Help a newbie

[s79junk]

Hi,

i boldy used your project on my fresh Sungrow SH8.0rt with attached BYD-HVS Battery.
Knowing nothing about modbus and holding registers (? i guess im on the way) I must admit i thought this are all read-only sensors until i found and played with these sliders in the homeassistant dashboard.
Concret I was happy to find "Set reserved SoC for backup" because this is what i searched do not find via isolarcloud or WiNet-S.
Unfortunatly since then the battery felt to do not charge the same way as before and at least the dashboard of iSolarcloud behave confusing. (toggling between charging and not charging).
Diving into what i have done, it seems to me that all this parameters only defines the limits of an forced charge/discharge?
Is there any kind of mode change i initiated with the first use of a slider or am i just confused because of bad weather?

Is there a good description what all these holding parameters do and what would be an recommended setting for a SH8.0rt?

Kind regards,
Stefan

[mkaiser]

Hi,

please check these two parameters:

They set the threshold value for battery involvement. I recomment values between 100W and 250W: Battery starts charging, If more than 100W 'spare' power is available. If less than 100W, the spare power is exported and battery is not charged. (Same thoughts for discharging)

Setting both values to 0 or near 0 (e.g. 10W) , the battery will heavily toggle between charging / discharging if PV power and load power have similar values

[s79junk]

Danke! Ich übernehme das erst mal und schaue mir das Verhalten an.

[s79junk]

What is the source of these max values (5000) for set_sg_forced_charge_discharge_power, set_sg_battery_max_charge_power and set_sg_battery_max_discharge_power? Can i match these according to my inverter/battery documentation or is there any technical modbus register limit below int16?
(To lift this initial 0W start charging/discharging values did help btw.)

[dylan09]

I think it is from the Sungrow Modbus register documentation for register 13052. But the documentation states that for the SHXXRT inverters the register is "0-100% of BDC rated power". But they also need the power in this register.

Maybe you could try to set the maximum allowed value for the input_number to the maximum possible for your battery.

[s79junk]

The sensor battery charging power in homeassistant fast confirms the use of a higher limit (i tried 5500) but the creepy "Live-Daten" in isolarcloud app sticks with 5,007kW for several minutes. I put it back because battery will be full anyway, but i would like to know what the factory setting was. Where i find this register documentation?

[dylan09]

Search for the following document: Communication.Protocol.of.Residential.Hybrid.Inverter_V1.0.23_EN
10.4 Communication Protocol_String Inverter_V1.1.36_EN.pdf

Maybe there is a newer version available. A lot of helpful information could be found in the german Photovoltaik Forum (www.photovoltaikforum.com). Another helpful source is the iobroker forum.