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Old 29-08-2015, 16:28   #16
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Join Date: Sep 2014
Location: puget sound washington
Boat: 1968 Islander bahama 24 hull 182
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Re: Installing one solar panel to two batteries

A battery charger also when not in use isolated the batteries by design however if you hook both batteries to the solar you would be doing it after the controller thereby connecting the batteries together all the time. You can use a charge combiner such as this
Victron Energy Cyrix-ct 12/24V-120A Battery Combiner

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Old 30-08-2015, 22:07   #17
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Join Date: Mar 2008
Location: California
Boat: Cape Dory 28
Posts: 445
Re: Installing one solar panel to two batteries

Thanks, because of your help I am now attached!

Of course, now you have to tell me how I can make sure it is charging at least one, hopefully both batteries!

Here is my plan, so you know I am at least trying to think for myself and figure this out. I am currently attached to shore power and solar.

I will turn off the shore power at the marina shore power box for my slip. During the early part of the day. Now, batteries without that good shore power immediately start to drop down in voltage. Mine float, being gel, around 13.39. So when I turn shore power off, without the solar panels being hooked up, they both drop really evenly for some reason, and after several hours they are at around 12.9.

I'm not sure what a 130 watt solar panel connected to an mppt controller, connected to two 100 ah gel batteries should put them at.

I would think at the end of the day, with no shore power, but the solar charging, if they test at above 13 that means the panels are working?

Does that make sense? Should I turn anything on to try to use some power? Or should I just see if the panel keeps them topped off?

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