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Old 11-12-2009, 00:20   #1
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Fusing Solar?

I am currently putting a couple of 10W solar cells onto Boracay to trickle charge the batteries and I know I need fuses/circuit breakers. I just don't know how big, what type and where they go.

Solar Cell 1 is to charge the start battery. This battery also runs the electric automatic bilge pump.

Solar cell 2 is to charge the house batteries (currently 2 x 220 amp. hour 6V Trojans, but may expand up to 10 x 220 amp. hour 6V Trojans). Long term I'm planning to add a few large panels up to a maximum of (say) 300W. This circuit will probably run the fridge/freezer (Danfos 35? with 6" of foam) and may also have to accept power from a wind generator.

I'm also curious about the diodes. I got two from the chandler, seem to work fine, just wonder about voltage drop (0.2V currently) and whether the battery voltage can "back flow" at all. (I put them in backwards and found voltage differences of 4V and 6V when connected across the 10W solar cell)
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Old 11-12-2009, 02:03   #2
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Chris, I think you will find all panels come with diodes installed in the cute lil black box.
Jaycar sell car fuse things that clip in loine. Miine cost about $5 I think.

Mniie are now up and working! Yippee!
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Old 11-12-2009, 04:14   #3
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El Cheapo...

My panels were cheap and small. I looked, no diodes.

For the start battery I think I can get away with an inline 5 or 10 amp fuse close to the battery, but I suspect I'll need something more serious near the house batteries.
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Old 11-12-2009, 04:36   #4
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A 10 Watt panel is going to make little impression on keeping 220 amp-hour batteries charged. And if there are no diodes, you'll lose more overnight than you gain during the day.

Simple in-line fuses should do, but fit diodes too. For a 10 Watt panel a 1 amp fuse would be enough. Current = Watts divided by volts, ie 10/12= 0.833 amps.

5 amp fuses will be plenty.
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