RV & Off-Grid Sizing Calculator
Size your off-grid solar and battery in about a minute
Tell us how you camp and what you run. We will turn that into real solar watts, a real LiFePO4 battery bank in amp hours, and a real inverter size, not a guess pulled from a forum thread.
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Question 1 of 4
Do you run air conditioning?
This is the honest driver of the whole build. An RV air conditioner is the single biggest load, so it decides your inverter and how big a battery bank you really need. Not sure of the size? Look for the BTU rating on the rooftop unit label.
Question 2 of 4
How do you use your rig?
This sets your everyday draw. The fridge, lights, water pump, and device charging that run whether or not the AC is on.
Add Starlink for always-on internet
Constant comms and internet, miles from the nearest hookup. It is the biggest optional draw on a rig, so if you want it, we size the bank and array to carry it honestly.
always online
Flip this on to include Starlink for constant internet, even miles from a hookup.
Question 3 of 4
How much roof do you have for panels?
Most RVs ship with a single panel. The real question is how many more your roof can carry once you work around vents, the AC unit, and hatches. A rough call is fine. We confirm the layout when we build.
Question 4 of 4
How far off the grid do you go?
This sets how much battery runtime we build in, and whether a 24V bank makes sense. A bidirectional inverter and charger means the same system runs off-grid or hooks straight to shore power.
When you do plug in, what shore service is on the pedestal?
This sets how much power the rig can pull through the cord for charging and pass-through. 50A rigs charge the bank faster and run heavier loads on shore. It does not change your off-grid solar math.
A day off-grid
Here is how your roof keeps up
This is the honest picture before we size a single component.
Add a soft start on the air conditioner
An AC pulls a big surge the instant it kicks on. A soft start smooths that surge, so we can spec a smaller, cheaper inverter and still run the same unit. It is almost always the smarter money.
bigger inverter Soft start on
smaller, cheaper
Soft start on. It cuts the AC surge, so we can spec a smaller, cheaper inverter.
Your build
Here is your off-season upgrade, sized honestly
These are honest ballpark ranges to plan around. Your final number comes after we review your rig, so there are no surprises. Build it inside over winter, ready for next season.
Send this build to Dmitry
Your sized components go straight to Dmitry so he can book you into the fall and winter RV maintenance season. We build the system inside over winter, so your rig is ready the day the season opens. A Master Electrician does the work, not a subcontractor.
Got it. Dmitry will call you within 24 hours.
We will get you booked into the off-season build schedule. Prefer to talk now? Call (780) 904-3462.
Rather just talk it through? Call (780) 904-3462. A Master Electrician answers, not a call centre.
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What happens next
Three steps, sized to your actual rig.
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1
Tell me how you camp
Boondocking in October is a different system than serviced sites in July. That answer sizes the bank.
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2
I spec it against your roof
Real panel dimensions on your actual roof, minus the vents and the AC shroud. No wishful layouts.
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3
You get the build sheet
Panels, controller, inverter, bank and wire gauge, itemised. Install it yourself or book us.