I’m using a JK BMS which uses float voltage and three Multiplusses 8000VA. When the charge voltage of 55.2V is reached for an hour it will go to float voltage of 53.6V. When it does that, the inverters will discharge at maximum power and it ignores the maximum discharge power set in remote console u…

btw I have now set RCV and RFV both to 3.45V. The jk-bms 100% (after 1h “absortion time”)logic still works fine and CVL always at 55.2V. Not really a solution, but certainly temporary.

You should be able to run DESS without PV. DESS doesn’t require a PV system. Otherwise try ‘keep batteries charged’ option

First I will try (maybe tomorrow) to limit de SolarEdge (limit active power) to 10% (so max 1.7kW).

With the 55.2 voltage you just hit the balancing point. 3,45x16=55.2 Volts. I guess you also got some issues with your SOC on the JK BMS too!? I limited the charge current on 50 Amps and the voltage so it slightly ticks the 3.6Volts otherwise the rest of SOC won’t be reachable. Voltage i set is 56…

That won’t be an issue as it will remain at 55.2V for an hour so enough time to balance. 50A charge current is quite low for my system. I’m currently at 100A charge current. But al this is not a part of the issue that with DESS on it will discharge at full capacity to go to float voltage.

I think we ( @dick ) found what causes the big battery feed-in/discharge (jk-bms float mode CVL 55.2V -1h-100%-53.6V)) in DESS mode. I noticed that AC-PV & DC-PV feed-in enable/disable does nothing (PV feed-in always enabled) in DESS. Why? Maybe it would be nice to have the option to disable (AC)-PV…

I am not sure about this..If I turn DESS off and DC-PV feed-in is also off (=Feed in overvoltage → 1 = NO) then I think nothing happens when CVL 55.2V-1h-100%-53.6V. At least my system has been running for about 2 weeks without any problems. I am still new to the world of ESS & DESS.I find it confu…

[image] Ido Buiter: If I turn DESS off and DC-PV feed-in is also off (=Feed in overvoltage → 1 = NO) then I think nothing happens when CVL 55.2V-1h-100%-53.6V. At least my system has been running for about 2 weeks without any problems. Yes. Then The MP wont to try to get rid of the “overvolta…

Ignores discharge power to float voltage

Q&A and troubleshooting DESS

idobuiter (Ido Buiter) 15 June 2025 14:26 73

Could this have anything to do with it?

Apparently AC-PV feedin switch has no effect with DESS on. (switch on or off, PV always feed in)
Maybe DC-PV feed in switch also has no effect either with DESS on?

I came across this, maybe it has something to do with it

I haven’t worked with node-red yet.

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Ignores discharge power to float voltage

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