If you have solar. I could use some help. - Page 2 - Fiberglass RV


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Old 06-10-2012, 11:31 AM   #15
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Hey Kevin ... I just picked up the same panel on eBay for $115 ... how come everyone finds a better deal!? They are all pretty much the same and all ship from pretty much the same part of California. Definitely from China, but they have operations here in the U.S. It arrives in a couple of days and I will try it out immediately since we leave next week for Yosemite for a week of off-grid camping with Play Pac #2. I got the 10 amp controller as well. The whole system is modeled after the one on Play Pac #1 (which will be up for sale shortly!). The P.O. was a whiz at solar and it is such a huge plus to have it. Only difference is we went from a 40w to the 50w that you are looking at. Exact same specs. I'll let you know what I think of it at first flash.
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Old 06-10-2012, 12:18 PM   #16
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These are a little better until you read the fine print. They will be happy to write "sample" on the box to help beat the customs charge, that is, if the panel is less than $100.

80Watt Flexible Solar Panel Battery Charger for boat caravan RV solar camper | eBay
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Old 06-10-2012, 12:23 PM   #17
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Paul Chet
Keep me posted.
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Old 06-13-2012, 02:35 PM   #18
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If you have a portable solar panel, how long is your cable and what size?
size 14-2
size 12-2
size 10-2
Going to buy 50 watt solar panel and 10 amp controller.

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Old 06-13-2012, 03:08 PM   #19
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Be sure to mount the controller next to the battery as opposed to the solar panel.
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Old 06-13-2012, 04:12 PM   #20
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Seat of the pants that looks like it would put about 17 ah back into your battery per day. Is this enough based on what you think you will use?

I use ((1 x amp output) * 4 hrs) + ((.5 x amp output) * 4 hrs) to ballpark it, found that someplace and it seemed reasonable. 4hrs of full power and 4hrs of 1/2 power.

If you could swing another $100 you could bump that charging capacity to around 29 ah a day with a single 48" panel. Or add another later, whatever works.

Agree with the idea of 10amp charge controller better to have some extra capacity, never know you might get a deal on a second panel someplace and time in the future.
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Old 06-13-2012, 04:50 PM   #21
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50 watt $95. shipped 2.89 amp
100 watt $179 shipped 5.75 amp
Might go with the 100 watt
Still need to know avg cable length everyone use and cable wire size for
50 watt
100 watt
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Old 06-13-2012, 05:25 PM   #22
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Quote:
Originally Posted by Kevin K View Post
50 watt $95. shipped 2.89 amp
100 watt $179 shipped 5.75 amp
Might go with the 100 watt
Still need to know avg cable length everyone use and cable wire size for
50 watt
100 watt
Do you have a link for that 100 watt panel? That is better than the price I found on Amazon for an 80 watt.
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Old 06-13-2012, 05:29 PM   #23
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At full sun w/50 watt panel I assumed 3A. current.
Your voltage loss for 20 ft (double wire) of 18ga copper wire is 3/4v. For 16 ga the loss is 1/2 volt, and 14 ga is about 1/3 volt. Everything is linear so if you go to 100 watt you will double the current and double the resulting loss. If you halve the wire length you halve the loss. I would use 16 ga for the 50 watt and 14ga for the 100 watt. As long as you keep the polarities strait, hardware store lamp cord will work or even an old extension cord. Raz
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Old 06-13-2012, 06:13 PM   #24
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Link for 100 watt solar WSolar 100 Watt Solar Panel 12V UL | eBay
Link for Controller Amazon.com: HQRP Solar 10A Charge Power Controller / Regulator 12V / 24V 10 Amp with LED Indicator plus HQRP UV Chain / UV Radiation Health Tester: Patio, Lawn & Garden
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Old 06-13-2012, 06:13 PM   #25
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I looked at it a little differently than Raz, looking at wattage wasted as heat.

For the 50 watt with 50' wires you waste about 2 watts in heat with 14 gauge, 1.3 watts for 12 gauge and 0.84 watts for 10 gauge.

This assumes I calculated it right. I used the formula that Power = Amps (squared) times resistance. I looked up the resistance of copper wire on line.

As Raz noted, it is all linear so a 100 watt panel doubles this, a shorter wire set halves it, etc.
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Old 06-13-2012, 07:44 PM   #26
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I have the controller at the panel and 10 ft of cable that connects to the battery. I calculated with 20 ft of cable to be conservative. Fifty feet seems a tad distant but maybe I am missing something.
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Old 06-13-2012, 08:24 PM   #27
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I don't mean to highjack this thread, but does anyone know how large a panel etc. I would need to run something like this ? Whynter 45 Quart Portable Fridge / Freezer - Sierra Expeditions
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Old 06-13-2012, 09:24 PM   #28
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power

This may give you a feel for the requirements and it depends on how much sun you get and the amp draw on the cooler. But I Just got back from the outer Banks of NC. Stayed for 6 nights at Ocracoke NPS campground (no electricity)and ran my ARB 50 Qt (which is supposed to be a little more efficient) as a freezer as an experiment on 150 watts of solar. Never got below 60% on my battery monitor which was checking on 2 T605 210 Amp hr Trojans in series. one day was cloudy all day, two were full sun and the rest were Partly Cloudy . Had Movie night 2 evenings when I was pulling about 6 Amp Hr for 2 hours. I suspect running as a fridge will use less and Movie night is a drag on the batteries with the inverter and all running.
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