Now I Can Run Both Front and Rear Air Conditioners at the Same Time on Shorepower.
"Penny's front air conditioner (still original) struggles to keep the Motorhome at 78 degrees when the outside temp is in the nineties. Wanted to run both air conditioners at the same time, but the Airstream Manual says only the generator can run both. By a fortuitous coincidence, QuiteMaryContrary is removing her 310 interior and provided the following information:
"i just recently had my rear ac removed and put in a fantastic fan. its all sealed up or i would send you a pic
but originally 120v power came directly off the side of the ac and ran to the curbside following the rib supporting the ac.(my generator is curbside)
the wires ran to a switch that allowed either genny power or its own dedicated plug-in AC power
the switch was under the curbside bed platform right next to the genny box.
i could not run both a/cs at the same time w/ the generator.
i bet it probably does something similar in yours with ac power running to whatever side your generator is on or directly down thru the floor and twards the main ac fuse panel(mine happens to be in the very rear hidden in a credenza by the bed)
if you take off the interior ac shroud and peek into the interior skin there are alot of wires that are running thru that very spot and down along that rib towards the generator.
most of the rear power (water pump, tail lights etc) come up that rib on the streetside and down to the front to the 12v
there were only 2 small 12 gauge running directly back to the endcap for a light fixture
the only other thing under the rear endcap are those pesky top running lights that are all on one tiny unprotected circuit...grrr, i had to rewire the entire length but they work now
Following her advice, I dropped the AC cover and found the wire going into the sidewall cavity. Removing the curbside mattress, plywood, etc...I was able to find the junction box from the generator that supplied power to the ATS and the wire from the Rear AC.
So off to the hardware store to purchase:
4 single gang boxes
2 125V, 20 Amp outlets
2 125V Male Plugs
6 feet of conduit
Assorted clamps, staples, wire dogs, etc...
Luckily I had some 12/2 wire leftover from another project
Removed all power from the coach
Opened the junction box from the generator
Removed the wires from the generator junction box to the rear AC and attached a 125V Male end
Added a new piece of wire and clamp to the generator junction box in place of the old one.
Mounted a single gang box to the floor
Attached a clamp to the hole closest to the generator
Fed the other end of new wire thru the clamp and tightened
Attached the wire to a 125V, 20 Amp female outlet and secured into the single gang box
Attached a cover plate and marked it "GEN" with a Sharpie
Mounted a second single gang box to the floor
Attached a clamp to the hole facing the aisle between the beds
Fished a 12/2 wire from under the driver side bed thru the credenza at the rear of the coach to the curbside bed
Attached the wire to a 125V, 20 Amp outlet and secured to the single gang box
Tightened the clam attached cover plate and marked it "SHORE"
Fed the conduit from under the coach to the driver side bed
Mounted a single gang box under the bed close to the credenza
Fed the 12/2 wire thru the single gang box
Fed the conduit thru the single gang box and secured
Connected the white, black and ground wired and secured with wire dogs.
Fed the other end of the conduit thru the driver side rear storage locker and secured it a single gang box. Attached a 125 V Male end to the wire.
Made sure the rear AC was still turned off
Plugged the Rear AC Male cord into the "SHORE" outlet
Went outside and attached a 25 foot heavy duty 120V, 12 gauge heavy duty extension cord female end to the male end in the single gang box
Plugged male end of extension cord into the house 15 amp outlet
Plugged 30 Amp RV Shore Power cord into our 30 Amp Outlet
Went inside, said a silent prayer and turned on the rear AC...Cool air began flowing
Turned on the Front AC and the coach cooled quickly...to quote my good friend Dudley..."cold enough to hang meat in there"
After a while, shut off the AC units and disconnected the Shore Power Cords
Pulled the curbside bed door and swapped the Rear AC cord from "SHORE" to "GEN".
Fired up the generator, waited several minutes and turned on one AC unit at a time, both worked as they should
Still have to complete some final touches before I button Penny up...
- Align the two single gang boxes under the curbside bed.
- Install a blanking plate on the single gang box under the roadside bed
- Secure the power wire to the floor under the roadside bed
- Secure the single gang box in the rear basement storage locker
- Secure the Male plug into the rear basement storage locker single gang box and attach a hinged cover.
- Secure the conduit under the coach to prevent chafing.
Approximate cost - $58.00
Time - about 4 hours of actual work (most of the time was spent fishing the wire )