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diy solar

EV Charging Station on my Trailer

TheDoctorUSA

New Member
Joined
Aug 29, 2025
Messages
51
Location
California
Hi everyone!

I've been watching Will's videos and have been extremely fascinated about solar.

After watching one of his last videos about the 10kW system, I decided I would make one myself.

Here's my situation: I have a 40-foot residential trailer parked on private property that I use as kitchenette / music room / office. I am not planning on moving this trailer for another 2 years at least.

I planned to put 12 400w solar panels on the roof. After measuring it I can confirm that they would totally fit, the only problem I see is the 6 panels in the back would stick out about 2 inches from the sides since I have a big air conditioning unit in the center (hopefully not a problem since I do not plan on driving the trailer with them attached).

The 12 panels would go through a PV disconnect breaker and then into the SunGoldPower 10kW 48v split-phase inverter.

I would then connect a battery (the 16kWh Yixiang probably) to the inverter and then connect a little utility box with a NEMA 14-50 for my Tesla.

My questions are as follows:

1) Can I find brackets that can stick out of the roof and attach the solar panels on them? I would probably need some kind of elevation to make clearance for the bathroom and kitchen vent caps.

2) Is my setup ok? I calculated that I could charge my Tesla around 70-80 miles a day, which is all I would need for my commute, and I could also plug the trailer in when not charging, to make the ROI come faster.

The reason I decided on doing this is for the soon to leave tax incentives, that would make the whole system less than $4,000.

Unfortunately, my electricity rate is $0.40 per kWh, so the expected ROI as of now is 16 months.

Also, this would be a completely off-grid system.

Thanks everyone for your insights
 
Looks good. There are brackets for any type of roof or make your own.

Not sure 16kWh battery will give 70 miles per day as the sun is probably setting at the vehicle plugs in.

16 month payback is well with the investment.
 
Looks good. There are brackets for any type of roof or make your own.

Not sure 16kWh battery will give 70 miles per day as the sun is probably setting at the vehicle plugs in.

16 month payback is well with the investment.
Thank you for your reply!

Right now I'm thinking of wooden battens attached with some kind of heavy duty glue or adhesive to the TPO membrane on the roof, and then Z mounting brackets that attach to the panels.
 

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