DOYIN 4SD3/50 5.5HP 3-Phase AC Submersible Pump — 1.5" Outlet

The DOYIN 4SD3/50 is a heavy-duty 5.5HP three-phase AC submersible pump with an ordinary impeller, built for very deep boreholes. With a 1.5-inch outlet and a flow rate of 4.8m³/h (4,800 litres per hour), it delivers exceptional lifting capacity — rated for a recommended depth of up to 319 metres, with a maximum head of 358M, placing it among the deepest-rated pumps in the entire DOYIN catalog.

This pump is purpose-built for deep community boreholes, commercial water supply projects, and agricultural operations in areas with a very low water table, where standard depth pumps simply can't reach. 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 4SD3/50 requires a three-phase power supply and a matching three-phase AC controller sized to its 5.5HP 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 4SD3/50 pump, including the correctly rated 3-phase controller, across the coastal region and for larger agricultural or commercial clients further inland.

Specifications:

• Model: 4SD3/50
• Power: 5.5HP, three-phase AC
• Impeller: Ordinary
• Outlet size: 1.5 inches
• Max flow: 4.8m³/h (4,800L/h)
• Max head: 358M
• Recommended depth: 0–319M
• Power source: 3-phase AC (grid or generator)
• Required controller: Matching 3-phase AC controller, 5.5HP/4KW rating
• Application: Very deep boreholes, commercial water supply, agricultural systems with low water tables

FAQs:

Does this pump run on solar power?
No — the 4SD3/50 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 5.5HP/4KW — CoastalSolar Africa can supply and correctly match this.

Should I choose this over a stainless steel model like the 4SP5-58?
The 4SD3/50 uses an ordinary impeller and reaches deeper (319M vs 306M recommended) at a similar flow rate. If your borehole water has higher salinity or mineral content, the stainless steel 4SP5-58 may offer better long-term durability — CoastalSolar Africa can advise based on your water quality.

What's the maximum depth this pump can handle?
It's rated for a recommended depth of 0–319M, with a maximum head of 358M — one of the deepest pumps DOYIN offers.

Do you install 3-phase pumps in Kilifi and Malindi?
Yes, CoastalSolar Africa supplies and installs 3-phase submersible pumps like the 4SD3/50 across Mombasa, Malindi, Diani, Kilifi, Lamu, and inland agricultural areas with 3-phase power access.