What about using a inverter to power a 120v pump. Solar cells charge the car
battery, inverter changes 12VDC to 120 VAC to run the pump. Simple and you
can use common pond pumps.
Paul

"DavidM" wrote in message
...
I can't find much via google on serious 12 volt pond pumps. Are there any
r.p.m readers using one, or know of one that can pump suitable volumes for
use in a 5000+ litre pond?

I'm interested to know the power requirements and feasibility of running
from a car batter charged by photovoltaic panels. The price of solar
panels seems to be dropping all the time, and with energy costs going up
it might be worth looking into.

David