Solar Panel Install Ideas - Page 3 - Fiberglass RV


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Old 01-22-2013, 05:34 AM   #29
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Linda,
I have one Trojan T-1275, 12v, 150 AH deep cycle golf cart battery, which gives me about 75 amp hours to work with. It just fits (tight) into a group 27 battery box, but it is heavy, weighing in at 84#.

My major energy drains are the lighting, fridge, fans in summer, and furnace when colder. None of the energy drains are on all the time. So, you need to determine, realistically, the duty cycle (how much of the time they are actually draining the battery) for your appliances. All my lighting is LED and only used in the evening. The fridge is a Norcold DC0040, compressor type and pretty efficient. It only runs about 25% of the time. The two fans are from MaxxFan and the furnace is an Atwood 8012II, both the most efficient that I could find.

I was determined to place as much solar on the roof as the real estate would allow, 185 watts in all (one 85 watt Solartech multi-crystal and two 50 watt mono-crystal). I kept the wiring as short as possible to eliminate losses due to wire resistance. 10 gauge from the panels to the controller and 6 gauge from the controller to the battery. I used a PWM type controller, so the panels are wired in parallel. If I were to do the system over, I'd use flexible panels (similar to panels from http://www.sunflexsolarhk.com ), attached directly to the roof (without mounting hardware) and spend a bit more for a MPPT type controller and wire the panels in series.

You really cannot have too much solar. The solar controller regulates the rate of charge to the battery. The more solar you have, the faster your battery is restored. Once the battery is fully charged, the controller shifts to a maintenance (trickle) charge. So, if you top off the battery by 10 am, as Perry does, then your appliances are actually being powered by the panels for the remainder of the daylight hours, thereby extending your battery's capacity.

Ron
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Old 01-22-2013, 08:27 AM   #30
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.............I was determined to place as much solar on the roof as the real estate would allow, 185 watts in all (one 85 watt Solartech multi-crystal and two 50 watt mono-crystal). ........
Ron
This is of interest, as I was wondering exactly how well matched solar panels need to be in order to add them in parallel. I had read elsewhere that they should be more exactly matched, but perhaps that is for optimal efficiency as opposed to acceptable efficiency. Glad to hear that yours are working out.
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Old 01-22-2013, 08:51 AM   #31
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I was determined to place as much solar on the roof as the real estate would allow, 185 watts in all (one 85 watt Solartech multi-crystal and two 50 watt mono-crystal). I kept the wiring as short as possible to eliminate losses due to wire resistance. 10 gauge from the panels to the controller and 6 gauge from the controller to the battery. I used a PWM type controller, so the panels are wired in parallel. If I were to do the system over, I'd use flexible panels (similar to panels from Solar South USA, Providing the Best in Alternative/Renewable Energy ), attached directly to the roof (without mounting hardware) and spend a bit more for a MPPT type controller and wire the panels in series.
So I understand that wiring in parallel increases amps output but wiring in series increases voltage output. So why the move to series wiring scheme? Wouldn't parallel also better insulate against a situation where one panel may be partly shaded?
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Old 01-22-2013, 12:16 PM   #32
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You would wire in series to increase voltage, thus reduce the dependence on larger wire. But as mentioned you’d need an mppt controller to properly charge your batteries. In series you’d need a by-pass diode for each panel in case one is shaded. Some panels have these built in, some do not and you’d have to build it into your wiring, all depends on your gear.


Mismatched panels become bad news when they are different voltages (not watts), as everything is dragged down to the lowest voltage. This is also true for poor charge controllers, they’ll drag your panels down to battery voltage.
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Old 01-22-2013, 01:17 PM   #33
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Mismatched panels become bad news when they are different voltages (not watts), as everything is dragged down to the lowest voltage. This is also true for poor charge controllers, theyíll drag your panels down to battery voltage.
Drew what causes different voltages in solar panels? Is it the basic structure, like amorphous vs crystalline or is it common to have different numbers of cells in each panel?
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Old 01-22-2013, 02:32 PM   #34
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Each panel will have a certain number of cells, all which should be at the same voltage, which will be dependent on the manufacturing process. They are then wired in series and parallel to come up with the panels overall voltage. So for example, I have a 75w panel with 36 cells, and I have a 215w panel with 72 cells. The 75w panel is 17 volts, the 215w panel is 42 volts. You wouldnít use these two together. I bought the 215w panel to replace my 75w.


The type of cell, mono, poly, etc... will affect how large the panel is, and how it handles environmental conditions such as temperature, sun, shade... so overall efficiency.


Iím no expert, but thatís how I understand it, hope that helps!
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Old 01-22-2013, 06:04 PM   #35
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Linda,

I If I were to do the system over, I'd use flexible panels (similar to panels from Solar South USA, Providing the Best in Alternative/Renewable Energy ), attached directly to the roof (without mounting hardware) and spend a bit more for a MPPT type controller and wire the panels in series.

Ron
Thanks John and Ron for assuring me that I have no worry about Solar overdose. The flexible panels is what I've been looking at and I'm pretty convinced that is the route I will go. I don't use a lot of power, but will be running a new Fantastic Fan I just ordered, one or 2 LED lights, and my big splurge, TV to watch DVDs at night.
Ron, since you mention not skimping on the controller, do you have one you can recommend?
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Old 01-22-2013, 06:57 PM   #36
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Linda the typical Scamp TV uses little power. You should be fine.
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Old 01-22-2013, 08:23 PM   #37
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Linda the typical Scamp TV uses little power. You should be fine.
That's good to know, that is probably my biggest usage. I'll hopefully run the frige on propane, but with some solar refresh I should be good to go. I read your thread about your solar installation and intend to do the same type setup. I had planned on also installing an 80 watt flexible panel with tape and the marine gizmo you used to wire into the Scamp. But I found what looked like a great deal on a 100 watt flexible, which started me wondering. You've done a great job on your all the mods. It inspires me.
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Old 01-22-2013, 08:43 PM   #38
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100 watts is great. I could only fit 80.
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Old 01-23-2013, 07:17 AM   #39
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Linda, The only controller that I have any experience with is the one on my camper, which is a Morningstar Sunsaver Duo (PWM). I haven't had any trouble with this one. When I got it, I was looking for a multi-stage controller, one that would shift the charging rate based on what was needed by the battery, just like some of the smart battery chargers or converters. That's important because, if a high charge current is constantly applied you can damage your battery. A good charger/controller should drop the current to a trickle/maintenance charge once the battery is fully restored.

The Duo also came with a nice meter that can help you keep track of what's happening with you battery. Regardless of what brand you choose, I recommend installing some type of meter to monitor the condition of your battery.

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Old 01-23-2013, 07:49 AM   #40
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..........
Ron, since you mention not skimping on the controller, do you have one you can recommend?
Linda
I'm not Ron, but here is my $0.02. You can get a Chinese controller for less than $10 off eBay, you can get a quality PWM controller for $50-ish or you can go all out and get an MPPT controller for $200+.

My recommendation would be to go with a brand name PWM controller like Morningstar or Xantrex. Choose by the amperage (and voltage) you need, allowing some "headroom" to add another panel if you want it later without upgrading. Panels are getting cheaper everyday, so it is likely you'll upgrade when it is too cheap not to.

I like this place for panels and controllers.
Solar Cell, Solar Panel, Renewable Energy, Wind Energy, Charge Controller, Solar Trackers - Solar Cell, Solar Panel, Solar PV, Solar Products, Charge Controllers, Solar Trackers
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Old 01-23-2013, 01:23 PM   #42
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Here is one opinion. Maybe the EEs here can jump in.
WELLSEE fake MPPT controller guts - YouTube
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