Last year we bought a 355MBQS. Two of our favorite camping spots don’t have hook ups so I modified the electrical system.
I mounted 4 – 200-watt solar panels on the roof as a front pair and rear pair. Each pair is in series and then the two pairs are hooked together in parallel. Max power is 42.1 volts and 19 amps so I could use the existing Jayco roof solar inlet. The panels are screwed down to the roof with lots of Dicor around the mounts and screws and the wires are held down with Eternabond tape.
Here are the four panels mounted to the roof:
In the front compartment I put in 2 – 125-amp hour sealed AGM batteries for a total of 250 amp-hours (see the right side of the front compartment image). Because you shouldn’t discharge AGM batteries below 50% there is 125-amp hours of usable power. At some point I may replace them with Lithium batteries for the greater depth of discharge and lower weight. With Lithium batteries I could even go to four batteries and have 400-amp hours of usable power, I just have to get over the price.
I put in a Vectron Energy 150 volt – 60-amp charger (blue box in the middle of the image). The 42.1-volts – 19-amps from the panels gets converted to 14.4-volts and up to 54.44-amps so a 60-amp controller is needed. The Vectron can be monitored by your smart phone or tablet over Bluetooth which is very handy. My bedroom kind of looks over my driveway where I park the camper and I can check the batteries from there.
There is a 2,000-watt TrippLite pure sign wave inverter/charger (grey box on the left side in the image). I have used TrippLite before with good results, but this unit doesn’t behave correctly with the remote control and TrippLite discontinued the unit and hasn’t supported me. I disconnected the converter built into the camper and use the charger in the TrippLite, by doing that the TrippLite manages charging versus inverting and I don’t have to worry about the inverter and converter both running at once. I used the breaker for the converter to feed the charger.
Here is the front compartment:
Shore power comes in through the side of my unit, through the back of a cabinet, under a drawer and then into the power panel all on the front wall of my kitchen. I put a Technology Research 50-amp surge arrestor-transfer switch in the kitchen cabinet where the power comes in (mounted upside down for ease of wiring). I ran Romex from the power panel converter breaker to the front compartment for the charger and then another Romex feed from the inverter back up to the transfer switch. It was relatively easy to thread the Romex runs from the kitchen to the front compartment.
Here is the transfer switch:
I put a shunt in the ground line from the battery bank and hooked up a Trimetric battery minder so I can monitor the percentage charged for the battery bank. I ran the wire for the Trimetric display and the inverter/charger remote controls up to the cabinet in the master bedroom that has the washer/dryer hookups. I snaked the wire alongside the washer/dryer water lines.
Here are the remotes.
I also have a 120-watt Go Power portable solar panel from the travel trailer I had previously. I put a solar inlet into the front compartment so I can also hook that panel up. One place we camp has a lot of shade on the sites and with the portable panel and a long cord I can move it around to find sunlight. The Go Power has its own solar controller, so it runs right onto the main buses that come off the batteries.
Here is the electrical diagram for the whole system:
I have now camped for two weeks at one of the spots and a week at the other and the system has performed well.