"What size solar generator do I need?" is one of the most common questions from first-time buyers — and getting it right matters. Too small and you'll run out of power. Too large and you've overspent. Here's a simple, no-math-degree-required guide to finding your perfect size.
Understand the Two Key Numbers: Watts and Watt-Hours
Watts (W) measure how much power a generator can deliver at one moment — think of it as the "speed" of power delivery. Watt-hours (Wh) measure how much total energy is stored — think of it as the "fuel tank." You need both numbers to be right for your use case.
Step 1: List What You Want to Power
Write down every device you plan to run. Common examples:
- Smartphone: 5–20W to charge, ~10Wh per charge
- Laptop: 45–90W, ~50–90Wh per charge
- CPAP machine: 30–60W, ~240–480Wh per night
- Mini fridge: 30–60W continuous, ~720–1,440Wh per day
- Electric blanket: 50–150W
- Power tools: 800–1,800W (check your tool's label)
Step 2: Add Up Your Watt-Hours
Multiply each device's wattage by how many hours you'll run it. Add them all together. That's your minimum watt-hour capacity. Add 20% buffer for battery inefficiency.
Step 3: Check Peak Watt Requirements
Motors and compressors (like fridges and power tools) draw 2–3x their running wattage for a brief moment at startup. Make sure your generator's peak watt rating can handle this surge or it will shut off when those devices start.
General Size Guidelines
- 500–1,000Wh — phones, tablets, laptops, small fans, lights, and cameras. Ideal for day trips, weekend camping, and emergency preparedness.
- 1,000–2,000Wh — adds mini fridges, power tools, TVs, and CPAP machines. Perfect for extended camping, RVs, and home backup.
- 2,000Wh+ — whole-home backup for essentials. Powers refrigerators, medical devices, and multiple appliances simultaneously.
Find Your Size
Browse our solar generator collection, organized by capacity so you can quickly find the right power station for your needs — from compact weekend units to whole-home backup systems.
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