PS2-150 CSJ5-8 pump with 1 panel. This is an ideal system for reasonably large volumes at low head. The pump can be run on as little as one 12volt panel, but in this scenario has 1 of 200Watt panel.
In the diagram below, 1m3 = 1000 litres, so at 7m head, system can pump on average around 19,000 litres per day.
