Cost of solar and diesel pumps:
A cost comparison was conducted for solar and diesel water pumps over a range of pumping heads (10 to 200m) and a range of daily flow rates (3 to 50m3/day). The all-inclusive costs were calculated taking into account. The initial upfront cost, the operating costs (diesel fuel for the operating life), maintenance costs, and replacement costs (diesel engine, solar submersible pump unit etc).Calculating the all-inclusive cost is a fair way of comparing solar pumps (usually higher upfront cost) with a diesel pump (usually lower upfront cost, but with ongoing diesel and intensive maintenance costs). The all-inclusive cost takes a long term approach and is calculated over a twenty year period, which is also the minimum life expectancy of a solar panel. The cost comparisons show that diesel pumps are on average two to four times more expensive over a 20 year period than solar pumps for pumping the same average amount of water per day! Refer to costing approach in final report for more detailed information.
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