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Old 04-26-2012, 01:36 PM   #1
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Solar Panel (Film)

OK, so got a 10ft solar uni-solar film 24volts 128watts (for a fraction of what they used to go for…) - what's the best way to wire it down? I am thinking thru the refrigerator housing on the roof and then MPPT connected to the 12 cables that run along the refrigerator panel… hope that makes sense.
Not sure how much if any cooling air the MPPT needs (once the battery is full the energy will have to dissipate somehow…)
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Old 04-26-2012, 04:56 PM   #2
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I have 4 Unisolar panels, 68 watts each, on my roof. I bought it as a kit knowing nothing about solar and it really didn't come with any instructions. Hopefully you won't make costly mistakes like I did. I let my nephews install them and they don't know more than I did.

First, if you don't know solar well I highly suggest you first read Handy Bob's solar blog.

The RV Battery Charging Puzzle HandyBob's Blog

Bob is a solar expert and off grid guru who lives what he preaches. And he is not a retailer trying to support his overhead and employees. His advice is not adjusted to suit his cashflow needs. I have had a ton of help from him after I
paid a well known solar company almost $900 to get me up and running. And they almost got me working right. Bob gave me the needed help to have a fully functioning system that allows me to boondock with only using the generator to run the microwave.

My kit came without some essential parts -- fuses, a combiner box, cables to run from the charge controller to the batteries and a battery monitor. A lot will depend on how you plan to use solar-- just to maintain your house or chasis battery or if you plan to boondock. Do you plan to add more panels in the future?

Some vital points I learned from Bob ---
*Use large cable -- mine are all 6 guage
*Keep the cable runs as short as possible
*The charge controller needs to be as close to the batteries as possible -- mine is in the well vented battery box under my steps
*Use good batteries -- I have 2 six volt golf cart batteries linked to make 12v

There are more vital points that you will find in Bob's blog.

As far as where to run the cabling -- many people have run them down the
frig vent. Mine run down the back of my moho, which was my first mistake and one I can't undo. Once stuck, the panels are there for good.

And 24 volts? Do you know if that will work with moho batteries?

Are there any more bargain panels where you got yours?
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Old 04-26-2012, 05:01 PM   #3
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My new MPPT has a heat sink attache and there were vert specific instructions to mount it vertical so that heat would properly dissapate. My understanding is that it needs to be at the same temp as the batteries.
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Old 04-26-2012, 06:37 PM   #4
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waiting for a 24v to 12v mppt in the mail to arrive...
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