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mtnman1000

Idaho

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Posted: 05/30/20 10:03am Link  |  Quote  |  Print  |  Notify Moderator

I am getting ready to install a couple solar panels on my 28' Keystone Springdale and am trying to determine how to get the charging to to the front mounted 6V batteries. I was thinking of running the MC4 wiring down the fridge vent then to the wardrobe closet where the controller will be. From there my thought is to wire the controller to the 12V input lugs on the fridge. There is about a 23' run from there to the breakers (15 amp) then battery battery but I don't know the AWG of that wire.

Would this work OK? I figure if it's 8 AWG it get a 2.5 % drop. Also if I installed more than 2 100W panels, the breaker to fridge would be too small I think.

Outside of this I'd need to figure out how to get the controller in the front storage then charge cable tray from there to the batteries. That would be a bit out of my league though.

Lwiddis

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Posted: 05/30/20 10:27am Link  |  Quote  |  Print  |  Notify Moderator

A solar controller needs ventilation. Will the controller receive adequate ventstion in a closet? Further, a solar controller should be mounted as close to the batteries as practical. How close is the closet to the batteries? A two percent drop is all you should tolerate. Six gauge to the batteries is better. You’ve complied with a solar wiring chart?


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BFL13

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Posted: 05/30/20 10:32am Link  |  Quote  |  Print  |  Notify Moderator

Need a link to your floorplan. A utube of a 2013 28ft Springdale TT was for a bunkhouse model, didn't make it clear where the converter is, eg.

More info on that would help with your options. It would be better to run the controller in parallel with the converter than from the back of the fridge for amount of voltage drop.

Usual way to get wiring from tongue to front storage is drill hole in floor up front and go down and up to the tongue instead of going through the front cap.


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agesilaus

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Posted: 05/30/20 10:50am Link  |  Quote  |  Print  |  Notify Moderator

I was told to use one of these breakers on the line into the controller: solar breakers. And 15 amp is too small. I got the type they show as a 40 amp with the lever. You can use it as an on/off switch too.


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corvettekent

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Posted: 05/30/20 11:28am Link  |  Quote  |  Print  |  Notify Moderator

The fridge breaker would be 120 volt so do not run your charge controller there.
You want as short of a wire run as possable so you should mount the solar panals on the front part of the roof, drop the wires down in conduit into a forward closit or bathroom. Mount the charge controler the forward storage compartment and then run those wires to the batteries.

When you shut off the main battery switch the solar should still be charging the batteries.


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CA Traveler

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Posted: 05/30/20 11:45am Link  |  Quote  |  Print  |  Notify Moderator

Drop the notion of pre existing wiring convience. The critical path is from the solar controller to the battery where small losses can cause significant loss of battery charging. Mount the controller as close to the batteries as possible.

12V panels produce about 18V and that wiring can tolerate significant voltage drop w/o power (battery charging) loss if you're using a PWM type controller. MPPT controller are a different consideration.

The key paths are panels to controller and controller to batteries. The refer and it's DC wiring is not involved.


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RLS7201

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Posted: 05/30/20 12:08pm Link  |  Quote  |  Print  |  Notify Moderator

No need to worry about distance between charge controller and batteries. You can purchase a MPPT controller with adjustable voltage or get a charge controller with separate voltage sense leads. Just make sure the wires are large enough to carry the current.
My controller is over 25 feet from my batteries and has separate voltage sense leads & is fully adjustable. Maintains the batteries correctly.

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mtnman1000

Idaho

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Posted: 05/30/20 04:45pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks all for the responses. Based on all this I will try and mount towards the front and use the front storage compartment. I'll have to find someone who understands the drilling and sealing piece. I've installed plenty of solar systems for off grid cabin use but don't want to compromise my rv.

Again, thanks everyone.

Lwiddis

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Posted: 05/30/20 05:13pm Link  |  Quote  |  Print  |  Notify Moderator

“My controller is over 25 feet from my batteries...”

That’s not the advice of WindyNation - “Mounting is optional but for best results, locate the charge controller as close as possible to the batteries and the batteries and charge controller as close to the panels as practical.”

naturist

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Posted: 05/30/20 08:24pm Link  |  Quote  |  Print  |  Notify Moderator

This: Entry gland





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