The 8 Best Solar Battery Tenders

We spent 28 hours on research, videography, and editing, to review the top options for this wiki. Whether you’re leaving the car in long-term parking or just running too many electronic devices while out on that camping trip, you want the ignition to fire up without hesitation when you turn the key. A solar battery tender from our selection channels energy from the Sun to maintain voltage at optimal levels and extend the lifespan of your onboard power supply, so it’s ready to go when you are. When users buy our independently chosen editorial picks, we may earn commissions to support our work.

8. Sunforce 5W

The completely waterproof Sunforce 5W will keep your vehicle’s battery charged anywhere. The sturdy aluminum frame makes it a perfect choice for extended outdoor use, while the thin-film silicon design allows charging even in overcast settings.

  • Comes with mounting hardware
  • 12 volt dc plug and battery clips
  • Panel glass is fragile

Brand Sunforce
Model 50022
Weight 3.5 pounds
Rating 3.8 / 5.0

7. GHB Intelligent

The LED display of the GHB Intelligent provides easy monitoring of a battery’s charging status as well as the real-time output from the connected solar panels. With automatic under-voltage, overload and reverse-polarity protections, you can be sure your devices are safe.

  • Dual usb outputs
  • Works at home or on the road
  • Solar cells not included

Brand GHB
Model pending
Weight 10.4 ounces
Rating 3.6 / 5.0

6. Eco-Worthy Portable Backup

The Eco-Worthy Portable Backup has a wide operating tempature range, which enables it to extend battery life just as effectively if you’re shivering in Alaska or sweating in Arizona, and a shockproof design lets it switch between the two without being damaged.

  • Rust- and dust-proof
  • Clips prevent short circuiting
  • Cloth cover not uv resistant

Model L02EP10BB18V-1
Weight 1.4 pounds
Rating 4.0 / 5.0

5. Schumacher Maintainer

Amorphous technology ensures that even cloudy days won’t stop the Schumacher Maintainer. The reliable output will keep your devices topped up and ready to go, and the portable design means it can do the job wherever you want to take it.

  • Convenient dual adapters
  • Water-resistant
  • Environmentally safe

Brand Schumacher
Model SP-200
Weight 2.5 pounds
Rating 3.9 / 5.0

4. Deltran Solar Jr

With a compact design, a patented smart monitoring algorithm and a wide input range, the Deltran Solar Jr will convert an existing solar panel into a full charging system. The spark-proof operation ensures that nearby devices will remain safe.

  • Works with gel and agm batteries
  • Input up to 45 watts
  • Built-in blocking diode

Brand Battery Tender
Model 021-1162
Weight 4.8 ounces
Rating 4.2 / 5.0

3. Allpowers Maintainer

The ultra-lightweight Allpowers Maintainer is a highly portable charging solution that will extend the usage life of your batteries by keeping them topped up. The 18 watts of power work on all automobiles, from motorcycles to recreational vehicles.

  • No load voltage to 23 volts dc
  • Heat dissipating design
  • Completely maintenance-free

Model AP-SP-001-BLA
Weight 1.6 pounds
Rating 4.7 / 5.0

2. Deltran 15W

The Deltran 15W is water- and spark-proof to handle outdoor installations safely. The three-step microcontroller allows for precise charging, and the built-in temperature compensation sensor adjusts levels to avoid damage from overheating.

  • Do-it-yourself installation
  • Five-foot long cables
  • Reverse flow protection

Brand Battery Tender
Model 021-1165
Weight 11.2 pounds
Rating 4.6 / 5.0

1. Sunway Solar Portable

With all the computers and control modules in your vehicle, the battery is constantly discharging. The Sunway Solar Portable is your complete trickle-charge solution. It can keep your power supply ready for the next start even after sitting for weeks.

  • Flashing charge indicator
  • Suction cups for easy mounting
  • Cigarette lighter plug

Brand Sunway Solar
Model 3W solar trickle charge
Weight 1.4 pounds
Rating 4.9 / 5.0