DOYIN 4SDM3/7 0.5HP Single-Phase AC Submersible Pump — 1.25" Outlet

The DOYIN 4SDM3/7 is DOYIN's entry-level single-phase AC submersible pump, built with an ordinary impeller for shallow domestic wells and boreholes. With a 1.25-inch outlet and a flow rate of 4.8m³/h (4,800 litres per hour), it delivers reliable performance for a recommended depth of up to 45 metres, with a maximum head of 50M — a compact, budget-friendly option for basic household water needs.

Running on standard single-phase AC power, the 4SDM3/7 is a practical option for properties without three-phase supply — common across many residential sites in coastal Kenya. It fits domestic wells, household water points, and general home water supply needs in Mombasa, Malindi, Diani, Kilifi, and Lamu. This model is also available with a factory-fitted 30m cable option for easier installation on suitable wells.

As a single-phase AC pump, the 4SDM3/7 requires a matching AC controller (DOYIN's DYM-S03 unit) sized to its 0.5HP rating for correct, protected operation. Note that this is a grid/generator-powered pump — it is not solar-compatible. For solar-powered options at similar wattage, DOYIN's DC pump range (such as the 3SDS4-400W) is the correct choice instead.

CoastalSolar Africa supplies, sizes, and installs the 4SDM3/7 pump, including the correctly matched DYM-S03 controller, across the coastal region.

Specifications:

• Model: 4SDM3/7
• Power: 0.5HP, single-phase AC
• Impeller: Ordinary
• Outlet size: 1.25 inches
• Max flow: 4.8m³/h (4,800L/h)
• Max head: 50M
• Recommended depth: 0–45M
• Power source: Single-phase AC (grid or generator) — not solar-compatible
• Required controller: DOYIN DYM-S03 AC controller
• Cable option: Also available as 4SDM3/7+30m Cable variant
• Application: Domestic wells, household water points, home water supply

FAQs:

Is this a solar pump?
No — the 4SDM3/7 is a single-phase AC pump requiring standard grid or generator power. If you need a solar-powered pump at a similar power level, ask about the DOYIN 3SDS4-400W DC pump instead.

What controller does this pump need?
It requires the DOYIN DYM-S03 AC controller, specifically matched to this model — CoastalSolar Africa can supply and fit this correctly.

Is there a version with the cable already included?
Yes, DOYIN offers a 4SDM3/7+30m Cable variant with a factory-fitted cable for easier installation.

How does this compare to the 4SDM3/10 (0.75HP)?
Both use the same DYM-S03 controller, but the 4SDM3/10 reaches slightly greater depth (64M vs 45M recommended) at a higher 0.75HP rating — the 4SDM3/7 is DOYIN's most compact and affordable AC pump option.

Do you install this pump in Kilifi and Malindi?
Yes, CoastalSolar Africa supplies and installs the 4SDM3/7 pump with its matched controller across Mombasa, Malindi, Diani, Kilifi, Lamu, and the wider coastal region.