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CharlieM
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Topic: Connecting a 100 watt solar panel to Zamp port Posted: 07 Jun 2016 at 6:24pm |
No flames here. Just cool specs. The specs on the SS-20L-12V only allow a max solar voltage of 30V. Most solar chargers have a max input to output delta limit. The open circuit voltage of a 12V panel is typically ~18V so two in series would be 36V. You are correct that series panels require smaller wire due to lower current, but the controller has to be designed for that. An MPPT controller will allow that higher input, but the SS 20 L will not.
All that said, there is an advantage to parallel connection. If one panel is shaded or partially shaded it's output will drastically drop. In a parallel connection that will only affect one panel. In a series connection it will affect the whole array. On the other hand, in low light conditions the series connection will produce more usable power, but only with an MPPT controller. Which is best? As they say "It depends".
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Charlie
Northern Colorado
OLD: 2013 RP-172, 2010 Honda Pilot 3.5L 4WD
PRESENT: 2014 Camplite 21RBS, 2013 Supercharged Tacoma 4L V6 4WD
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johnmaci
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Posted: 07 Jun 2016 at 5:50pm |
Originally posted by CharlieM
Originally posted by Don Halas
I hope to mount a Morningstar SS 20L 12V SunSaver 20 amp 12 volt Solar Charge Controller with LVD controller inside the battery box. It's a little over sized for the one panel, but I believe allows me the option of adding the second panel in series with the first panel.
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With a 12V battery the maximum panel input is 25V. A second panel should be connected in parallel, not series.
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OK, so without flaming me :).....I read somewhere that it is preferable to connect two panels (or more) in series since a higher voltage and lower amperage can use a lighter gauge wire, and less loss of power over a greater length of cable?
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CharlieM
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Posted: 07 Jun 2016 at 4:33pm |
Originally posted by Don Halas
I hope to mount a Morningstar SS 20L 12V SunSaver 20 amp 12 volt Solar Charge Controller with LVD controller inside the battery box. It's a little over sized for the one panel, but I believe allows me the option of adding the second panel in series with the first panel.
| With a 12V battery the maximum panel input is 25V. A second panel should be connected in parallel, not series.
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Charlie
Northern Colorado
OLD: 2013 RP-172, 2010 Honda Pilot 3.5L 4WD
PRESENT: 2014 Camplite 21RBS, 2013 Supercharged Tacoma 4L V6 4WD
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JandL
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Posted: 07 Jun 2016 at 4:07pm |
The reason I pick the Grape Solar for warranty information is because Renogy has discontinued there flexible panel. The Hqst panel only has a 1 year warranty
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JandL
2013 Honda Ridgeline
2012 177
2 Paynes in a Pod
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Rustler
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Location: S. Oregon Coast
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Posted: 07 Jun 2016 at 3:36pm |
Originally posted by Don Halas
I'm close to pulling the trigger on this. First I've got to see if my current battery box has enough extra space to accommodate the charge controller mounted inside.
I'm planning on mounting one HQST 100 Watt 12 Volt Monocrystalline Flexible Solar Panel to the roof on the toe side of the Pod. If my approach works I may add a second panel on the rear side at a later date. (http://www.amazon.com/dp/B017OMTAV6/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=1OFFIBLM4EPOJ&coliid=I180JN9A4WMLPF&psc=1). I'm going to run the wire down the front of the pod directly into the battery box and not use the zamp port on the back. I plan on attaching the panel using 1/2" VHB tape and then using Dicor sealant around the entire panel. Wires will be secured using wire cable clips that I hope will be adequately mounted using command strips. If the command strips fail it shouldn't be a big deal to find a suitable alternative.
I hope to mount a Morningstar SS 20L 12V SunSaver 20 amp 12 volt Solar Charge Controller with LVD controller inside the battery box. It's a little over sized for the one panel, but I believe allows me the option of adding the second panel in series with the first panel. It's supposed to be good for exterior applications. (http://www.amazon.com/dp/B017OA5DH8/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=1OFFIBLM4EPOJ&coliid=I18UBPLNOQR164)
I'm guessing a 20 amp fuse between the charger and battery should suffice.
Any thoughts or guidance will, as always be appreciated.
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The following link has more than you want to know about solar systems and the National Electric Code.
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Russ
2009 Toyota RAV4
V6 w/ tow package
2016 Rpod 171 HRE
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CharlieM
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Posted: 07 Jun 2016 at 3:33pm |
Originally posted by Don Halas
So that's why this is either simple, self sustaining and no more hassle or not happening.
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As a general philosophy I like that approach.
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Charlie
Northern Colorado
OLD: 2013 RP-172, 2010 Honda Pilot 3.5L 4WD
PRESENT: 2014 Camplite 21RBS, 2013 Supercharged Tacoma 4L V6 4WD
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Don Halas
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Posted: 07 Jun 2016 at 3:27pm |
This is a nice to have for me, rather than a got to have.
We don't have a lot of dry camping planned. The exception will be occasional boondocking and perhaps when my son gets me in music festivals.
My primary reason for this is to not have to drag the extension cords across my driveway while the Pod sits there most of the time. Putting the first panel on the front is strategic since that will be Southern exposure when it's parked in my driveway.
A secondary purpose will be if we are using battery that we might not to be so concerned with it.
So that's why this is either simple, self sustaining and no more hassle or not happening.
Again, thanks for your feedback.
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WillThrill
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Posted: 07 Jun 2016 at 3:20pm |
Originally posted by JandL
The warranty on my Grape Solar GS-STAR-100W is 10 years, 25 years on > 80% power output and 10 years on >90% power output. There flexible panel PhotoFlex-100W warranty is 2 years, 2 years on 80% power output. That's why I went with the rigid glass covered panel |
That kind of thing is by no means universal in the industry. Renogy warranties their flexible panels for 25 years at 80% efficiency.
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"Not all those who wander are lost." Tolkien
2014 Hood River 177
2005 GMC Envoy XL
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JandL
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Location: California
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Posted: 07 Jun 2016 at 2:23pm |
The warranty on my Grape Solar GS-STAR-100W is 10 years, 25 years on > 80% power output and 10 years on >90% power output. There flexible panel PhotoFlex-100W warranty is 2 years, 2 years on 80% power output. That's why I went with the rigid glass covered panel
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JandL
2013 Honda Ridgeline
2012 177
2 Paynes in a Pod
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WillThrill
Senior Member
Joined: 04 Jul 2014
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Posts: 298
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Posted: 07 Jun 2016 at 1:54pm |
Originally posted by Don Halas
I'm close to pulling the trigger on this. First I've got to see if my current battery box has enough extra space to accommodate the charge controller mounted inside.
I'm planning on mounting one HQST 100 Watt 12 Volt Monocrystalline Flexible Solar Panel to the roof on the toe side of the Pod. If my approach works I may add a second panel on the rear side at a later date. (http://www.amazon.com/dp/B017OMTAV6/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=1OFFIBLM4EPOJ&coliid=I180JN9A4WMLPF&psc=1). I'm going to run the wire down the front of the pod directly into the battery box and not use the zamp port on the back. I plan on attaching the panel using 1/2" VHB tape and then using Dicor sealant around the entire panel. Wires will be secured using wire cable clips that I hope will be adequately mounted using command strips. If the command strips fail it shouldn't be a big deal to find a suitable alternative.
I hope to mount a Morningstar SS 20L 12V SunSaver 20 amp 12 volt Solar Charge Controller with LVD controller inside the battery box. It's a little over sized for the one panel, but I believe allows me the option of adding the second panel in series with the first panel. It's supposed to be good for exterior applications. (http://www.amazon.com/dp/B017OA5DH8/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=1OFFIBLM4EPOJ&coliid=I18UBPLNOQR164)
I'm guessing a 20 amp fuse between the charger and battery should suffice.
Any thoughts or guidance will, as always be appreciated.
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You are correct in that a 20 amp charge controller is overkill for one panel. A 100 watt panel will, at most, output 8.33 amps (100 watts / 12 volts) of current, and it will likely be less than that because the voltage output of the panels will be closer to 18 volts, so the amperage will be even less. Also, bendable panels will almost always output less than that of rigid panels because they cannot be angled perfectly to the sun like rigid panels can.
In the OP, I used a 10 amp Sunforce charge controller that has worked perfectly for me, but I understand that in your situation, you want something that is more tolerant of bad weather. Just be aware that a 20 amp controller is unnecessary for one panel. If you're wanting to add another panel, then go ahead and get the 20 amp controller.
And yes, bendable solar panels were made to be exposed to sunshine, so they'll be fine. The biggest drawback I see with mounting solar panels to your Pod is that you must be parked in the sunshine for them to work. We try to avoid this at all costs in order to keep our Pod cool, but I understand that you don't want to pull out a rigid panel when you want to recharge your batteries. I personally don't mind it.
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"Not all those who wander are lost." Tolkien
2014 Hood River 177
2005 GMC Envoy XL
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