Hi there,
I have a DC coupled system:
2x 150/70 Smart Solar MPPT
1x MP 48/5000/50-70 II
15kWh LFP (Polarium).
7.2kW PV array.
ESS and DVCC are active.
There is some anomalous behaviour, when the grid max feed-in rate is reached (~4200w), excess PV power is dumped into the battery beyond the absorption/float voltage, causing overcharging of the battery.
I understand the MPPTs are externally controlled by the Multi, and go to maximum power when controlled by ESS feed-in, but it seems like an oversight for the Multi to allow the MPPTs to dump excess PV into the Batteries when the feed-in is at it's maximum rate?
I understand I can throttle the MPPTs manually using max charge limit to stop this behaviour, but that wastes PV potential when I have to charge the battery and have AC loads also.
Am I doing something wrong here?
Advice much appreciated.