Setup:
As soon as i activate "Feed-in-Excess" the charge current of DVCC is completly ignored and over 50A are sent to the battery. Even worse: When the battery is full, the loading continues..
How can I configure Feed-in-Excess correcly?
Screenshot 1: Max. current is ignored
Screenshot 2: Settings ESS
Thanks a lot for any help,
Timo
Today I've realized I'm hitting the same issue. My BMZ battery is at 100%, the max charge current reported by BMS is 0A, DC feed in is active and was simply pushing 1 kW into the battery without exporting anything at all. I was watching it if it is just a spike which is going to be corrected but it was charging battery for several minutes without any change. I had to set the Grid Setpoint to negative value to get something exported and not charge the battery over the limits.
My setup is EasySolar-II GX + 2x MultiPlus-II 3000/48 in a 3-phase configuration running on fw v494, GX running on v2.92, MPPTs at v1.61.
Not sure if it is safe to upgrade MultiPluses to v500 now which is the only update available except for a release candidate v3.00~15 for GX which is probably still buggy.
PS: I read https://community.victronenergy.com/questions/106290/bug-in-ess-dc-feed-in-enabled-charge-current-limit.html, but can simply not understand it.. Why is it suddenly not critical to go over 50A load charge, when "DC-Coupled PV Feed -in-excess)" is activated? This basically ignores the CCL from the battery parameters.
If there is no solution I will probably write a small program, which changes the ess set point dynamically:
Not happy about it, but probably safter than ignoring battery limits, right?
Thanks @Alexandra - I still don't fully understand it, as the situation is imo technically unnecessary while the battery isn't full. The excess power (over the max charge current) could be easily put into the MP2 inverter.
But they should be ignored on MPPT side. It should not be ignored on MultiPlus side which should still respect the max charge current reported by BMS and use everything else for AC power generation no matter if all of that is used by loads.
DVCC is the system the bms uses for system control, so the battery limit is ignored by the whole system during feedback as described in the manual.
If you need less charge from the inverter set it lower in the inverter. Or use the charge current control assistant to have it activate on certain conditions.
Well, I'll probably go the way of disabling DC feed-in and use my OpenHAB automation engine to adjust the Grid setpoint to negative values based on current battery power when the SoC is close to 100%. Otherwise if CCL is not respected it could damage the battery in cases when the battery is close to freezing temperatures. It is probably not usual situation in ESS systems at home, but mine is placed in a cabin with no heating outside of the house so it can get quite low overthere, although it shouldn't go below 5°C.
Temperature settings are adhered to as well as voltage and others. It is just during feedback the ccl cannot otherwise how to the power producing items produce power? They have to ignore the battery sending the stop producing signal to produce power to feedback. Cant really have both.
Yeah, but you can use some of the produced power to be sent to the grid if you are reaching max allowed power going to the battery. You don't have to limit the production on MPPT side, you can increase the power used by inverters to limit the power going to the battery.
