My obsession with portable solar energy continues — in the past I’ve written about Suntrica’s portable chargers, Reware’s Juice Bags and Noon Solar’s range of bags. Suntrica’s chargers, though difficult to purchase outside Finland, currently offer the most elegant and practical solution for cheap, mobile and clean solar energy.

Interestingly, a unique field test of mobile solar power is taking place in a handful of African nations, where electrical power is often unreliable: AfriGadget’s Flexible Light And Power (FLAP) initiative.

FLAP is a collaboration between San Francisco’s iconic messenger bag company, Timbuk2, the Pop!Tech conference, and Portable Light. Timbuk2 has modified one of its standard messenger bags with a removable flap that contains a photovoltaic solar panel connected to an LED light and a USB power outlet, which can be used for charging portable electronics such as phones and MP3 players.

AfriGadget’s founder, Erik Hersman, has been traveling through communities in Ghana, Kenya and Uganda, assessing the usability, usefulness and adaptability of FLAP for everyday use. So far it seems the solar-charged light is the key feature, with the bag’s built-in USB charging being less crucial. However, given the crucial cultural role that mobile communication is playing in countries such as Kenya and Uganda, I’d be surprised if this feature doesn’t become more popular.

Interestingly, Timbuk2 plan to offer the solar flap as part of their own range of accessories — bringing technology tested and evaluated in the developing world to its geek-dense customer base in the developed world.

With the popularity and utility of Timbuk2 bags among web workers, combined with the emerging interest in solar power, this seems like a great collaboration. I hope some benefit will accrue to those developing nations’ communities, and not simply to more affluent buyers elsewhere.

Would you buy a bag with a solar charger or solar accessories?

Sadly, most solar charging products — like the aforementioned Noon Solar and Juice Bags — unnecessarily bundle solar chargers with some other product, like a bag! Fortunately, standalone solar charging products are beginning to find their way to the marketplace. Some of the most intriguing are found in Suntrica’s range of SolarBadge and SolarStrap chargers.

Designed specifically for portable consumer electronics — like digital cameras, phones, MP3 players and GPS units — Suntrica’s chargers include adapters for common mobile charging connectors and USB devices and come in form factors ranging from flexible paperback-sized panels to wearable wrist-straps. Each charger holds an internal rechargeable battery, so that devices can be charged even when there’s little or no sunlight.

The chargers are priced between $40 and $70, with adapters priced individually at around $5 each — although, unfortunately, it seems that Suntrica’s products are currently only available in the company’s native Finnish market. Suntrica’s products are by no means the only portable solar chargers available today, but they look pretty durable, have some flexibility in the devices they support, and are competitively priced.

Alternatively, for the more adventurous, the fantastic Instructables site recently published a how-to guide to building a solar iPod/iPhone charger using some basic electronic parts, rechargeable batteries and a soldering iron! The component parts come to around $70, about the same as Suntrica’s high-end unit with an equivalent output, and although the project does look fun, it’s not quite as lovingly styled. It’s great to see that solar power is beginning to attract both venture-backed and grassroots-driven innovation.

I’m itching to try Suntrica’s products, so if you are using solar chargers regularly, let us know how they’re performing for you in the comments.