I have a the 3705 SLC Weekend Warrior. I just recently switched the two 12 Volt batteries to two 6 Volt batteries. Is there anyone that instead of just putting two batteries in, but made room for four batteries. I want to know you did it and where you put the other two batteries... Also how did you wire them all together...If you have pictures and wiring diagram that would be very helpful...Thanks in advance.

Not much help but a buddy did it in the same trailer as yours with no problems.

Click to view attachment

I went from two to four in my LE. I had to rotate the 3 propane tanks and move the little seperator wall. No biggie. Big deal was the new tray welded up...


Works great.

I have a SLC3905, and I added not only 4 batteries, but a 110V compressor with a 5 gal tank in the front compartment.

On my trailer, there is a divider in the middle, my propane tanks are on the passenger side and the batteries are on the driver's side.

I put a 1/4" sheet of plywood down on top of the steel mesh. Then looking into the compartment, I just set the air compressor all the way to the right side. This left an area about 24" x 24". If I put the batteries in long end sideways, they wouldn't fit, nor would they all fit short side sideways. What I ended up doing is placing them in there in an alternating pattern. 1st battery long end sideways, with the 2nd battery on the right, short end. Then the 3rd battery goes in on the left, short end, with the 4th battery on the right, long end.

Here's a drawing.

Click to view attachment


This is a bird's eye view of the entire front compartment. L-R, 2 propane tanks, center divider, 4 golf cart batteries, and 110V compressor.

Not sure what year SLC Socal has but my generator is located where he says he put his compressor.
Here's what I did. Not 6 volt, I went with 2 ea. 8D 12 volt marine storage batteries. They have huge reserve capacity.
I could easily accomodate 4 to 6 ea. 6 volt batteries if I ever decide to change.

Click to view attachment

Click to view attachment

Click to view attachment

Just cell phone pics but you can see the frame welded above the genset to hold the second battery.

Damn those 8-D's are impressive, makes my Trojan 125's look little.

Are those batteries just sitting on top of the genset enclosure with a frame to keep them from sliding around? Or did you just have a new shelf installed? Can I put two 6 volts on top of the genset if I can find a way to keep them from sliding around? Any wiring issues i should be concerned with If I put two on the genset and two in the stock location?

Pics????

The batteries don't actually touch the genset enclosure at all.
The front edge of the enclosure already has an angle iron frame, all that was done was another frame was welded and bolted to the rear and the stringers and battery frame was then welded in place.
Clear as mud?

Here are some pics showing the added rear angle iron frame and the battery tray clearance above the genset enclosure.

Click to view attachment

Click to view attachment

Click to view attachment

These were also taken with a cell phone only now with flashlight lighting.

If you build a frame to support and contain the movement of the batteries there would be no reason not to put the batteries up there.
No wiring issues at all. As long as you follow the previously posted diagram your batteries don't really care if they are together or at a reasonable distance apart.
The closer they are together the less you spend on copper cable but that's it.

Four trojans fit in my '08 CR3705, they also fit in the same spot in my '03 SLC3705

could you guys explain the 6v swap?? why??? and how come no ones using optima deep cycles?...

The 3705 must be different then the 3905, or maybe just a different year. I plan on changing this setup out to 6 T105's as soon as I come up with the extra cash.

Click to view attachment

If you truely want to know, read this.
http://www.ccis.com/home/mnemeth/12volt/12volt.htm

And also this.
http://www.ccis.com/home/mnemeth/12volt/12volta.htm

They will explain exactly why certain battery types are better than others along with alot of other excellent info.

My trailer came with 2 Optima yellow's, now I have Trojan T-125's.

Optima Yellow=44lbs
Trojan T-125=66lbs

That's 50% more lead, much more storage capacity. And one of the Optimas has a shorted cell, a $200 battery that is junk.

What about the heat generated from the generator? I would think it would shorten the life of the batteries? Great post though, I want to do the same thing in my 09 SLC3905 - just worried about the space issue. Maybe a little more angle iron to give it a few inches of clearance from the to of the Generator.

Those four Trojans look great. I'll have to take a few measuements to see if they will fit. It will be tight for sure.

My two 12v's are my weak spot. Put 160W of solar on last summer and just put on a nice 1000w inverter to run the TV's.