Seplos BMS

I assume Seplos should get to 100% no warnings then just standby waiting to discharge

mine has discharged fine @garo more than once after hitting 100% - might be limited for a few minutes but it does discharge - so is it a grid tied inverter related issue so? I thought from memory Growatt was well tested by Seplos so I’m surprised. If left does the Growatt inverter start to error?

Interesting so your stuck in limbo that’s very strange - does it stay stuck on standby? so not the same issue as my concern is the inverter bombs out - if it didn’t I’d be fine - so the “intermittent… warning is standard functionality so maybe the export settings on the Solis might help

Have you seen others with 100% issues? Outside of Ireland? Are Seplos still investigating your issue?

for me inverter bombs out (not pleasant) then all comes back online so no grid or nothing - the bomb out recovers and all seems fine - presumably it would continue in this cycle if I didn’t discharge

If you want to resolve issues, don't leave the problem to someone else. Engage with Seplos directly.

Sorry if it appeared that way. I have indeed sent them details and will see what happens.

How about the solis guys try this to stop the battery from going to 100% by using the python modbus script?

if(soc >= 98)
  modbus.write_holding_register(register_addr=43141, value=0) # Set charge current to 0A
else
  modbus.write_holding_register(register_addr=43141, value=500) # Set charge current to 50A

Not sure if it will work in practice but in theory it should.

Bit of a hacky way to do it and it shouldn't be needed but could be a temp fix.

Talked to seplos reseller and he reckons been using his with Solis for over a year without issues. Uses goodwe as the inverter make in the can menu of seplos as most similar to Solis. But he isn't sure what battery he has selected in Solis. Said he'd check when home tonight.

Can anyone with seplos and Solis try selecting goodwe as inverter and aobo as battery. SEPLOS agent reckons that he has this combination working perfectly for over 12 months with no errors

Just had a look there Chris.

No Goodwe option to select on my Seplos. Growatt, Pylon, Victron, Sofar or Luxpower

Thanks for update. So your HMI version was updated. Looks like 34 had some bug. The interesting part is that your battery protocol is LG where as my is GCL. Now it could be because my inverter is 4G, but since the protocol is LG it could be that your inverter would also take LG as battery for seplos?

Tried LG and Sofar but Inverter errors out straight away. Haven't tried other combos as going to focus on trying to configure the Sofar/AoBo combo and see where I get to unless anyone needs another combo tried and I'm happy to check here

I'm making progress with my Solis/Seplos combo

Couple of Pics in case they give anyone some ideas.

LCD Screen in 3d Printed Case

BMS on Plywood shelf on top of old blanket box that holds the batteries underneath, note I did not need to extend the BMS cables doing it this way so saved some work there.

And again with other plywood in place

I have an issue I wanted to see if anyone else encountered.

BMS and Inverter are communicating but I am getting an erratic SOC. I had top balanced my batteries and the BMS showed them as almost fully charged. However when I connected them to the inverter they started to discharge briefly and then the SOC dropped immediately to 10% and gave a warning and the inverter started to charge. I detached the battery on the inverter as I wasn't sure if they could be inadvertently overcharged with the SOC all over the place.

When attached to inverter and briefly discharging.

and then drops and inverter starts charging

sorry for all the detail but should I let the inverter charge until cutoff or take a different approach here if anyone has had the same issue?