DOYIN 3SDS4-400W (0.5HP) DC Solar Submersible Water Pump — 1" Outlet

The DOYIN 3SDS4-400W is a compact 0.5HP DC solar submersible pump, DOYIN's entry-level model, built for boreholes and wells up to 42 metres recommended depth (55M max head), delivering up to 4,000 litres per hour through a 1-inch outlet. It's a practical starting point for households, small farms, and poultry units needing a straightforward, low-cost off-grid water solution.

This model runs on a DC voltage range of 65–100V, requiring just 2 solar panels wired in series (2 x 300W, roughly 600W array) to reach the correct operating voltage — the smallest and most affordable panel setup in the DOYIN DC pump range. It's well suited to smaller coastal properties in Mombasa, Malindi, Diani, Kilifi, and Lamu where budget and simplicity matter as much as reliability.

As a direct DC solar pump, it needs no batteries for daytime operation — water flows as soon as the sun is up, keeping the system low-maintenance for coastal boreholes, beach properties, and rural homesteads facing unreliable grid power.

CoastalSolar Africa supplies, sizes, and installs the 3SDS4-400W pump with the correct panel configuration for your borehole depth and site conditions across the coastal region.

Specifications:

• Model: 3SDS4-400W
• Power: 400W (0.5HP)
• Outlet size: 1 inch
• Max flow: 4.0m³/h (4,000L/h)
• Max head: 55M
• Recommended depth: 0–42M
• Voltage: DC 65–100V
• Ideal power / panel requirement: 2 x 300W solar panels (600W array, wired in series)
• Power source: DC direct-drive solar (no batteries required)
• Application: Boreholes, shallow wells, domestic and small farm water supply

FAQs:

How many solar panels does the 3SDS4-400W need?
This pump is rated for 2 x 300W panels (roughly 600W total), wired in series to reach its 65–100V DC operating range — the smallest panel setup in the DOYIN DC pump range.

How does this compare to the 3SDS4-600W?
The 3SDS4-600W is the next step up — 0.75HP with a deeper 58M recommended depth and higher flow (also 4,000L/h max), using slightly larger 2 x 410W panels.

What depth can this pump handle?
It's rated for a recommended depth of 0–42M, with a maximum head of 55M — suited to shallower boreholes and wells.

Do I need batteries for this pump?
No — it runs directly off solar panels during daylight hours. Batteries are optional if you need water access after sunset.

Do you install this pump in Kilifi and Malindi?
Yes, CoastalSolar Africa supplies and installs across Mombasa, Malindi, Diani, Kilifi, Lamu, and the wider coastal region, including correct panel sizing on-site.