solis inverter max charge SOC unchanging

ac3tylene

Heya

I have a soliscloud inverter and a pure drive battery.

I have tried several times to reduce the max charge SOC from 100% to 90% but even though I get a success message it remains at 100. Has anyone else seen this behaviour?

Thanks in advance

tomwilson

I contacted Solis tech support recently about this function in the inverter control settings on the app (only appeared a couple of months ago), as I also wanted to limit max charge SOC to ~80% (especially in summer months to avoid battery sitting at 100% for long periods of the day) but they confirmed this function does not work for my model of inverter (S5-EH1-P5K-L) - despite the app confirming the command being issued successfully (value remains at 100%). They also confirmed the function would disappear in a future update of the Solis app for my inverter (function is not available at all on the Solis Inverter LCD screen menu), although it's still there in the app at present (still not working). Hope this helps.

bullit_dodger

No (real) problem with LiFePo batteries sitting for a few hours at 100%. Lithium yeah, but LiFePo not really. You should be good to go to 100%. I'd avoid dropping below 5-10%, but →100% isn't generally an issue.

tomwilson

Yeah I figured it wasn't a major issue to sit at 100% with LiFePO4 battery (Dyness DL5.0C). However it could sometimes sit there at 100% from 8am to 6pm (on sunny summer days especially) as I have set battery to charge up using grid before 8am on off peak electric to maximise grid export during day and make sure I get through peak hours on solar/battery on less sunny days. However, was hoping to limit max SOC to 80-90% (in summer months) to be prudent with battery. Have left max discharge at default 20%.

graememk

https://www.boards.ie/discussion/comment/122709754#Comment_122709754

That's perfectly fine for LFP batteries.

Tradnuts

Sorry for bringing up this old thread.

This is exactly my experice today too. Set the SOC to 80%, gert a confirmation message, but it doesnt change battery behaviour. But for me is not so much a concern about sitting at 100%, its more like i dont need the battery to charge to 100% for 8-9 months of the year, its excessive. Its a 15kwh dyness, so i dont need that much for this 8-9 months as the PV takes care of everything until 6pm.

It would be much better to limit the battery to 70-80% and start exporting back to the grid for my FIT much sooner in the day.

my inverter is a RHI-6K-48ES-5G

Is there another solution i wonder?

I suppose i could disconnect on the the batteries for a while, but that seems like a less than perfect way to achieve it.

mjatkey

https://www.boards.ie/discussion/comment/123207861#Comment_123207861

Hi, then set the inverter to Feed in Priority Mode that way the battery will never get charged from the panels but only from the grid (if you set up a charge window (if you are on some sort of EV rate)).

Could flip it back to Self use once you want to charge it again if you aren't on a TOU plan.

Handy enough to do with Home Assistant or even on the APP or Solis Cloud.

Or even if the BMS has access via APP or PC and see if you can change the SOC there so it "tells" inverter when its full.