As the chart below shows, all night long my batteries repeatedly charge briefly from the grid, then discharge. The pdf shows my settings and that AC charging is disabled. Why is this happening? I have an 18 KPV inverter and 2 - 280Ah indoor wall-mount batteries.
@eg4eric Obviously the battery voltage varies over the course of a day. Attached is the graph showing the battery voltage for that day.
The cut-off setting for both on-grid and off-grid was set at 48V. With AC charge NOT enabled, I expect the battery to discharge to 48V and then the load is powered by the grid until the next day when the PV power carries the load and charges the battery.
I noticed that you DISABLED the "PV Charge Priority". Why? According to the documentation, this should be ENABLED to "ensure excess PV power (after meeting load demands) is directed to charging the battery before any other action". Seems to me that this setting should be ENABLED.
Just a little history: I knew I would lose power for most of 7/22/26 so I had enabled AC charge on 7/21 so I could ensure that my batteries were fully charged. Once the batteries were charged, I disabled AC charge on the evening of 7/21/26. The system worked as expected until the evening of 7/23/26 when it started doing this inefficient AC CHARGE/DISCHARGE cycling of the batteries.
@gtsquires
I don't believe I made any changes to your system.
PV Charge Priority limits PV charge power. So, if you set it to 3kW, it will only use 3kW of PV power to charge batteries and the rest for loads.
It seems like it could be a setting that would be causing the batteries to be charging and discharging that frequently.
Are you still experiencing this?
Yes, this is still happening, but now there is a new issue. I have lost all communications with the inverter. I cannot even select a system name because there is no list. As a result I have no data of any kind right now.
Any suggestions how to restore comms? Is there a checklist somewhere on how to restore communications.?
I do have a checklist procedure for resetting the inverter so I will probably start there later this afternoon.
