RV Solar & Battery Sizer

A free, play-with-it calculator for sizing an RV solar and lithium battery system — starting from your actual appliance loads. Built by Lavender Mobile RV Solutions, mobile RV repair serving Santa Barbara & Ventura Counties. It's an early preview of the solar & battery design service we're rolling out soon, so treat the results as a friendly ballpark, not a quote.

1Your loads

Pick your rig type to preload typical appliances, then edit the watts and hours/day to match how you actually camp. Toggle AC (runs through an inverter) vs DC (straight off the battery), or switch a load off if it won't run on solar power.

	Appliance	Watts	Hrs/day	Bus

2How you use it

System voltage

Days of autonomy days of low/no sun to cover

Peak sun hours Santa Barbara ≈ 5–6 summer, ~4 winter

Usable battery % % depth of discharge — lithium ~80

System efficiency % — controller, heat, wiring, angle losses

Panel size (est.) watts per panel, for the count

Recharges while driving (would add a DC-DC / alternator charger)

Your estimated system

Daily energy

0Wh

Peak draw

Battery bank

0Ah

Solar array

Charge controller

MPPT, minimum rating

Inverter

continuous

Want the real numbers?

This is a ballpark to get you thinking. A proper design accounts for how your appliances actually cycle, your roof space, wiring runs, and safe install — that's the part we do. Master Certified, mobile, and we come to you across Santa Barbara & Ventura Counties.

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