Hello,
In my system it is possible to disconnect the battery from the MPPT 75/10 whilst the solar panels are connected. From looking at other threads I think this is forbidden. It is clear in the manual that battery then solar panel should be connected when configuring the system. What will happen if I disconnect the battery? Will the voltage at the BATT terminals be the same as on the PV terminals?
I could connect a relay to the battery followed by the diode and use the contact of the relay in series with the panel so that the panel is only connected to the MPPT when the battery is connected. However this will always put a load (the relay coil) on the battery which is undesirable! A semiconductor relay is too expensive.
Thanks
John
