I'm sorry if this isn't the right place for a shopping question, but I'm not sure where else to go for advice. I got a https://www.amazon.com/MELNOR-4-Zone-Digital-Water-Timer/dp/B0094KM4VK on sale and the unit is great, but the batteries don't hold a charge very well, especially when using rechargeables - it can register low batteries after only a week. I'd like to rig up a solar panel to the timer that will keep the batteries charged and reduce or eliminate the need for me to check on it every few days. The timer runs on 2 AA batteries, ~3v. Does anyone know of an existing solar charger & 3v power supply that I could use to run this timer? What I'm looking for is a complete integrated solution that is weather proof and fairly inexpensive. I'd like to find an existing solar power supply that charges its own batteries and regulates the voltage to an independent 3v load. Something I could just mount on the wall and run the wires to the timer and be done with it. Of course, if I do a search for anything "solar charger" or "solar power supply" related, I'm inundated with cell phone chargers (which are all ~5v). I don't really have the time right now for a DIY project and anything I build would not be very weather resistant. But if there's no premade solution, then I can probably sort it out. This device from adafruit would be good, except that it's "some assembly required" and its output is ~6v and I need 3v; adding a step-down to drop the voltage would just add to the cost and complexity that I would rather avoid.