Solar Pumps for a Greener Tomorrow

Solar Pump Savings Calculator

Interactive Solar Sizing & Savings Tool

Calculate your recommended pump capacity, required solar array wattage, and real-time monthly Sri Lankan Rupee savings compared to diesel or electricity.

Real-Time Engineering Model

Configure Your Farmland Parameters

Adjust the sliders below to see your customized equipment sizing and payback timeline.

Farm Water Specifications

Pumping Depth / Total Head: 30 m (98 ft)
10m (Surface/River) 60m (Borewell) 120m (Deep Well)
Daily Water Requirement: 25,000 L/day
5,000 Liters 40,000 Liters 80,000 Liters
Calculations are based on 6.5 average Sri Lankan peak sunshine hours and current commercial diesel/electricity tariffs.
Optimal Solar Engineering Recommendation

2.0 HP High-Yield Solar Submersible Pump

2,400 W Solar Array (5 x 550W Tier-1 Panels)

Estimated Monthly Fuel Savings
LKR 48,000
Saved directly in your pocket each month!
5-Year Cumulative Savings LKR 2,880,000
Estimated Payback Period ~13 Months
CO2 Emissions Eliminated 4.5 Tons/Year
Electricity / Fuel Bill LKR 0 / Forever
Request Official Proforma Invoice for This System Send Configuration via WhatsApp

Financial Comparison

Why Solar Beats Diesel & Grid Electricity

A clear, transparent breakdown of lifetime ownership costs.

Key Evaluation Criteria Lanka Sunrays Solar Traditional Diesel Pump CEB National Grid Pump
Monthly Running Cost LKR 0 (Zero Fuel or Bills) LKR 45,000 – 120,000+ / mo High monthly tariff bills
Reliability During Outages & Shortages 100% Independent (Runs daily) Vulnerable to fuel queues & rationing Power cuts stop irrigation immediately
Daily Operational Effort Fully Automatic (Starts at sunrise) Manual fueling, cranking & watching Manual switch on / switch off
Routine Maintenance Near-Zero (Occasional panel rinse) Frequent oil, filter & spark plug changes Motor capacitor burnouts from low voltage
Equipment Lifespan & Warranty 25-Year Performance Guarantee 2 – 4 Years before major overhaul 3 – 5 Years (Phase surge risks)

Understanding Hydraulic Sizing Calculations

Solar water pump sizing depends on the total dynamic head (TDH), which includes:

  • Static Water Lift: The vertical distance from the water table down in your well to the ground surface.
  • Elevation Lift: The vertical distance from the ground surface to your storage tank inlet or highest crop point.
  • Pipe Friction Losses: Pressure drop created by water moving through pipes, elbows, and valves (typically ~10% of total head).

Our technical teams calculate hydraulic energy based on $E_{hyd} = \frac{\rho \cdot g \cdot V \cdot H}{3600 \cdot 1000}$ (kWh/day), ensuring your pump is neither undersized nor wasting excess solar panel capacity.

Average Peak Sun Hours (PSH) in Sri Lanka

Province / ZoneAverage Daily Peak Sun HoursIrrigation Window
North Central (Anuradhapura/Polonnaruwa)6.5 – 7.2 Hours7:30 AM – 4:30 PM
Northern (Jaffna/Kilinochchi/Mannar)6.8 – 7.5 Hours7:00 AM – 5:00 PM
North Western (Kurunegala/Puttalam)6.2 – 6.8 Hours8:00 AM – 4:30 PM
Southern Dry Zone (Hambantota)6.5 – 7.0 Hours7:30 AM – 4:30 PM
Central Hill Country (Nuwara Eliya/Badulla)5.0 – 5.8 Hours8:30 AM – 3:30 PM