DOYIN 4SD3/40 4HP 3-Phase AC Submersible Pump — 1.5" Outlet

The DOYIN 4SD3/40 is a heavy-duty 4HP three-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.

This pump fits deep community boreholes, commercial water supply projects, and agricultural operations in areas with a low water table. It suits properties across coastal Kenya — Mombasa, Malindi, Diani, Kilifi, and Lamu — as well as inland regions with deep boreholes and access to three-phase power.

As a three-phase AC pump, the 4SD3/40 requires a three-phase power supply and a matching three-phase AC controller 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 grid or generator-backed three-phase electricity.

CoastalSolar Africa supplies, sizes, and installs the 4SD3/40 pump, including the correctly rated 3-phase controller, across the coastal region and for larger agricultural or commercial clients further inland.

Specifications:

• Model: 4SD3/40
• Power: 4HP, three-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: 3-phase AC (grid or generator)
• Required controller: Matching 3-phase AC controller, 4HP/3KW rating
• Application: Deep boreholes, commercial water supply, agricultural systems with low water tables

FAQs:

Does this pump run on solar power?
No — the 4SD3/40 is a three-phase AC pump requiring a stable 3-phase electricity supply. For solar-powered options, ask about DOYIN's DC or hybrid AD pump range.

What controller does this pump need?
It requires a matching 3-phase AC controller rated for 4HP/3KW — CoastalSolar Africa can supply and correctly match this.

How does this compare to the 4SD3/50 (5.5HP)?
Both share the same 4,800L/h flow and 1.5" outlet, but the 4SD3/50 reaches greater depth (319M vs 255M recommended) at a higher 5.5HP rating — the 4SD3/40 is the more economical choice where 255M depth is sufficient.

Should I choose this over a stainless steel model?
The 4SD3/40 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 3-phase pumps in Kilifi and Malindi?
Yes, CoastalSolar Africa supplies and installs 3-phase submersible pumps like the 4SD3/40 across Mombasa, Malindi, Diani, Kilifi, Lamu, and inland agricultural areas with 3-phase power access.