@ben thanks for the kind words! the energy from the sun, at least at the moment, is more than enough. so far it's a mild, cloudy summer in berlin, germany. it's hard to say exactly, but roughly 4 hours of charging can sustain it for 36 hours. and regarding the ip address: there are dyndns update calls in regular intervals, so the domain name will always resolve to the current address. the isp does not change the ip usually, but it does not guarantee a fixed address.