Sure doing it at night works. On some (all?) Atkinson controllers the green negative solar prewire is connected directly to the negative busbar instead of the controller. On a replacement controller (Victron) you need to connect the green solar prewire directly to the negative terminal on the solar controller. I would also suggest upgrading the wires going to the busbars with 6 gauge wire and adding a 40A breaker on that wire. And while your at it you could install a shut off switch on the solar prewire before the solar controller.
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2021 Northern-Lite 10-2 & F350 DRW PSD, 600W Solar/Victron/600A BattleBorn
146 nights 31,000 miles (first 10 months!)
Sold: 2018 GT27Q, 74 nights 12,777 miles
Sold: 2017 FC25FB, 316 nights 40,150 miles
Sold: 2013 Casita SD17 89 nights 16,200 miles
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