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post #1 of 11 Old 09-02-2012 Thread Starter
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Sailnet - critique my solar project.

Hi All,

Can people provide a critique of my wiring diagram here for my solar panel project.


S/V Jendai
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post #2 of 11 Old 09-02-2012 Thread Starter
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Re: Sailnet - critique my solar project.

Those big arrow things are my best representation fo beneteau's proprietary system for battery bank selection. In real life, they look like this:


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post #3 of 11 Old 09-03-2012
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Re: Sailnet - critique my solar project.

Why use a breaker in between the charge controller and the panel?
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post #4 of 11 Old 09-03-2012 Thread Starter
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Re: Sailnet - critique my solar project.

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Originally Posted by hellosailor View Post
Why use a breaker in between the charge controller and the panel?
I've thought about eliminating it. Its there to prevent a massive amount of current going into the batteries and frying the battery switch. I dunno, how are most people wiring their solar?

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post #5 of 11 Old 09-03-2012
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Re: Sailnet - critique my solar project.

My solar goes right to the house bank with the right size FUSE to protect that section of wire the solar control should not be able to damage the battery's

The alternator output goes to the same-place and they behave together just fine


The Bluesea ACR gives the extra to the cranking battery

The Bluesea 5191 Terminal Fuse Blocks keep the battery's and the boat safe

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Last edited by tommays; 09-03-2012 at 07:26 PM.
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post #6 of 11 Old 09-03-2012
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Re: Sailnet - critique my solar project.

Breakers or fuses are there to protect the wire in a short circuit situation. There should be a breaker or fuse in the positive wire between the controller and the battery, close to the battery post. There is no need for a breaker or fuse between the panel and the controller.
The threat in a short circuit is from the batteries, not the panel.

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Re: Sailnet - critique my solar project.

As mitiempo says.

"Its there to prevent a massive amount of current going into the batteries "

Where's that massive current going to come from? Can't come from anyplace besides the batteries, the output from the panels is self-limiting and if they short out, power can't get to the batteries from them anyway. Same same battery primary fuse that is there to isolate the batteries from eveyrthing else, should be upstream of the solar connections as well.
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post #8 of 11 Old 09-05-2012 Thread Starter
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Re: Sailnet - critique my solar project.

Ok, so remove the second breaker and go with fuses? Is that the general consensus? What about size of fuses? I'm thinking 10 amp inline?

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Re: Sailnet - critique my solar project.

I would use fuses. As I said I don't believe they are necessary between the panel and the controller. You want the fuse to be sized larger than the expected maximum current but below the wire's ampacity. You are probably using 10 awg or larger wiring for minimal loss. 10 awg has an ampacity of 51 amps in engine spaces and 60 outside engine spaces. As long as the fuse is a bit larger than the max current you're good to go.

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post #10 of 11 Old 09-05-2012 Thread Starter
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Re: Sailnet - critique my solar project.

Yes, using 10 AWG wire. The panel is rated at 215 watts at 26 volts. Peak amperage would be 8 amps at that point. So a 10 amp fuse the right thing to use?

Also the reason I wanted a breaker was to be able to control the panels output for diagnosing things downstream. Is that reason enough or stick with the fuse?

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