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Choose the right off-grid power system

Answer a few simple questions and get a safe starting range. Then refine with the calculator if you want.

How This Works Use the wattage calculator →

Built for RVs, cabins, and backup power.

How this works

Three simple ideas

This page gives you direction, not engineering math. It uses real sizing logic in plain words.

1) Daily use (kWh)

This is how much power you use in a day.

LightPhones, lights, laptop

MediumFridge, TV, fans

HeavyAC, tools, pumps

2) Battery size (kWh)

Battery is “how long you can run” without sun.

Simple rule: Battery ≈ daily use × time

3) Solar size (W)

Solar is “how fast you refill.” Shade and winter often need more solar.

Simple rule: More sun = faster refill. Less sun = slower refill.

Start sizing my system Or use the wattage calculator →

Step 1

What are you powering?

Pick the closest match. You can change it later.

Next: daily use →

Step 2

How much power do you use?

This is your daily “power budget.” It drives everything else.

If you’re unsure, pick medium. We’ll refine it later.

Next: runtime →

Step 3

How long should your power last without sun?

This sets how much battery you need.

Quick rule: more time usually means more battery, not just more panels.

See my starting point →

Your starting range

Based on what you picked

These are safe starting ranges. Exact sizing depends on usage, location, and shade.

Setup Choose above

Daily use Choose above

Runtime Choose above

Pick your options above to see your range.

System type

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Battery starting range

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Solar starting range (good sun)

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Assumption will show here after you select options.

Want a tighter number? Use the wattage calculator →

See real power setups that fit your results

We’ll email example system setups based on what you selected — sized for your usage, runtime, and setup type.

Use the wattage calculator →

Tip: if you run AC, pumps, power tools, or electric heat, use the calculator.