Solar Water Pump for Greenhouse Irrigation: Complete Guide

The short answer: a 200–750 W solar pump with a storage tank covers nearly every greenhouse under 3,000 m². A greenhouse crop uses roughly 3–6 L/m²/day, so a 1,000 m² greenhouse needs about 3–6 m³/day — a 3.5 m³/h DC pump fills a 3–5 m³ tank in 1–2 hours of good sun, and the tank feeds your micro-sprinklers at the pressure they need (1.5–2.5 bar) whenever you open the valve. No batteries, no grid connection, no fuel.

Greenhouses are close to the ideal case for solar pumping: water demand is small, the irrigation window is flexible, and the sun that powers the pump is the same sun the crops need. Here is the full sizing process.

Step 1: How much water does a greenhouse actually need?

Crop water use inside a greenhouse is driven by evapotranspiration. Typical values for greenhouses in warm climates:

These are typical ranges — your local temperature, ventilation and season shift the number, and summer peaks can run 30–50% higher.

Daily need (m³/day) = area (m²) × water use (L/m²/day) ÷ 1,000

Example: an 800 m² tomato greenhouse at 5 L/m²/day needs 4 m³/day — less than one-tenth of what the same area of open field often needs in peak season.

Rule of thumb: most greenhouses need 3–10 m³/day total. That means a small pump, one or two panels and a modest tank — which keeps the whole system affordable.

Step 2: Pressure & head — can the pump feed micro-sprinklers?

Your irrigation method decides the pressure (head) the pump must deliver:

Total head (TDH) = well depth × 1.15 + horizontal pipe length ÷ 10 + emitter pressure head

Example: 12 m well, 30 m horizontal line, micro-sprinklers at 2 bar (20 m): TDH = 12 × 1.15 + 30 ÷ 10 + 20 = 13.8 + 3 + 20 ≈ 37 m

Choose a pump whose max head sits at least 15–20% above your TDH so the flow stays strong. For this example, the 3DPC3.8-47-48-400 (3.8 m³/h, 47 m, 400 W) or the 4DPC4.5-40-48-500 (4.5 m³/h, 40 m, 500 W) both work.

Step 3: Choosing the pump and solar panels

If your water sits at ground level — a storage tank, pond or canal — a surface pump (DQB/DZB/DJET/DCPM) is the simpler, cheaper choice; keep it within about 8 m of the water surface. For a borehole, use a submersible pump (2DPC/3DPC/4DPC/4DSC). See our submersible vs surface pump guide.

Solar panels — the 1.3× rule: panel power must be at least 1.3× the pump’s rated power (this is the rule used across our whole catalog):

Voltage (VOC) check: a 24 V pump accepts VOC below 60 V (one 550 W panel, VOC ≈ 50 V). A 48 V pump accepts VOC below 120 V (up to two panels in series). A 72 V pump accepts VOC below 170 V (up to three). Keep your string voltage under the pump’s VOC limit — the MPPT controller handles the rest.

Step 4: Tank, filter and simple automation

1. Storage tank: 1.5–3× daily need. For a 4 m³/day greenhouse, a 6–12 m³ tank lets the pump run only during sunny hours while irrigation happens any time — including at night. This removes the need for batteries entirely.
2. Filter before the sprinklers. Micro-sprinkler and misting nozzles have tiny orifices. A screen or disc filter (120 mesh is typical for drip/micro systems) protects them from sand and debris.
3. Float switch in the tank. When the tank is full, the float switch stops the pump automatically — no overflow, no wasted pumping.
4. Dry-run protection. The MPPT controller stops the pump if the water level drops too low, protecting the pump from running dry. This is standard on our DC pump systems.

Why solar suits greenhouses (the bonus)

Greenhouse cooling and solar pumping peak at the same moment: midday sun drives the pump exactly when misters and evaporative cooling need water. A solar pump feeding a misting line works as both irrigation and temperature control. And because a greenhouse needs only a few m³/day, the whole system stays compact — one or two panels, a small pump, and a tank. For the full sizing method from well to pump, see our how to size a solar water pump guide.

Not sure which pump fits your greenhouse? Message me on WhatsApp with your greenhouse size, water source and irrigation type — I’ll recommend the right system. Or use the sizing tool to match a pump to your well depth and daily volume.