Hello.
I am experiencing an issue at the end of day or during dark days, where the PV can not deliver any substantial energy to the battery:
Rough setup:
8x80W PV panels (4s2p), approx 80V idle Voltage,
controlled by a SmartSolar 100-20 and connected to a
Bluetti power station on the charger input, where the Bluetti box requires a certain voltage (58.5v) to close a protection relay.
Works like a charm, until the day is dark or it gets dark, then the Voltage from the mppt falls below the Voltage required by the Bluetty power stations charge input, and the relay opens (to protect the battery), and while the relay is open, the voltage on the mppt output climbs again, relay reconnects: Click (connect), clack (disconnect) - this goes on forever on a very dark/rainy/cloudy day, or until it’s almost dark at the end of the day.
This is on one side very annoying since in this off grid setup the Bluetti box is close and I have to listen to this relay clicking, and I am sure these unnecessary cycles of the relay are not beneficial for long service live.
On the Bluetti power station I can not do any settings.
Question is:
Can I somehow tell the SmartSolar charger to stop charging, if there is no (not enough) energy at the panels, or is there any other solution/idea to stop this ongoing cycling of the relay?
I could (and can) temporarily disable charging trough Victron connect, but then I have to remember to activate again at the proper time, or I will not get any charging on the next day (or whenever there is enough light outside)…
In this tiny setup I really am little interested to add a cerbo and node red or something in this matter. Great for larger systems, but not in this use case described here. Needs to remain as simple as possible…
Looking forward to any suggestion. Thanks for reading!