I received an email today from Camtraptions announcing the flashes now have a solar adapter for topping off and charging the "in flash" rechargeable batteries (and trigger) or for recharging the optional NiMH external battery pack. The email included a video of the updates. This of course assumes a camera trap is getting direct sunlight in the daytime hours.

https://www.youtube.com/watch?v=8nX3elzbFp8