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Old 07-09-2016, 12:53 PM   #11
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Wife and I are about to begin new ventures as we ready to purchase a class-c Sprinter, lease our home, and drive into a year of travel as we search for a new homestead. While we feel confident about our class-c MB Sprinter decision, we have not yet decided which make. We are persuaded toward a 2016/17 single slide unit with the diner, closet, and queen bed on the port side. However, I wish to add a few things to the motorhome which I believe will greatly enhance our boondocking comfort. While most of the things I wish to add are quiet simple, three items concern me because of available space or necessary coach modification, these are: 1) 300 watts roof-mount photo-voltaic, 2) whole-house reverse osmosis for freshwater, and 3) shore AC power surge protection.

In this thread, I would like to focus on the photo-voltaic solar panels, and leave the other two topics to another thread. I have already calculated my average daily power consumption and have concluded that 300 watts with a MPPT controller will generally satisfy my daily energy recharge rate on a weekly schedule (already compensated for a flat panel roof-mount with seasonal variation). I am, however, concerned about available roof real estate for two solar panels on a class-c Sprinters. Has anyone here accomplished such installations with ideas and experience about how I should proceed?
We haven't only because we don't lije to put holes in rhe roof. The one on my Lance didn't belp noticeably.
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Old 07-10-2016, 06:22 PM   #12
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We haven't only because we don't lije to put holes in rhe roof. The one on my Lance didn't belp noticeably.
Greetings I Simpson. Yeah, the idea of adding a few holes also concerns me. But yet, the manufacturer already put a lot of holes in the roof for various vents and AC. Those holes seem quite secure, although I suppose periodic inspection is wise. It seems, at least to my inexperienced neophyte mind, that we should also be able treat any new holes with the same technique the manufacturer used but this idea also seems like I might be poking the dragon, so-to-speak.
I have watched several videos where folks simply glue the mounting brackets to the top of the roof membrane. Although they seem to use a suitable high-strength adhesive, this technique, without some kind of mechanical attachment (screws) into roof struts or some other framing, causes me serious concern.
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Old 07-11-2016, 04:11 PM   #13
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I bought the flexible 100 w panels. They are frameless . I attached to roof using industrial strength Velcro all around. Hug the roof tightly and I think I would need a crow bar to remove
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Old 07-11-2016, 08:50 PM   #14
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I bought the flexible 100 w panels. They are frameless . I attached to roof using industrial strength Velcro all around. Hug the roof tightly and I think I would need a crow bar to remove
That is an interesting idea! It gets rid of a lot weight and wind resistance. Have you notice an thermal issues with panel performance or with causing roof hot-spots?
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Old 07-12-2016, 12:02 AM   #15
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Panels work great. Very flat on roof. They are 100w panels and I could easily fit 2 more, but I find these work fine. (I have 2) mine are renology panels but there are others. Smaller than framed panels. I didn't want to drill my roof . The 2 inch industrial Velcro all the way around was probably overkill but didn't want to take a chance of loosing them, plus keeps wind from getting underneath panels.
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Old 07-12-2016, 06:59 PM   #16
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Where did some of you get your solar system from? Model #'s and the like?
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Old 07-12-2016, 07:29 PM   #17
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I bought mine from renology
100w flex able panels
They sold me all the parts to
Connect to my controller
I bought a mppt 30 amp controller
From Amazon , although better ones available , it was cheap and seems to work well. I also got all the wire and connectors from renology . They are the ones that recommended the 2 inch industrial strength Velcro to attach the panels to the roof. Very easy to install
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Old 09-18-2016, 08:52 AM   #18
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I have a 2015 Prism. added 250 watt panel. Works great (over a year). Also a Trik-L-Charger to allow the solar to keep my MBS battery charged.

FYI- we decided against the slide with the bed in it. We are often in areas we may not be able to extend the slide... sleeping can become a problem. We have the corner queen and the slide (with the closet/dinette in it). Can fully operate without slide out... However, way more oom when it is
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Old 09-18-2016, 06:16 PM   #19
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I have a 2015 Prism. added 250 watt panel. Works great (over a year). Also a Trik-L-Charger to allow the solar to keep my MBS battery charged.

FYI- we decided against the slide with the bed in it. We are often in areas we may not be able to extend the slide... sleeping can become a problem. We have the corner queen and the slide (with the closet/dinette in it). Can fully operate without slide out... However, way more oom when it is
Greetings MarsMan ... We just got the Prism 2150LE and completed a 3-week 3,600 mile shakedown. We finally decided on the corner-bed/single slide for the same reasons you stated. Roof space is very limited so it seems I will need to settle on 200 watts total solar. As we learned during our shakedown, 200-watt supply should serve us well as our electrical use seems much than originally estimated.
By the way ... how did you attach your solar panels to your roof?
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Old 09-18-2016, 07:19 PM   #20
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Greetings MarsMan ... We just got the Prism 2150LE and completed a 3-week 3,600 mile shakedown. We finally decided on the corner-bed/single slide for the same reasons you stated. Roof space is very limited so it seems I will need to settle on 200 watts total solar. As we learned during our shakedown, 200-watt supply should serve us well as our electrical use seems much than originally estimated.
By the way ... how did you attach your solar panels to your roof?
Nice choice... I stand corrected. My panel is 200W and not 250W. I forgot I wanted a 250 and could not find the real estate to install. I contatcted Coachmen and asked for the roof structure drawings for my 24J. I was able to use selftapping screws to hold down one edge of the panel. I also dicored the crap out of it. The other edge I used expanding screwed (used in drywall and again dicored the crap out of it. On the leading edge I placed a deflector (small plastic tube) to keep wind from flowing under the panel and causing some lift.30,000 miles and several days in high headwinds and higher speed, all is good. I ran the wire down thru the fridge vent and under my kitchen counter. Put a cut off switch in line between the panel and the controller. The controller was mounted near my step where my batteries are located. Ran heavy gauge wire to the batteries. Also installed Trik--L- Start to keep things charged on the Benz side when she is not in use or boon docking/parked for extended time. Check your Coach batteries monthly to make sure acid not cooking off. After 1 year of continous use, levels remain at the proper levels. PM me if you have other questions.... I may not be able to answer all. I have had extensive experience with my Prism and its "quirks"
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