge when just calculating needed time), then start charging and sharing with limited grid export until afternoon (based on some production estimate the values could be calculated) and then fully open export to grit for sharing and positive sales of overproduction. In the middle section comes the trouble, because the charging takes all the excess power from PV. I have the ET 10kW and the battery 11kwh (on sunny day charger in 1,5-2 hours) can take all the power from my 8kWp production when charging. I could of course wait for fully charged battery and then limit export, but I would more like slower charging with sharing for longer time.

[SuriomarioCZ]

After sending my previous post I found out a solution via automation using function set parameter on battery_discharge_current and there must be something like battery_charge_current which prety much solves the issue, only needed code is to play with the allowed currents for charge/discharge to manage battery usage.

[lampra1]

@SuriomarioCZ
Could you please elaborate?
As I understand, battery_discharge_current & battery_charge_current are probably sensors provided by the BMS (depending at least on temperature and SOC).

[SuriomarioCZ]

The battery_discharge_current & battery_charge_current are limits of inverter for use with battery so in my understanding parameters of BMS not sensors, they are not visible (at least for me) on HA frontend. Base for these to setup are parameters of your battery to stay on safe side eg. I have max charge/disch. 30A/30A and recommended 20/30. You can use these also to limit the charging and discharging current of the battery, like setting in my case 3A for something bellow 1kW. You can also see these values in SolarGo app under advanced settings/battery functions setup/parameters setup (I am translating it from my local language, so might be slightly different). I am a newbie to HA but I found those to be accessible via automation action "set parameters" selecting the inverter and parameter battery_discharge_current / battery_charge_current, see attachment. At least for my inverter it is not super precise when targeting watts but workable.

Just be aware what your HW is capable of as the function comes with disclaimer.

[lampra1]

It seems to me now that battery_charge_current & battery_discharge_current are not suitable for my case.
I need constant export to the grid (say 500w) while covering the consumption and the rest for battery charging.

So this is probably an issue of priorities, that is
consumption -> export (with limit) -> battery charge