We have four 450 watt panels and a 2 inch pump.
We can pump something like 20 cubic meters of water per hour.
The pump we had before this one was a 1 and a halve inch and it is still running well but in another part of the land.
The first pump we bought we were told we needed a converter and a battery.
That was total bs,the converter just tried to maintain a certain voltage but for DC that is not needed.
When we did use that we also needed a battery and i just installed an old motorbike battery,the battery was needed to complete the circuit.
Thaiwatsadu is not cheap with panels,there are better places to buy your equipment and other places actually do have knowledge.
We paid for the pump and four panels a total of 23500 baht.
We live in an oasis here,all is green around us.