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…

You can have DVCC enabled and at the same time you can select “No BMS control”. The sytem will than use the Voltage, Current, SOC, Temperature from the BMS but will not listen to the Charge Voltage Limit (CVL), Charge Current Limit (CCL) and Discharge Current Limit (DCL) from the BMS.

[image] Raphael_Hofmann: ed and at the same time you can select “No BMS control”. The sytem will than use the Voltage, Current, SOC, Temperature from the BMS but will not listen to the Charge Voltage Limit (CVL), Charge Current Limit (CCL) and Discharge Current Limit (DCL) from the BMS. That …

I recommend to switch on DVCC. Than you have one point of truth that all the devices can use and Voltage drop over the cables does not matter that much. But you can play around and figure out, what works best for your system. Read the documentation: 11. DVCC - Distributed Voltage and Cur…

@RGroothuis @k3ivi @Raphael_Hofmann Can we please stay on-topic, otherwise this post is flodded with other topics. Just open a new topic if you have questions about something else not related to this topic, thanks.

Agreed @darryl12123 I hope my video was an added value to this discussion?

CCL=0 will not work for a Victron system. If JK had requested the BMS specification from Victron before implementing, they would have seen this. Victron recommends controlling on voltage. A good charging algorithm keeps the CCL above 0.25 * the battery capacity (in Ah) at all times during normal…

[image] warwick: A good charging algorithm keeps the CCL above 0.25 * the battery capacity (in Ah) at all times during normal operation. JK does not control current. And it does control voltage. Bonus is that even if BMS controlled CCL, it is being ingored when export to grid is enabled.

Hi, Yes, the Pylontechs are 15s, and “there” Victron is overriding the CVL of the battery (53.x) with 52.4 max as you noted. (That is outlined in the battery compatibility guide, to prevent frequent overvoltage alerts happening otherwise) That the charge Voltage is raised, when feedin is enabled, …

That the charge Voltage is raised, when feedin is enabled, is “normal” - Otherwise the battery could not be hold at 100%. If battery and MPPTs would run at the same voltage, the multis would draw power from both, when trying to feedin. That would be acceptable, but Victron is still moving with th…

The Voltage Up/Down is not by design. My System (2 MPPT, MPPT RS and Pylontech) is not doing that - at least not at the values your graphs show. There are a lot of users using BMS Like the JK with no Issues as well. I think you should consider it’s an hardware issue, that may cause this. It could b…

Ignores discharge power to float voltage

Q&A and troubleshooting DESS

k3ivi 8 September 2025 17:22 109

There is a current flowing. And by logic of DC coupling it makes sense, if Victron raises voltage on DC bus → power flows where it can and it flows to a battery which still accepts power.

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Ignores discharge power to float voltage

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