Turning off PV when batteries are full?

Hello!, I am running an EG4 18K with 60kWh of lifepower4 batteries and 20 x 395w panels on the roof.
The batteries are easily filled and I have been getting "battery voltage high" alarms nearly everyday. In lieu of changing some settings on the 18K (which EG4 has offered to help me do but I have yet to coordinate with them to do so) can I just turn the PV disconnect off and let the batteries run down a bit?
Will this trigger anything on the 18K?
Thanks in advance for any help/advice.

No problem shutting off your solar arrays. In fact I’d recommend it, and keep it off until you are sure you are running with the proper settings.
Why don’t you post your settings here? You’ll get lots of advice.

Getting high battery voltage is an indication of a unbalanced battery. Not untypical for a new setup. Often the default battery charging voltage is a bit too aggressive. I would not turn off PV, instead get your charge profile setup for a lower max battery voltage such as 3.5v per cell.

DougfromdaUP said:

No problem shutting off your solar arrays. In fact I’d recommend it, and keep it off until you are sure you are running with the proper settings.
Why don’t you post your settings here? You’ll get lots of advice.

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here are screenshots from the EG4 Monitor app:

BrendanK said:

Hello!, I am running an EG4 18K with 60kWh of lifepower4 batteries and 20 x 395w panels on the roof.

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8kW (STC) of panels and 60 kWh is a fairly modest charge rate.
At first I was going to suggested reduced charge current, but the suggestion of reduced charge voltage sounds good.

60 kWh is what, 12x 5kWh server-rack batteries?
Do you have visibility into cell voltages of all? I'm wondering some batteries are getting higher than others.

How about a diagram and photo of your wiring - if fed from one end, current draw causes each battery to see different voltage.
If wired differently they can receive more uniform charging.

(but key issue is probably cell imbalance within a given battery, which is why reduced voltage helps. Symmetric wiring only helps somewhat because by distributing current evenly, they spend more time in the voltage range where balancing can occur.)

BrendanK said:

The batteries are easily filled and I have been getting "battery voltage high" alarms nearly everyday.

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Is the battery itself complaining? What is the battery voltage? What is the set point of the charging?

I would reduce the programmed charging voltage 100mV each day until the alarm stops. Possibly extend the absorption voltage time to at least a couple hours for more time to balance.

Yes the solar can be disabled... however that is not the best long term solution.

time2roll said:

Is the battery itself complaining? What is the battery voltage? What is the set point of the charging?

I would reduce the programmed charging voltage 100mV each day until the alarm stops. Possibly extend the absorption voltage time to at least a couple hours for more time to balance.

Yes the solar can be disabled... however that is not the best long term solution.

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the battery is not complaining specifically. It is in the monitor section of the app.

Well, I mean, physics turns off your solar panels once a day for you anyway, so there shouldn’t be any problem with turning them off at other times.

You probably want to get your batteries properly balanced and running closed loop with your inverter, some of these other suggestions sound like the right way to go.

BrendanK said:

the battery is not complaining specifically. It is in the monitor section of the app.

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OK I did not see any real voltage data in the app screen shots related to the error.

time2roll said:

OK I did not see any real voltage data in the app screen shots related to the error.

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the alarm doesn't actually show any voltage info...it just shows the alarm.
the screenshots were just of the settings