After initially looking at portable USB power supplies to charge the various devices, I came across solar charged power packs, for a decent price.
Each of the above devices (apart from the 50d) can recharge off regular USB power, which can be provided by a portable USB supply, or a solar charged battery. The 50d could also be possibly be charged this way with a small voltage step-up circuit, as 8.4volts is required, rather than 5v/USB power.
The devotec and solio both charge to full in 6-12 hours depending on sunlight whereas the Freeloader can charge in under 4hours (also due to a lower capacity battery). I decided on the devotec due to price and battery life.
Each of the above devices (apart from the 50d) can recharge off regular USB power, which can be provided by a portable USB supply, or a solar charged battery. The 50d could also be possibly be charged this way with a small voltage step-up circuit, as 8.4volts is required, rather than 5v/USB power.
The devotec and solio both charge to full in 6-12 hours depending on sunlight whereas the Freeloader can charge in under 4hours (also due to a lower capacity battery). I decided on the devotec due to price and battery life.
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