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phemens's avatar
phemens
Explorer
Apr 08, 2018

Battery cut-off switch and Solar ?

I have a battery cut-off switch installed between battery bank positive distribution post (all batteries cabled to posts with equal length cables) and the main distribution block (where I have the feeds from 2 solar controllers, house main, inverter). My question is, I assume that I would need to cut off the positive feeds from the solar panels to the MPPT controllers before switching off access to the batteries?
If so, can I install same type of cut-off switches to each controller - one is wired at ~ 30 volts from a single 250w panel, the other gets ~ 90 volts from 2 x 325 panels wired in series.

11 Replies

  • Most Solar controllers I have seen the instructions on, say to disconnect the panels from controller before disconnecting controller from battery.

    I've screwed up a few times and not followed through on this, and it still works, but I assume it is cumulatively damaging to the magic smoke still contained inside the controller.

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