DOYIN 4SP5-44 5.5HP 3-Phase Stainless Steel Submersible Pump — 1.5" Outlet

The DOYIN 4SP5-44 is a heavy-duty 5.5HP three-phase AC submersible pump built with a stainless steel impeller for durability and corrosion resistance in demanding borehole conditions. With a 1.5-inch outlet and a flow rate of 6.6m³/h (6,600 litres per hour), it offers strong lifting capacity — rated for a recommended depth of up to 232 metres, with a maximum head of 271M, making it well suited to deep boreholes where standard pumps can't reach the water table.

This pump fits deep community boreholes, commercial water supply projects, and agricultural operations in areas with a low water table. The stainless steel impeller offers added protection against mineral content and mild salinity in borehole water, making it a solid option for coastal properties in Mombasa, Malindi, Diani, Kilifi, and Lamu, as well as inland areas with deep boreholes and access to three-phase power.

As a three-phase AC pump, the 4SP5-44 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 4SP5-44 pump, including the correctly rated 3-phase controller, across the coastal region and for larger agricultural or commercial clients further inland.

Specifications:

• Model: 4SP5-44
• Power: 5.5HP, three-phase AC
• Impeller: Stainless steel
• Outlet size: 1.5 inches
• Max flow: 6.6m³/h (6,600L/h)
• Max head: 271M
• Recommended depth: 0–232M
• Power source: 3-phase AC (grid or generator)
• Required controller: Matching 3-phase AC controller, 5.5HP/4KW rating
• Application: Deep boreholes, commercial water supply, agricultural systems with low water tables

FAQs:

Does this pump run on solar power?
No — the 4SP5-44 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.

How does this compare to the 4SP5-58 (7.5HP)?
Both share the same 6,600L/h flow and 1.5" outlet, but the 4SP5-58 reaches greater depth (306M vs 232M recommended) at a higher 7.5HP rating — the 4SP5-44 is the more economical choice where 232M depth is sufficient.

Is the stainless steel impeller worth it for coastal boreholes?
Yes, it offers better resistance to mineral content and mild salinity often found in coastal borehole water compared to ordinary impeller pumps.

Do you install 3-phase pumps in Kilifi and Malindi?
Yes, CoastalSolar Africa supplies and installs 3-phase submersible pumps like the 4SP5-44 across Mombasa, Malindi, Diani, Kilifi, Lamu, and inland agricultural areas with 3-phase power access.