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Solar panel charge controllers


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I've got a 100w solar panel with a dual mppt controller, this has been fine for 2 batteries, but I've recently added a third

Can 2 controllers (I can't find any that have 3 battery outputs, only dual) be connected to one panel and will this be enough to keep 3 batteries topped up (110 ah start and 2 x 90ah house)

Or should I just get another kit and use 1 panel for starting and 1 for house batteries ?

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If you’ve got the 2x house wired in parallel no need, jusr set them up as 2 batteries.

If you have 2 separate house supplies you’ll need another controller or use a split charge system for one house and start battery. 

Edited by Odyssey
Was talking rubbish first time 🤣
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That's what I have

Originally I had 1 house and 1 starter, added a third and wired it in parralel with the house

I want to be able to separate the house batteries from each other, just in case one goes bad and brings the other down with it

So can another controller be wired in to the existing panel ?

Edited by jonnyswamp
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Not really unless you’ve got some kind of isolation switch to split them from being in parallel.

then you can use another controller from your panel to do the work but I’d be tempted to fit another panel and controller dedicated for your starter, then use the current dual output controller to charge your 2 house batteries but make sure you’ve got an isolation switch to isolate them from each other 🙂 (a 1-2-combine would work)

Edited by Odyssey
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