Solar Help from EEs and Others Please - Fiberglass RV


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Old 03-25-2014, 11:58 AM   #1
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Solar Help from EEs and Others Please

This is the diagram I've come up with for the solar system I want to put on my trailer. Any help from people who know more about this than I do is GREATLY appreciated!
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Old 03-25-2014, 01:41 PM   #2
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I'm an Other not an EE so I could well be wrong here.

From the diagram I saw at the Trimeteric site, all negative leads from the converter, inverter, and the solar controller, go to the shunt. I believe you need fuses at the battery end of positive leads for the converter, solar controller, and the battery monitor. What are you going to use as your disconnects at the solar controller?
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Old 03-25-2014, 01:52 PM   #3
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Hi Bob - I'm another other. This is so confusing, because every diagram I see has different configurations. Planning to use 60 amp breakers for the disconnects. What size fuses would you recommend for those battery end positive leads?
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Old 03-25-2014, 03:48 PM   #4
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Using that many panels you might want to research 'Blocking Diodes'. Some install them on each panel, some don't bother. I've never used them so I can't really comment much further on how well they work/don't work.

Your controller temperature sensor should be at the battery. If that's where your shunt is you're good. If it's like my ts-mppt-15 it carries no current and can be attached to positive or negative or neither and just be in the box.
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Old 03-25-2014, 03:54 PM   #5
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Thanks Drew - The drawing is pretty, but was difficult in Publisher. The sensor is at the battery (tiny dotted line to controller) - I have it at the negative, but I suppose with some sort of attachment, that would work, too.

Blocking diodes...another electrical expression I'll have to *try* to figure out. Hardware, I can understand, though.
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Old 03-25-2014, 04:11 PM   #6
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Relabel output from panels to DC first off.
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Old 03-25-2014, 04:13 PM   #7
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Just looked up blocking diodes. Seems the two reasons to use them are to compensate for cells that are blocked from shade or whatever, and as resistance to keep energy from flowing backward when the sun isn't shining.

I won't have anything on the roof but the panels and their components, so unintentional shading will be minimal, and I think the controller would cancel the problem of backward energy flow.

I also read that higher-quality panels have higher resistance, anyway, and they have bypass diodes to allow for under performance of some of the cells.
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Old 03-25-2014, 04:17 PM   #8
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Hi Brian - not sure what you mean. What/where should I relabel?
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Old 03-25-2014, 04:27 PM   #9
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Your legend shows black line as "AC neutral", red line as "AC hot". It's DC. But hey, we know what you meant.

See what you get when you show us your diagram?
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Old 03-25-2014, 04:29 PM   #10
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You're colour coding.. Or at least on my tiny screen it looks like you are using the same colour for AC as well as your your DC output from the panels.
I'm not good with the schematics but it looks to me like you are planning on being able to hook up either shore power or generator to run your big loads.. example air or microwave but running through your battery bank all the time??? .. Not sure the small battery bank could keep up with the drain even with external power hooked up
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Old 03-25-2014, 04:30 PM   #11
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Ya get so close to something, you can't see errors. That's why there are editors. Thanks Michael and Brian - probably saved me some more embarrassment :-)
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Old 03-25-2014, 04:41 PM   #12
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The best diagrams are done on paper with a black pencil and no labels.. Then everyone assumes you know what you're doing
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Old 03-25-2014, 04:41 PM   #13
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Brian - I don't think I'll ever use a generator, but I thought planning for it would be a good idea. As an ME, I'm not really good at all the electrical stuff, and don't know colors and symbols. In fact, I hid under my desk for most of the electrical courses. Have to figure out how to re-route that big drain to use only shore power for big loads, but would like to have the option to charge while on shore power.
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Old 03-25-2014, 04:42 PM   #14
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Quote:
Then everyone assumes you know what you're doing
Geezz - I know I can't fool anybody. And I have to live with the outcome, so I really want this done right!
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