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Canon Chargers come in many sizes. Popular brands include Solio, Freeloader, Brunton, IceTech, Sunsei (ICP), Coleman, canon Gorilla, Energizer, iSun and SunForce. A 5 watt canon panel is the minimum practical size. Depending on the devices to be charged and the strength of the sunlight (geographical latitude, time of year, cloud cover) it just might charge. A 10 watt panel is a safer bet. 20 watt models are even better (especially for charging notebook and laptop computers) but these are heavy and expensive. Tricks to Maximize Power If the canon panel is too weak, some tricks might help: Some models can be joined together to provide more power (depends on manufacturer). A panel too weak to charge li-ion batteries at a time might charge one or two. If a cellphone or notebook refuses to charge, switching it off might help. More powerful panels might give usable power on overcast days but small units need direct sunlight. Placing the panel behind a glass window can substantially reduce the output power. A 5 volt USB socket output is useful as many of today's devices can be charged from a computer USB port (adapters might have to be purchased separately). 12 volts output through a car cigarette-lighter socket is also useful as many devices are also designed to be charged from cars. Some panels have a built-in Canon li-ion battery charger. Others attach a separate battery charger through the USB port. If not supplied with the panel, a USB battery charger can be purchased separately. Some devices may use other voltages and sockets. This should be checked before purchase. For maximum flexibility, 12 volt inverters can be used to provide mains AC voltage (110 or 230 volts) but this is only practical with 20 watt and larger panels. It also means additional weight, and loss of power due to conversion inefficiencies. Are canon Chargers Environmentally Friendly? The National Renewable Energy Laboratory reports that rooftop photovoltaic canon panels can take 3 to 4 years to recover (payback) the energy used to manufacture the cells (carbon neutral). This is with them sitting under the sun every day. It is unlikely that a portable canon charger will see this much use. The best "green" result that can be expected is that rechargeable li-ion batteries are used instead of disposable alkalines. The Best canon battery Charger More so than for other products, canon chargers might not perform as expected. Buying from a retailer with a good return policy is the safe thing to do. Most problems with chargers are caused by insufficient power. Buying the most powerful panel that is practical, will reduce potential problems.