 This is a PV powered power pump, there's no charge control or battery, the PV is going directly into a windscreen water motor Which is the entire and the fellow's pump that I made from a Dispitton and some bike energy rubber It's 18 volts coming off the panel down to about the 30 and 40 volts of the motor pump It's supposed to be doing 1 liter per second or 1 liter per stroke of air times 2.5 strokes per second I don't know if it feels like less than that It should be, it should be that much There's just little, if you can see, little valves in there that I made from aluminium plates or where you can use a lot more of this steel can and a circle of wood to do a thing on how to make those It's powering down now because the sun's going behind the cloud But other than that, it works pretty good This has cost me about, well the panel was free because the glass is all smashed You can see it there, look at that for free The biscuit tin was free obviously, the windscreen wiper motor was free because the Wreckers gave it to me for free for some reason So I paid $5 for the diodes about the same for the PVC fittings and everything else was free and just not some bolts and stuff So if you were to pay for everything all up, not including the panel that would cost you about $20 I guess And this is a 120 watt panel which is like, just because that's what I got free This is drawing about 14 volts on the motor times about 2 amps So a 30 watt panel will do the same, will power it just as well Yeah