Solar Irrigation — Transforming Kenyan Agriculture
Irrigation is the single most transformative investment available to a Kenyan farmer — it converts rain-dependent, seasonal production into year-round, reliable crop supply. But diesel-powered irrigation has historically been expensive, unreliable, and logistically challenging. Solar irrigation eliminates diesel entirely, delivering water whenever the sun shines at zero fuel cost.
Vajra Drill designs and installs complete solar irrigation systems — integrating the water source (borehole, river, or dam), solar pump system, distribution network (drip lines or sprinkler risers), filtration, and control automation. As both a borehole drilling company and a solar energy provider, we uniquely understand every component of the system from groundwater to crop root zone.
Our solar irrigation systems are working across Kenya: cut-flower farms in Naivasha, vegetable horticulture in Mwea, mango orchards in Makueni, and smallholder food crop projects across Central and Eastern Kenya. The common outcome is the same: year-round production, reduced water use (drip irrigation uses 40–60% less water than flood irrigation), and dramatically reduced or eliminated diesel costs.
Solar Irrigation Services
Solar Drip Irrigation Systems
Drip irrigation delivers water directly to the plant root zone through drip emitters on lay-flat drip tape or drip lines — minimising evaporation, reducing disease pressure, and enabling fertigation (fertiliser delivery through the irrigation water). Solar pumps from boreholes or reservoirs power drip systems for vegetable, flower, fruit, and greenhouse production. We design systems for plots from 0.1ha to 500ha+.
Solar Sprinkler Irrigation Systems
Overhead and semi-portable sprinkler systems for pasture, fodder crops, nurseries, and turf irrigation. Solar-powered centrifugal or turbine pumps feed overhead sprinkler networks or rain-gun systems. Variable-speed solar controllers allow the system to operate at reduced capacity during lower-irradiance periods rather than stopping, maximising the irrigation window each day.
Variable Speed Solar Pump Controllers
Advanced solar pump controllers (Lorentz PSk3, Grundfos CU301) regulate pump speed in real time to match available solar power — ensuring the pump always runs at optimum efficiency regardless of cloud conditions. Integrated float-switch, tank-level sensor, and dry-run protection ensure fully automatic operation with no supervision needed. GSM monitoring for remote pump status alerts.
Irrigation Automation & Scheduling
Timer-based and soil-moisture-sensor controlled irrigation scheduling ensures crops receive exactly the right amount of water at the right time — preventing over-irrigation, under-irrigation, and the yield losses associated with both. Automation is especially valuable for farms where skilled irrigation labour is expensive or unreliable. We install Galcon, Rain Bird, and Hunter control systems.
Fertigation & Filtration Systems
Drip irrigation enables precise liquid fertiliser application directly to the root zone through the irrigation water — achieving higher fertiliser efficiency and reducing costs. We design and install fertigation systems with Venturi injectors, fertiliser tanks, and automated dosing pumps. Sand, disc, and screen filtration protects drip emitters from blockage — critical for system longevity.
How We Install Your Solar Irrigation System
A solar irrigation system integrates water source, solar pumping, and distribution infrastructure. Our end-to-end process delivers a complete, working system.
- 1Farm Survey & Water Demand Assessment
We map the farm area, identify crops and irrigation method, calculate peak crop water requirement (mm/day), and measure or estimate the available water source yield — borehole, dam, or river intake.
- 2System Design
Pump, solar array, storage tank, mainline, sub-main, and lateral pipe sizes are all hydraulically designed as an integrated system. Drip emitter spacing and sprinkler head selection are specified for your crop type and soil.
- 3Water Source Preparation
Borehole pump is installed or river/dam intake screen and filter pit is constructed. Rising main and header pipe from source to field storage tank is laid and connected.
- 4Solar Panel Mounting & DC Wiring
Panels are mounted on ground frames at the pump station at the optimum tilt. DC cabling to the MPPT controller or VFD is installed in UV-rated conduit. Controller is configured for automated operation.
- 5Irrigation Distribution Installation
Mainline, sub-main, and lateral pipes are laid and connected. Drip lines or sprinkler heads are installed at designed spacings. Filters, pressure regulators, and fertigation venturi are fitted in the pump station.
- 6System Test, Calibration & Farmer Training
Full system test confirms flow rates, pressures, and emission uniformity meet design. Automation timer or controller is programmed. Farmer/manager is trained on daily operation, filter cleaning, and seasonal adjustments.
Agricultural Sectors We Serve
Cut Flowers
Solar drip systems for Naivasha and Rift Valley flower farms — consistent pressure and flow critical for quality
Vegetables & Horticulture
Year-round French beans, tomatoes, capsicum and leafy vegetables with drip irrigation from boreholes
Fruit Orchards
Solar drip for mango, avocado, citrus and passion fruit farms throughout Eastern and Central Kenya
Greenhouse Production
Controlled-environment solar-powered drip irrigation for high-value greenhouse crops
Smallholder Farms
Affordable 0.1–2ha solar irrigation packages for food security and income generation
Fodder & Pasture
Solar sprinkler systems for dairy farmer fodder production and livestock grazing management
Frequently Asked Questions
Yes. Drip irrigation typically requires 0.5–2.0 bar operating pressure. Solar submersible pumps can generate 3–10 bar at the surface — more than sufficient for drip irrigation after accounting for pipe friction and elevation. In some flat-terrain applications, gravity from an elevated solar-filled storage tank can provide adequate drip pressure without any pump during water application, further simplifying the system.
Farm size depends on water source yield, solar pump flow rate, crop water demand, and whether irrigation is continuous or zone-rotational. As a guide, a 2kW solar pump delivering 5 m³/hour can irrigate approximately 2–5 hectares of drip-irrigated vegetables with daily scheduling. Larger farms simply require higher-capacity pumps and more solar panels. We carry out a full agronomic water balance calculation before specifying your system.
Solar irrigation systems can draw from boreholes (submersible pump), rivers and streams (surface suction pump or floating pump), open reservoirs and dams (floating solar pump), and elevated storage tanks (gravity drip with no pumping during irrigation). Each source type requires a different pump configuration. Vajra Drill's borehole drilling experience makes us especially capable when groundwater is the primary source.