Pump sizing calculator — industrial & solar water pumping
Estimate required flow, total dynamic head (TDH), hydraulic and motor power, VFD size, and — for solar mode — PV array kWp, panel count and optional battery buffer for agricultural irrigation, boreholes, greenhouses and pivot networks. Generate a prefilled RFQ with the calculated duty point.
Estimates Only: This calculator is provided for general informational purposes only. Results are approximate and may contain errors, omissions, or outdated information. They do not constitute legal, financial, engineering, tax, technical, or professional advice. Users are solely responsible for independently verifying all calculations, specifications, prices, regulations, and requirements with qualified professionals before making any decisions. By using this calculator, you acknowledge that the website owners, operators, and affiliates accept no responsibility or liability for any loss, damage, or decisions resulting from its use.
Inputs
Sizing results
Generate prefilled RFQ- Daily demand
- 800 m³/d
- Average flow
- 100.0 m³/h
- Peak (duty) flow
- 120.0 m³/h
Head build-up
- Static lift
- 15.0 m
- Pressure head (2.5 bar)
- 25.5 m
- Friction (15%)
- 6.1 m
- Total dynamic head (TDH)
- 46.6 m
Power & drive
- Hydraulic power
- 15.23 kW
- Shaft power (η 72%)
- 21.15 kW
- Motor (calc.)
- 26.44 kW
- Motor (standard frame)
- 30.0 kW
- VFD size
- 37.0 kW
First-pass sizing screener. Final selection requires a full hydraulic study (Hazen-Williams or Darcy-Weisbach), NPSH check, water-chemistry review and validated pump curves. SeedMatchGroup pairs your output with a normalised RFQ to qualified pump-station and solar-pumping manufacturers — supplier identities, curves and datasheets are shared through the private brokerage flow.
Frequently asked questions
- What does this pump sizing calculator estimate?
- Required peak flow (m³/h), total dynamic head (static lift + pressure + friction losses), hydraulic and shaft power, recommended motor kW with service factor, indicative VFD size, and, when solar mode is enabled, PV array kWp, panel count and optional battery buffer.
- How is total dynamic head (TDH) calculated?
- TDH = static lift (source-to-discharge elevation) + required operating pressure at the emitter / manifold (converted to metres, 1 bar ≈ 10.2 m) + friction losses along pipework. Friction is estimated from an assumed head-loss percentage on the pipe run; final selection requires a Hazen-Williams or Darcy-Weisbach hydraulic study.
- How is motor / VFD size derived?
- Hydraulic power (kW) = (Q × H × ρ × g) / 3.6e6, with Q in m³/h and H in m. Shaft power = hydraulic ÷ pump efficiency. Motor kW = shaft ÷ motor efficiency × service factor (typically 1.15). VFD is sized to the next standard frame above motor kW.
- How is the solar PV array sized?
- Daily water demand × hydraulic energy per m³ gives daily energy at the pump shaft. Dividing by peak-sun-hours and inverter/wire losses yields required PV kWp. Battery buffer, if enabled, sizes lithium capacity to cover a set number of no-sun operating hours at the pump's average duty.
- Is this a bankable engineering study?
- No. It is an early-stage sizing screener. For tenders, EPC contracts, or financing, SeedMatchGroup pairs the output with a full hydraulic and electrical package and a normalised RFQ to qualified pump-station and solar-pumping manufacturers.