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Inhabitat

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February 18, 2009

SunCat: Solar Batteries Powered by Sunshine

by Mike Chino

Designer and inventor extraordinaire Knut Karlsen recently unveiled an inspired approach to portable
power that can’t be beat for its elegant simplicity: a prototype battery capable of charging itself when
exposed to sunshine. His slick set of SunCat C-cells are wrapped in flexible photovoltaic panels and
will slowly recharge when left to bask in the sun - just like a cat.

Rechargeable batteries are a boon to eco-enthusiasts who use portable electronics, however all too
often they require additional peripherals in order to keep them charged. These devices generally take
the form of a black box loaded with non-biodegradable plastics and heavy metals - not very earth-friendly.

Karlsen’s SunCat batteries circumvent chargers completely by integrating solar cells within the batteries
themselves. To make these prototypes he attached 1.8V flexible photovoltaic cells onto 1.5V NiMH rechargeable
batteries and connected them with a conductive silver pen and a few flat wires. The effect is similar to a trickle
charger, which slowly charges a battery and can be left attached indefinitely without overcharging.

Karlsen plans to continue to tweak the batteries, adding capacitors to charge the batteries more efficiently and
electronics to check when the batteries are full. We’re excited to see the results of his testing - finally, a justification
for all those see-through gadgets with clear cases!

+ SunCat Batteries

Photos by Knut Karlsen

Via Notcot