Hello,
I have a single phase, grid-connected, system with MP-II, Cerbo, battery, and AC-coupled solar. Because of my time-of-use tariff for grid power I have thrown together a system that alters set-points etc in response to price data downloaded. I essentially want the system to be in three states:
1) Charging from grid
2) Discharging to avoid using grid
3) "Idle" where any excess solar is used to charge the batteries, but because the grid power is so cheap at these times, I don't want the system system to discharge during this time.
I've had success for the last few months, but today discovered a problem: my method of setting the system to the "idle" state is to set the charge point to a low SoC% and put the system in "charger only" mode. This worked absolutely fine until today when the grid was lost and, because the system was in "charger only" of course it didn't provide power to the rest of the installation. I was lucky enough to notice and remotely switch the system to "on" and it's now working fine while the grid is out. But.... what's the solution? How should I set the system into an "idle" mode so that excess solar is captured, but the batteries don't discharge?
Thanks,