Our experience with the solar chargers is that they're more trouble than they're worth.
Running electrical power is pretty simple if you're the least bit handy, but I'd run them underground in conduit. You'll need a path for the new wiring from an existing power source (service panel, an existing duplex receptacle, light switch, etc). Make sure to match your wire gauge to the circuit's breaker (12ga wire for 20A, 14ga wire for 15A).
We ran underground power to our shed and coop in less than a day off an added/dedicated breaker in our home's service panel. It's NICE to have electrical power at the coop for MANY reasons!!!