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Post by tattoo on Sept 10, 2018 21:35:04 GMT
I'm curious.. ^^^ I've seen you say many times you don't need fuses with small systems but now you say they do... Have you read something recently that says differently?
Just wondering?
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Post by bupkis on Sept 10, 2018 22:57:38 GMT
What I've said and linked in the past many times is that panel to controller fusing is not needed with 2 strings or less, the links I previously posted explained it well with examples. The math was simple. Panel info from the sticker on back. here it is again, note it is about AMPS and not volts as some have suggested on this forum! www.civicsolar.com/support/installer/articles/when-fuse-when-not-fuseFor disconnect purposes, disconnecting the panels first, pulling a fuse may be easier than unscrewing a screw. Note, if fusing is needed, each string is fused separately and then as a group. www.windynation.com/jzv/inf/how-properly-fuse-solar-pv-system
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Post by tattoo on Sept 10, 2018 23:24:37 GMT
Yes that's what you've said and that's why I thought you meant small systems... That makes sense,
I've always thought it was a good thing to have fuses for just that reason.... But I wasn't 100% sure why not on a small system... Now I understand...
Thanks for clearing that up...
By the way Those are some really nice blade fuse links...
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Post by bupkis on Sept 11, 2018 0:08:16 GMT
I don't know what small is, your 2 strings do not need to be fused panel to controller.
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Post by tattoo on Sept 11, 2018 1:09:27 GMT
I don't know what small is, your 2 strings do not need to be fused panel to controller. I think one or two panels is a small system.... So one panel should be fused but not 8? I mainly did it just in case it was hit by lightening...
Now I am confused...
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Post by tattoo on Sept 11, 2018 1:30:56 GMT
Ok I think I understand now....
You weren't saying that he should use a fuse you just posted a link to a fuse holder just in case he wanted to use one......
Got ya, Am I right?
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Post by bupkis on Sept 11, 2018 1:56:21 GMT
One panel is one string and does not need to be fused. This is the OPs situation, fuse if ya like. Use as disconnect. 4 panels in series is one string and does not need to be fused. 2 strings of 4 panels is 2 stings """""""""""""""
3 strings (one or more panels/string), each string is fused and the combination of all three is fused.
small, that is not what I've said or linked!
"does not need to be fused" = fusing does nothing!
fuse controller to panel, it actually has a function if a short happens.
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Post by tattoo on Sept 11, 2018 2:25:54 GMT
One panel is one string and does not need to be fused. This is the OPs situation, fuse if ya like. Use as disconnect. 4 panels in series is one string and does not need to be fused. 2 strings of 4 panels is 2 stings """"""""""""""" 3 strings (one or more panels/string), each string is fused and the combination of all three is fused. Ok now I understand.... Your link to a fuse holder through me off....
He doesn't need a fuse like I said....
Cool...
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Post by bupkis on Sept 11, 2018 11:54:38 GMT
he does on the controller to batt side !!! and could not find one with 10g wire
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Post by bupkis on Sept 11, 2018 12:49:49 GMT
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Post by tattoo on Sept 11, 2018 13:23:51 GMT
Yep, I see now he asked about both....
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jebjr
Solar Newcomer
Posts: 6
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Post by jebjr on Sept 11, 2018 15:38:28 GMT
Sounds good, I will order a 10 gauge fuse holder and install it on the '+' cable inbetween the controller and battery.
Thanks!
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jebjr
Solar Newcomer
Posts: 6
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Post by jebjr on Sept 11, 2018 22:31:15 GMT
When my trailer is parked at home and the solar panels are not hooked-up/folded and put away should I disconnect the (-) cable of the controller from the battery?
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Post by bupkis on Sept 11, 2018 23:15:46 GMT
Only if they are fully charged, AGMs have minimal self discharge so disconnecting them and they should be good for several months if they were fully charged.
Another option is to fully charge, disconnect from trailer and let the solar be a maintainer.
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