I pulled the trigger today.
100w mono semi flexible panel from Renogy. $199, free freight.
The 3 lbs weight
(vs. 16.5# for their conventional glass panel) was just too good to pass up. I'm going to rig up a slide in mount on the roof. The panel will live there and stay up there if we are boondocking
in the sun. It will slide out and go into a frame to sit on the ground if we are boondocking
in the shade. I'll have this built in a couple of weeks and post some pics then. The light weight
and 0.196" thickness makes me believe this 'best of both worlds' solution will be hassle free.
Schneider Electric, formerly Xantrex C-12 12amp PWM controller. $77 plus $13 freight from N Arizona wind and sun.
Boy, was this a complicated issue. You can read all the PWM vs MPPT discussion above. I decided the extra cost of MPPT was not justified by my puny little 100w panel.
In my research I noted different controllers use different voltage set points for bulk, absorption, float and equalize phases. I looked up Trojan's recommendation for my T105s and found none of the controllers (nor does my battery
charger) meet their specs. I chose the Xantrex C12 because the voltage set points for bulk and float are user adjustable. I asked a Trojan tech support guy if this mattered and he said "well, ya, sort of, the battery
will last longer, not gas as much, it's probably better". Not an unequivocal "yes" but not "it doesn't matter" either. I asked the salesman at Az wind and sun if it mattered, he leaned closer to "yes" than the Trojan guy. I was going to get a Morningstar Sunsaver 10 amp which they say is their most popular controller. I asked him, since T105s are certainly a popular battery choice for deep cycle applications, what about the mismatch? He said most people never dig this deep and the Sunsaver-T105 combo works good enough.
Here's a little table of the different voltage points. I hope the columns stay lined up.
$80. $56. $22. $90
TROJAN. IOTA. TRACER M'STAR. RENOGY. XANTREX
DLS30 1215Rn. SS-10. 10 Amp. C12
Bulk. 14.8. 14.8. 14.6. 14.4. 14.4. Adjust to 14.8
Absorb. 14.8. 14.2. 14.6. 14.4. 14.4. Adjust to 14.8
Float. 13.2. 13.6. 13.8. 13.7. 13.6. Adjust to 13.2
Equalize. 15.5. N/a. 14.8. 14.9. 14.6. 15.8
All are 10 amp PWM except the tracer is MPPT. Xantrex is 12a PWM.
Another plus for the C12 is that it will handle 200w of panels so if I find 100w isn't enough I can add more and keep the same.
I ordered 50' of 10/2 marine duplex wire from genuine dealz for $52. Free freight. I've used this supplier for all the wire and terminals for my electric boats. Good quality, good service, lowest prices anywhere. I plan to drill a hole in the bottom of the trailer under the bed where the controller will go, route under the trailer and up the back wall to the panel. If I take the panel down I'll have about 7' of wire to move the panel on the ground. I'll use the rest of the cable, about 30, to make an extension cord if I need to locate the panel further than 7' from the back of the trailer.
The panel comes with MC4 connectors so I got a five pack for $10 on Amazon.
I'll begin installing this stuff in a couple of weeks and will update this thread when it's all done.