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Old 07-06-2015, 14:56   #1
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Battery Isolator for MPPT solar charger

Hello,
Hooked up a solar array to a MPPT solar charger and it worked great for my house bank but my start battery was not getting topped off. So....copying my Balmar alt I added a batt isolator to split the charge wire to both banks and keep them isotated from each other. When I hooked it up the battery voltage from both banks averaged out on the volt meter and then the solar controller turned itself off. When I direct wire the controller to one bank or the other it works fine and charges that battery bank. What did I do wrong?
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Old 07-06-2015, 16:06   #2
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Re: Battery Isolator for MPPT solar charger

Quote:
Originally Posted by rossny View Post
Hello,
Hooked up a solar array to a MPPT solar charger and it worked great for my house bank but my start battery was not getting topped off. So....copying my Balmar alt I added a batt isolator to split the charge wire to both banks and keep them isotated from each other. When I hooked it up the battery voltage from both banks averaged out on the volt meter and then the solar controller turned itself off. When I direct wire the controller to one bank or the other it works fine and charges that battery bank. What did I do wrong?
You can't use diode isolators with solar controllers because the controller is looking for an "turn on voltage" and it can't see a voltage on the input stud..

Use a battery combiner/ACR (voltage sensitive relay) instead. If it is just for a start battery you could also use an Echo Charger or Balmar Duo Charger. Not much good about diode isolators.......
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Old 08-06-2015, 10:16   #3
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Re: Battery Isolator for MPPT solar charger

Thank you Maine...I thought it might be something like that. Must be getting warmer up there, enjoy.

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