Hey Mr Faulty
You'd want to look for a USB input charger, depending on what your camera brand/model is. There are a few "universal" chargers out there so you can move the +/- terminals to fit your camera's batteries if they don't make a specific USB input version. Check with local Camera stores if you don't have time before your trip.
Some universal chargers
http://www.digitalcamerawarehouse.com.au/prod13671.htmhttps://www.cambuy.com.au/products/inca ... sb-deviceshttps://www.amazon.com/Neewer-Battery-C ... B00ZHJ8TH0 or
https://www.amazon.com/dp/B0057R2ZJA for Canon LPE6 DSLR batteries
http://www.lightinthebox.com/kingma-dua ... 35369.html or
http://www.lightinthebox.com/kingma-dua ... 80900.html for Nikon DSLR Batteries.
(NOTE I am not endorsing any of the above shops - they were just in the first few results from Google search. I have one of the Inca universal battery chargers, and another unbranded USB charger for my old Nikon DSLR)
For the solar side, I have taken a number of my panels overseas to directly charge devices and charge powerbanks. Charging while walking is not efficient and some devices/chargers/panels will not restart charging when the panel is shaded. Charging when stationary at camp is much more efficient, but you will do better if you also need to move the panel to face the sun as it rotates.
If you get a solar panel with USB output, you can use it in conjunction with the USB input on the abovementioned charger.
That said, I recommend that you get a good quality powerbank, which you can use a solar panel to recharge first, and then use the power bank to charge the batteries when required, and then you can also recharge your camera batteries at night.
madmacca wrote:Batteries are generally quoted in mAh at 3.7V, so your camera battery would be the equivalent of 2400 mAh at 3.7V.
Most DSLRs still do not use USB inputs for charging (usually only for PC connectivity), due to the different battery voltages. Smaller digital cameras do indeed use 3.6V-3.7V lithium batteries, but AFAIK DSLRs still use batteries ranging between 7.2V - 7.4V.