6 of the best solar-powered chargers for smartphones and tablets (and one nifty keyboard)

Powertraveller Powermonkey eXtreme

A solar unit that takes about 14 hours to charge up (and works even under overcast skies), this 9,000mAh capacity battery (HK$1,490) can output to a smartphone and tablet. A Powermonkey Aquastrap accessory makes the two units waterproof while in charging position.

Available at oasistech.com.hk

Great for camping trips and outdoors activities, this solar-powered lantern, flashlight and portable charger (HK$271) contains a 4,000mAh portable battery that’s good for fully recharging a

phone.

Available at hybridlight.com

A regular portable battery supplied with a separate solar panel, this dual device (HK$1,320) contains a built-in microUSB cable, so it’s perfect for Android devices. The 7,800mAh battery is water resistant, making it good for use outdoors.

Available at goalzero.com.

Ideal for camping, this superslim solar panel (HK$1,295) has a small sundial in the corner that together with a stand makes it easy to aim at the sun to maximise power generation. It includes a built-in 2,200mAh battery that’s good enough to top up a phone battery.

Available at overlander.com.hk.

Logitech K750R wireless solar keyboard

For those out in the wild wanting to write using a phone or tablet, this wireless keyboard (HK$539) uses a built-in solar panel to stay charged for at least three months. Available at yohohongkong.com.

If you plan to go off-grid for weeks at a time and need to recharge phones, tablets and laptops several times over, this generator (HK$3,658) has an enormous 145Wh lithium battery inside. Also contains a flashlight and an SOS beacon light. Available at http://prubuy.hk.

Voltaic solar backpack

Perfect if your commute involves a long walk, this backpack (HK$1,545) with a 6W solar panel will trickle-charge a phone, tablet or camera. The solar panel is removable, and the bag also includes a padded laptop sleeve. Available at voltaicsystems.com