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Pump sizing calculator

Find the right solar pump for your site

Enter your postcode, water needs and pumping details. We use local solar data, your pipe details and real pump performance figures to find the kits that suit your site.

  • Real pump performance figures
  • Location-based solar data
  • Australia-wide sizing
1
Enter your site details
Tell us where the pump will operate and how much water you need.
Location & demand
L/day
A beef cow drinks about 50–70 L a day in summer.
Water source & pumping details
m
From the top of the bore to the bottom.
m
From the top of the bore down to the water. Sent with your quote request.
L/hr
How much water the bore can supply, from the bore log.
m
Height from the bore or pump up to the tank or outlet. Use 0 if level.
Pipe
m
From the bore to the tank or irrigation.

Results are indicative. Every system is confirmed by our team.

Where the head comes from

2
Results & solar data
Local solar resource and your pump duty point.
Duty point
–
– L/min at – m head

–

Sun hours
–
Water per day
–
Lift + elevation
–
Friction loss
–
Outlet pressure
–
Kits that fit
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Solar data supplied by NASA POWER.

Matching kits

Kits whose performance meets your duty point. Closest fit first, all brands. Daily output is for an average day and is reduced in winter.

Request a quote

Send this sizing to our team. We'll check the duty, confirm the kit and come back with a price.

Your details will be used to respond to this enquiry. Privacy policy.

How this is calculated
  • Total head = total bore depth (or suction lift for a dam, river or tank) + elevation + pipe friction + outlet pressure.
  • Outlet pressure depends on the application: 100 kPa for filling a tank, 250 kPa for irrigation (1 kPa = about 0.102 m of head).
  • Pipe friction: Hazen-Williams on the pipe's actual bore, with no extra allowance for fittings. HDPE is PE100 PN12.5 (C = 150), for example 20 mm has a 17.0 mm bore. PVC is PN12 (C = 150); 80 and 100 mm bores are approximate.
  • Sun hours: NASA POWER year-round average 2001–2025, for a north-facing panel tilted at your latitude, on a 1° grid (about 100 km). Your postcode uses its nearest grid point; large postcodes use their lowest one.
  • Flow needed = water per day ÷ (year-average sun hours × 60). Output is lower in winter, when there are fewer sun hours.
  • Kit performance: flow-at-head figures from each kit's sizer figures in our store, supplied by Land & Water and the pump makers. Read between figures, never beyond them. Below the lowest figure the flow at that figure is used (never more).
  • Head allowance: a kit can still be shown if your total head is up to 5% past its last published figure. It is marked "Near its limit", uses the flow at that last figure (shown as "up to"), and may deliver less. Our team confirms these.
  • Each kit's working point is where its curve meets your system: total head rises with flow because of pipe friction. Kits are listed closest fit first.
  • Daily output = working flow × 60 × year-average sun hours for your postcode.
  • Bore yield (if given) is checked against the flow needed and each kit's working flow. Kits are not hidden; a note is shown.
  • Static water level is for information only and is sent with your quote request.

Results are indicative and for selection only. Bore yield, water quality, cable runs and site conditions all affect the final choice, so every system is confirmed by our team before purchase.