DOYIN 4SDM3/40 4HP Single-Phase AC Submersible Pump — 1.5" Outlet

The DOYIN 4SDM3/40 is a heavy-duty 4HP single-phase AC submersible pump with an ordinary impeller, built for deep boreholes. With a 1.5-inch outlet and a flow rate of 4.8m³/h (4,800 litres per hour), it delivers strong lifting capacity — rated for a recommended depth of up to 255 metres, with a maximum head of 287M, suiting boreholes well beyond the reach of standard domestic pumps.

Unlike the 3-phase 4SD3/40 model of similar spec, the 4SDM3/40 runs on standard single-phase AC power, making it a practical option for properties without three-phase supply — common across many residential and small commercial sites in coastal Kenya. It fits deep domestic boreholes, community water points, and small-to-mid commercial water supply needs in Mombasa, Malindi, Diani, Kilifi, and Lamu.

As a single-phase AC pump, the 4SDM3/40 requires a matching AC controller (DOYIN's DYM-S04 unit) sized to its 4HP rating for correct, protected operation. It is not solar-compatible in this configuration and is best suited to properties with stable single-phase grid or generator power.

CoastalSolar Africa supplies, sizes, and installs the 4SDM3/40 pump, including the correctly matched DYM-S04 controller, across the coastal region.

Specifications:

• Model: 4SDM3/40
• Power: 4HP, single-phase AC
• Impeller: Ordinary
• Outlet size: 1.5 inches
• Max flow: 4.8m³/h (4,800L/h)
• Max head: 287M
• Recommended depth: 0–255M
• Power source: Single-phase AC (grid or generator)
• Required controller: DOYIN DYM-S04 AC controller
• Application: Deep domestic boreholes, community water points, small commercial water supply

FAQs:

Does this pump run on solar power?
No — the 4SDM3/40 is a single-phase AC pump requiring standard grid or generator power. For solar-powered options, ask about DOYIN's DC or hybrid AD pump range.

What controller does this pump need?
It requires the DOYIN DYM-S04 AC controller, specifically matched to this model — CoastalSolar Africa can supply and fit this correctly.

How is this different from the 4SD3/40 (3-phase)?
Both share the same flow, depth, and outlet specs, but the 4SDM3/40 runs on single-phase power while the 4SD3/40 requires a three-phase supply — choose based on what power supply is available at your site.

Should I choose this over a stainless steel model?
The 4SDM3/40 uses an ordinary impeller. If your borehole water has higher salinity or mineral content, a stainless steel equivalent may offer better long-term durability — CoastalSolar Africa can advise based on your water quality.

Do you install this pump in Kilifi and Malindi?
Yes, CoastalSolar Africa supplies and installs the 4SDM3/40 pump with its matched controller across Mombasa, Malindi, Diani, Kilifi, Lamu, and the wider coastal region.