Using a generator with a Sunsynk inverter:
The generator can be connected either to the grid side or to the gen connection. When connected to the
grid input, the inverter will consider it a grid supply. However, you need to take care to do not export any
power since this could damage the generator. Therefore, you must limit your power to load only.
The nice thing about connecting the generator to the grid input is that it can be paralleled whereas the
Gen/Aux input cannot be paralleled. Also, the inverter will extract what it needs from the grid supply to
charge its batteries.
If you connect the generator to the Gen in part when there is a Gen signal, the inverter will switch 100%
of the load to the generator and then slowly step up the charging currents of the batteries. Therefore, the
generator must be able to supply both the charge current for the battery and the total load current.
The generator can be controlled via a relay, which is a set of dry contacts. The current on these contacts
is limited to 1 Amp 12v, approximately.
Below is a simple reference circuit that I used to auto-start generators on a boat. Sunsynk will release a
new OS E406 with better Gen control.
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