Direct solar charging speed measures how quickly a solar panel will charge electronic devices. The primary purpose of a solar panel is to transform sunlight into usable energy efficiently. Therefore, we placed a lot of emphasis on direct solar charging speed in our testing.
Here’s a simplified way to estimate how long it’d take for the solar panel to charge the battery: 1. Divide solar panel wattage by battery voltage to estimate maximum charge current output by solar charge controller: 2. Multiply current by rule-of-thumb system losses (20%) and charge controller efficiency (PWM: 75%; MPPT: 95%): 3.
Like in direct solar charging speed, the BigBlue SolarPowa 28 performed near the top in indirect solar charging testing, generating 872 mAh in an hour. The Sunjack 25W performed about as well and generated 873 mAh of charge in one hour.
Example: 6 Watt Solar Panel charging a 4,000mAh, 3.7V Battery – Time = 14.8Wh / 6 Watts X 2 = 4.9 hours Tip: Get a “ USB Multimeter ” from Amazon to verify your charge rate. If you are connecting to an off the shelf battery pack, there are a number of reasons that the charge rate could be worse.
Editor's Note: Our solar charger review was updated on November 13, 2024, to give more detailed comparisons. The Jackery SolarSaga 100 once again is our favorite high-wattage solar charger. This lightweight panel is more affordable than most 100-watt solar panels and also performs as well as the best of them.
It has two USB-A outputs that can each put out up to three amps, which is enough power to charge any USB device. Roughly the size of a notebook, this solar charger unfolds into three panels and has a zippered case that can easily hold two charging cables, a battery pack, and more.
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