Electrical design and installation of solar pumps

STEP
5 
CONCLUSION OF THE CALCULATION
For this example, on the request for quotation (RFQ) we will only specify the daily water flow (30 m
3
/day) and the total 
head (70m), with the list of main components + options. Suppliers should respond with offers approximately corresponding 
to following equipment: 
• A solar submersible pump, Stainless steel AISI304, Brushless motor, rated power 1 900 W + adapted controller
• A backup power generator of 6 kVA if any, or a cabinet end line with capacity to connect a 6 kVA generator in case 
of need.
• A solar panel power of 2,6 kWp disposed on fixed stand, including a set of 8 to 11 panels depending on their 
power (8 panels of 330Wc to 11 panels of 250Wc).
EXAMPLE
It can be seen from performance tables that decreasing coefficient can be up to 30% larger than this calculation (if pump 
with a lower efficiency for example), but can not under any circumstances be less than this calculation. 
This method is therefore reliable for verification purposes. Regarding the detailed design, it is necessary to know the type 
of pump, its performance, its maximum and minimum operating voltages ... something that is generally not known at the 
stage of the quote request. We will leave it to the supplier to carry out the calculation, and engage his responsibility on it.
If you are in a context where the suppliers are not able to define the necessary equipment from the requested quantity of 
water and the total head, or if this calculation method brings results very different from technical proposals of suppliers:
> Send an email to: 
[e-mail] 
(for AAH staffs and missions only)

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SOLAR PUMPING
Guidelines - Electrical design and installation of solar pumps