What modbus address/command are you using to switch from charging back to discharging during the day? Do you have this functionality? I feel like you did. When the loads in your backup panel go above PV.
When I decide charge should stop, I just send the Charge "No Float" command Send the number 3 to location &H165
As long as the battery voltage is above the "Grid Support Volts" it will just start supplying the loads in the backup panel. If you also set "Grid Sell" it will do that as well, but I have grid sell blocked before about 3 or 4 pm, if I remember correctly. I didn't want to just dump the battery into running the A/C before we get to the high rate time. I may have to work on making it also not run the backup panel until 4 pm as well. Save what little we can get on bad production for the high rate time.
We had horrible production here as well on Monday and Tuesday. Finally a bit on Wed, and then good production today.
Since I don't try to predict, the system used the battery up to totally cover Monday. At 11 pm, the battery hit 51 volts and stopped running the house. I still net exported a tiny bit that day, even with only 3.9 KWHs of solar coming in. That is bad, I should have blocked using the batteries outside of the high rate, at least from the main panel. I will have to think about how to work out that logic.
Then on Tuesday morning, The battery sat at 50.87 volts all the way until the sun came up and it started charging.
But then on Wednesday it appears the tiny load of the DC charge controller pulled the battery down or something. A bit before 2 am (1:51 am), the XW-Pro started a charge cycle. The odd thing is, the voltage never fell below 50.94 volts. So was it Recharge? At least it stayed at just 5%, 7 amps, so it was not a huge power drain. But it happened when we got fair sun back. IT didn't quite top out the battery but it hit 56.90 by 4 pm, and it normally stops at 57.00 so it was very close. The 700 watts for 6 hours during the cheap rate is not that big of a deal, and I am still showing a net export for the month.
So today, the voltage only fell to 53.01 so with the good sun, it fully topped out the battery to 57 volts before noon.
But now it looks like the BougeRV DC charge controller went dumb again. It still has the historical data. The production on 11/6 makes no sense. It says it only made 850 watt hours, but then on the 7th it did 1,724 watt hours, even though we had lousy solar output. I think the Daylight savings time change may have confused it. Production from the Enphase system was still pretty weak on the 8th, but the DC system shows 3,174 watt hours, which is quite good. That is 3.17 Sun Hours for the DC system, vs just 1.96 Sun Hours from the Enphase system. Something is off. Then today, the DC system was way down, because the voltage got over the bulk charge limit so early, the DC was curtailed. I am going to send an e-mail to BougeRV. I don't want it to keep losing it's settings.