10 Best Solar Backup Generators 2025 in the United States

The EF ECOFLOW Solar Generator DELTA2 with 220W Solar Panel is a reliable and versatile option for those needing backup power for home, camping, or RV trips. With a substantial battery capacity of 1024 watt-hours and a power output of 1800 watts, it can handle most household and outdoor appliances. The included 220W bifacial solar panel enhances energy capture by up to 25%, making it efficient for off-grid use. One standout feature is its durability, with the LFP battery offering a lifespan of over 3000 cycles, ensuring long-term use.

Fast charging capabilities mean the generator can be recharged quickly, which is a major plus for emergencies or frequent usage. Portability is decent, although at 58 pounds, it might be a bit heavy for some users to carry around easily. The device is highly versatile, with 15 different outlets and the ability to expand capacity from 1kWh to 3kWh by adding extra batteries.

However, its bulkiness and weight might be drawbacks for those looking for a more compact and lightweight solution. Additionally, while it offers numerous charging options (AC, car, solar), the initial setup might seem complex for some users. Nevertheless, for anyone needing a robust and efficient solar generator, this model, with its solid build quality and extensive features, is definitely worth considering.

The EF ECOFLOW Solar Generator DELTA Pro features a robust 3600Wh battery capacity, making it a substantial choice for home backup, camping, RVs, and emergencies. Its power output reaches up to 3600W with the ability to boost up to 4500W, ensuring that it can handle a range of household appliances and electronic devices. The generator includes 15 versatile outlets, including 5 AC outlets and multiple USB ports, which can cater to various charging needs simultaneously.

The inclusion of a 400W portable solar panel is a significant advantage, providing efficient solar charging even under less than ideal weather conditions. The panel's 22.4% conversion rate is quite efficient in the solar panel market. With single or multiple panel setups, recharging times range from 3.5 to 11 hours depending on the configuration used, offering flexibility in charging options.

Portability is somewhat balanced, with the solar panel being foldable and easy to carry at 35.3 lbs, while the main unit weighs 99 lbs, which might be cumbersome for some users to move around frequently. The build quality is notable with an IP68 waterproof rating, ensuring durability in various environments. However, the generator and solar panel are shipped separately, which could be inconvenient if timing is critical. The smart app control feature adds modern convenience, allowing users to monitor and control the generator remotely via Wi-Fi or Bluetooth. This solar generator is an excellent choice for those needing reliable and versatile backup power, although the weight of the main unit could be a consideration for portability.

The EF ECOFLOW DELTA 3 is a powerful and versatile portable solar backup generator designed for home backup, camping, and RV use. It features a substantial 1024Wh LiFePO4 battery, which is known for its long lifespan and durability—rated for about 4000 charge cycles and a 10-year daily use expectancy. This means it can last much longer than many other batteries on the market, making it a reliable long-term investment.

With an 1800W continuous power output and the ability to surge up to 2200W (3600W briefly with X-Boost), it can run up to 13 appliances at once, including high-demand devices. The inverter type is electronic, providing stable power suitable for sensitive electronics. The device supports fast charging including 500W solar input and a 1500W AC input, allowing a full charge in under an hour, which is excellent for quick turnaround during emergencies or outdoor trips.

Solar panel compatibility is good, though solar panels are sold separately. The system supports expansion up to 5kWh by adding extra batteries, giving users flexibility to increase capacity when needed. EcoFlow also emphasizes durability with an IP65 rating on the battery pack, protecting it from dust, splashes, and oil, which is beneficial for outdoor use.

Portability-wise, the unit weighs 27.5 pounds (about 12.5 kg) and has a compact design, making it manageable but not ultra-lightweight. It offers multiple charging options including AC wall, car, and solar charging, which adds to its convenience. One minor downside is that the solar panels are optional extras, so the cost can increase if you want a complete solar solution. Also, while the weight is reasonable for its capacity, it may not be the best choice if you need something very lightweight for backpacking.

The DELTA 3 is a robust, fast-charging solar generator with excellent battery life and power output suited well for home backup and outdoor activities where multiple devices need reliable power.