9) How we test solar generators

Our product experts keep close tabs on the solar generator market, tracking popular models and the new innovations at trade shows like the Consumer Electronics Show (CES) and the National Hardware Show.

For this guide, our experts conducted a detailed technical review of over 30 solar generators, then performed hands-on testing of the top dozen models, both in our Lab and in the homes of a dozen consumer testers over the course of several months. Our evaluations focused on the following:

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8) How we test the best solar generators

✔️ Charge Time and Capacity

Verified claimed charging times using solar panels and AC wall outlets in our Lab.
Tested claimed capacity by running electronic devices with corresponding energy loads (e.g., 1,500-watt heaters for large-capacity, laptops for small-capacity) in our Lab.
Consumer testers measured solar charge times and capacity under real-world conditions at home.
Our engineers reviewed technical data to confirm shelf life (how long charge is held) and life cycle (number of recharges).

✔️ Usability

Checked total number of outlets to gauge how many devices can be charged simultaneously.
Assessed user-friendly features such as carrying handles, wheels, LED lights and onboard storage.

✔️ Durability

Tested durability of both the generator and solar panels for long-term performance.

12) What to look for when shopping for solar-powered generators

Solar generators come in various shapes and sizes to meet different needs. Key factors to consider include:

✔️ Consider capacity The more watts, the more power a generator can deliver, so consider your home’s power needs. Small generators have capacities around 250 watts, while larger ones offer 3,000 watts or more. Overloading a generator can damage it and connected electronics.

Also consider run time: to power a 200-watt refrigerator for 10 hours, you'll need a 2,000-watt generator. For an eight-hour run of a 40-watt CPAP machine, a 500-watt generator is sufficient.

✔️ Ensure solar panel compatibility Solar panel capacity affects charging speed. Our experts recommend at least 100-watt solar panels, and daisy-chaining multiple panels can speed up charging. Generators that can charge via wall outlets and solar panels are the fastest.

✔️ Choose a battery typeThere are three main battery types — lithium ion, LiFePO4 and solid-state — each with pros and cons.

Lithium-ion batteries are most common, offering safe, reliable power and have been the standard for solar generators for years.
LiFePO4 batteries are the latest technology, providing longer lifespans and faster charging, though they struggle in extremely cold temperatures.
Solid-state batteries are emerging and rely on solid electrolytes rather than the liquid electrolyte solution found in lithium batteries. They offer higher capacities but tend to be bulkier and heavier.

✔️ Think about portabilityWeight, which can range from 10 to over 100 pounds, often correlates with capacity. If you need to take your generator on the go, look for user-friendly features like wheels and telescoping handles for easier transport. Solar panels can also be heavy, so handles and carrying cases improve portability.