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
| Brand | ECO-WORTHY |
|---|---|
| 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
| Brand | ALLPOWERS |
|---|---|
| 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 |