@Turnerb, the goTenna MESH charges at around 250 mA, which is at rate of around 0.4C (C = Capacity). Most solar panels are capable of above 500mA. So given a decent solar panel and couple hours of sun, goTenna will be juiced up again. And since the unit is designed to last 24 hours with a fully charged battery, it should last through the night to be recharged again the next day.