The 10 Best Solar Car Battery Chargers
This wiki has been updated 9 times since it was first published in August of 2018. The electrical charge in 12-volt batteries slowly depletes over time, so if you have a car, ATV, boat, or RV that sits unused for long periods, you'll need to keep the battery topped off. One of these solar chargers can do it without adding to your electricity bill. They help extend the life of your battery, and some are equipped with USB outlets for powering mobile devices, too. When users buy our independently chosen editorial recommendations, we may earn commissions to help fund the Wiki. Skip to the best solar car battery charger on Amazon.
December 12, 2019:
When deciding on a solar battery charger, it is important to consider your particular needs - specifically pertaining to the model's total output (this will be more relevant if you're going to use it on large or deep-cycle batteries) and its functionality in cloudier regions.
But also very important is the cell material. Most consumer solar chargers use either monocrystalline or polycrystalline silicon as their photovoltaic component. Polycrystalline is more common due to several technological and economical factors but monocrystalline is more efficient at converting solar energy into electricity. Models like the Eco-Worthy 20-Watt and the Sunway Solar Portable use the less efficient polycrystalline silicon while models like the Battery Tender and the Schumacher SP-100 use high-efficiency monocrystalline. Schumacher claims that the SP-100 is built using monocrystalline but the its panels have a blue hue that is normally associated with polycrystalline so this does warrant some skepticism.
Batteries are dangerous and should be handled with care to avoid personal injury or damage to your vehicle's electrical systems.