The Omnicharge is very versatile in its options for charging and can be charged by all portable USB/DC solar chargers.
Most solar chargers provide a USB outlet that you can use with Omnicharge's complimentary USB cable.
Some solar chargers also provide an unregulated DC outlet, this is the most efficient way to charge your Omnicharge through solar via Maximum Power Point Tracking technology(MPPT). The Omni 13 can charge at up to 34W, and the Omni 20 can charge at up to 45W depending on the wattage of your solar panel and weather conditions. You may need an adapter tip to be able to connect with your Omnicharge's5.5 X 2.1mm barrel DC port.
A 50W unregulated DC solar panel with an Omnicharge