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Generally, when your getting zero volts on the point of connection at your controller it means you have reversed polarity.. Disconnect your leads and verify positive and negative are what you think they are.. Then verify your solar terminals + & -

What area are you in? Do you know what your average hours of daylight is for your location? The SMA inverters can be programmed for generator functions.. There is a setting on the Master inverter that tells the generator when to kick on and charge the batteries.. You say the batteries are full...

I’m a solar contractor here in San Diego and I have a customer that purchased one of the DC Power trailers.. Once I understand the configuration I will be able to help you expand or join together systems.. First of all I would tell you that when you add more solar you’ll need to keep it...