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alliemac9's avatar
alliemac9
Explorer
May 22, 2014

Layout of Components for Solar Install

I'd like some input on my conceptual plan for my solar install, in particular the best location for the various components.

For reference, here is my floor plan:





This photo is looking in the entry door at the battery box under the step. The cabinetry to the left of the battery box houses the fridge (above) and the furnace (below), with a shallow storage cabinet facing the steps, just above the photo edge. The couch is to the right. Most of the area beneath the couch is a metal box for our primary exterior storage bay. However, there is storage along the front and both sides of the couch. Currently, our inverter is mounted just inside the end of the couch shown on the right.

Panels - Four 158W panels mounted in parallel. Wiring drop through fridge vent should drop wires straight down to left of battery box.

TriMetric - Mount somewhere on cabinet to left of battery box. This is also where the RV control panel is, so this seems like the best spot. Just need to decide whether to mount it up high or down low.

Shunt - This should go in with the batteries, right? Like in the small compartment to the left where the wiring connections are already managed?

Tristar 60 Amp PWM Controller - This is my main question... I know this should be as close to the batteries as possible, so I have two options. Option 1 would be to mount it on the inside of the end of the couch where the inverter is. This would be rather tight to access for wiring (since I cannot move the big metal box that is the exterior storage). However, this would be an interior location if that is relevant. Option 2 (what I was hoping to do) would be to mount it in the external storage compartment that is under the couch (see photo below).



This is the exterior storage bay (the end of which is about 23" H x 23" W and there is currently about 6" between the wall of the bay and the first storage boxes). I envision mounting the charge controller and related stuff on this end wall which is just under the couch and therefore adjacent to the battery box.

Batteries - Will stick with current set until they die. Then likely upgrade to 2 Trojan 27TMH 12V batteries (my battery compartment is not tall enough for 6V batteries).

Inverter - Will stick with current 400W inverter for now until/unless we find we have need for something else. This is already wired with an on/off switch and mounted under the couch and would anticipate it will stay there.

Any thoughts?

18 Replies

  • I look at this a little differently and have not studied the solar completely yet as I'm still figuring out my basic power setup. But, as I understand it if you are getting identical panels then their output voltage will all be the same so buy the higher voltage panels of 30 volts(24v system panels), let the PWM controller bring it down to our charge rate of 13.8/14.4 etc. It will cut the cost of the panels almost in half and allow use of a smaller amperage controller and wire size due to lower amperage(I think they are based on input amperage-this needs to be verified) cutting cost further. "They say" you will also gain a couple of points of efficiency with the PWM.

    I don't know enough about MH's to comment on location, but if you're concerned about the distances make sure to be generous on wire size. We have had 220 watts solar and a 400 watt Samlex for 4 years on our truck camper with no problems. I don't know if you can run enough stuff off 400 watts to really draw the system down. At least we can't. This time around very few to no hook ups, basically full timing and want to run microwave and coffee pot with a portable genny only for emergencies so things inverters(2kw) and wires(2/0) get really big quickly. Also just remember that with panels not pointed directly at the sun that the efficiency is lower, I've never seen more than about 11 amp output(in October with a low sun angle) or about 50% of the panel rated output which is not to say that other folks don't do better.

    I'm near Salida if I can be of any assistance pm me.
  • +1 for mounting in a utility cabinet vs. the storage bin.

    I would not worry about cooling vents unless you manage to actually get the controller hot. Then just add a 12v computer fan if needed.
  • It looks like all you have below the fridge is an empty box with a furnace vent in it that could easily be moved. That would be ideal with a few lovered vents for the cc, put the trimetric in the existing hole of the furnace vent and move the vent forward. Eliminates a whole bunch of wiring and doesnt utikize space that is already taken up and needs to be accesed often.
  • I'd put in the storage compartment then since the distance is really short. And I might add two vents to allow ariflow through the compartment.
  • @mena - Maybe a little over a foot? The batteries are under the entry steps. If you look at the last photo of the storage area, you can see the entry door open on the left side. So the distance is about the width of the white side of the RV you see between the entry door and the storage compartment.

    @smkettner - Thanks! Would some sort of vent hole at the back of the compartment be helpful? We usually travel in cooler weather, but obviously want to be set up for whatever.
  • High voltage solar down the fridge vent across the battery compartment to the controller mounted in the storage shown. Then easy to push the 12v charge wire back to the batteries.

    Possibly put the controller in with the fridge if there is space. (my preference)

    The MS-60 needs some air for cooling so you may need to reorganize the storage with some smaller bins.

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