But how much does a solar water pump cost in Mali? Let's break it down. Pump Capacity: Small systems (1-3 HP) cost $1,200-$3,500, while larger setups (5+ HP) range from $4,500-$12,000. Solar Panels: High-efficiency panels add 20-30% to upfront costs but improve long-term ROI. Battery Storage:. A solar water pump uses electricity generated from solar panels to pump water from a borehole, well, or river — without relying on grid power or fuel.