How to Set Up a Solar Water Pumping System: Installation Guide

Installing a solar water pumping system correctly is critical for reliable, long-term operation. This guide covers the practical installation steps for both direct-drive and battery-backed solar pump systems used in agriculture and domestic water supply across the Middle East and Africa.

Pre-Installation Checklist

• Water source confirmed (borehole depth, static water level, yield test completed)
• Daily water requirement calculated (litres or cubic metres per day)
• Pump selected and matched to head height and flow rate requirements
• Solar array sized (1.3x pump power for direct drive, or full system calculation for battery-backed)
• All components on site and tested

Direct-Drive Installation

Step 1: Install the Pump

For submersible pumps: lower into the borehole on safety cable with discharge pipe. Ensure the pump sits at least 3 metres above the borehole bottom and below the dynamic water level during pumping.

Step 2: Mount Solar Panels

Install on ground-mount or pole-mount structures facing south (northern hemisphere). Tilt angle: equal to your latitude for year-round optimisation (20-25 degrees in the Middle East).

Step 3: Wire the Pump Controller

1. Mount the pump controller (VFD/solar pump inverter) in a shaded, ventilated enclosure near the panels
2. Connect solar panel strings to the DC input terminals
3. Connect the pump cable to the AC output terminals
4. Connect the water level sensor (prevents dry running)
5. Configure pump parameters: maximum flow, pressure set point, dry-run protection delay

Step 4: Install Piping

Pipe Diameter	Maximum Flow Rate	Application
32mm (1.25 inch)	3 m3/h	Small domestic / garden
50mm (2 inch)	8 m3/h	Medium farm / livestock
75mm (3 inch)	20 m3/h	Large irrigation
100mm (4 inch)	40 m3/h	Commercial irrigation

Include a check valve to prevent backflow and a pressure gauge for monitoring.

Battery-Backed Installation

For systems using a Felicity IVPS inverter with battery storage:

1. Install the Felicity IVPS inverter and battery bank as per standard off-grid system guidelines
2. Connect the pump to the IVPS AC output (ensure inverter surge rating exceeds pump start current)
3. Connect solar panels to the IVPS MPPT input
4. Configure the IVPS for solar-priority mode
5. Set a timer on the pump to run during optimal hours

Commissioning Tests

1. Measure solar array Voc before connecting — verify within controller limits
2. Start the pump and measure flow rate with a bucket and stopwatch
3. Monitor pump current draw and compare to specifications
4. Check water level sensor triggers dry-run protection correctly
5. Run the system for 2-3 hours and verify consistent flow and pressure
6. Record initial performance data as baseline for future comparison

Common Installation Mistakes

• Undersized pipe: Creates back-pressure that reduces flow rate and overworks the pump
• No check valve: Water drains back into the well when the pump stops, requiring re-priming
• Panel strings too long: Exceeding the controller's maximum input voltage can damage electronics
• No dry-run protection: Running a submersible pump without water causes motor burnout in minutes
• Pump too deep: Submersible pump should not sit on the borehole bottom where sediment collects