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Why is my power bank taking so long to charge?

Steven Mulqueen

With portable power banks having such large battery capacities, they can often take a long time to charge up, but sometimes it seems to take far too long!

The charging speed for a power bank is affected by several different factors, but the limiting factor is the power banks maximum input current. For example, the SunSaver Classic’s maximum input current is 2-Amps and the SunSaver 10K’s is 3-Amps.

But the equipment being used to charge the power bank also affects the charging rate. Because charging a power bank requires a USB power source along with a charging cable, the maximum charging rate is equal to the lowest Amp rating of any of the components.

For example, if you’re charging a SunSaver 10K with a USB cable rated to 2-Amp and a power source rated to 0.5-Amp, then the maximum charging rate is going to be 0.5-Amps. This means it will take approx. 6 times longer to charge than if you were using components all rated to 3-Amps (the SunSaver 10K’s maximum input current).

So, to minimise the charging time when charging from a wall socket or your vehicles 12-Volt power supply, make sure that all your charging components are rated to the same Amps, or higher, of your power banks input.

Although SunSaver power banks do feature their own solar panels for trickle charging in the sun, the small size of the solar panel compared to the large battery makes this a relatively slow way to charge. But to turbo boost the solar input, USB solar chargers, such as the SunSaver Power-Flex, can be plugged in to charge them much quicker.

The speed at which the solar charger will charge the power bank is dependent on the solar charger’s power rating and the weather conditions. To maximise solar input, it is recommended to place the solar panels in direct sunlight, angled at the sun.


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