DOYIN 3SDS4-400W (0.5HP) DC Solar Submersible Water Pump — 1" Outlet

The DOYIN 3SDS4-400W is a compact 0.5HP DC solar submersible pump, DOYIN's entry-level model, built for boreholes and wells up to 42 metres recommended depth (55M max head), delivering up to 4,000 litres per hour through a 1-inch outlet. It's a practical starting point for households, small farms, and poultry units needing a straightforward, low-cost off-grid water solution.

This model runs on a DC voltage range of 65–100V, requiring just 2 solar panels wired in series (2 x 300W, roughly 600W array) to reach the correct operating voltage — the smallest and most affordable panel setup in the DOYIN DC pump range. It's well suited to smaller coastal properties in Mombasa, Malindi, Diani, Kilifi, and Lamu where budget and simplicity matter as much as reliability.

As a direct DC solar pump, it needs no batteries for daytime operation — water flows as soon as the sun is up, keeping the system low-maintenance for coastal boreholes, beach properties, and rural homesteads facing unreliable grid power.

CoastalSolar Africa supplies, sizes, and installs the 3SDS4-400W pump with the correct panel configuration for your borehole depth and site conditions across the coastal region.

Specifications:

• Model: 3SDS4-400W
• Power: 400W (0.5HP)
• Outlet size: 1 inch
• Max flow: 4.0m³/h (4,000L/h)
• Max head: 55M
• Recommended depth: 0–42M
• Voltage: DC 65–100V
• Ideal power / panel requirement: 2 x 300W solar panels (600W array, wired in series)
• Power source: DC direct-drive solar (no batteries required)
• Application: Boreholes, shallow wells, domestic and small farm water supply

FAQs:

How many solar panels does the 3SDS4-400W need?
This pump is rated for 2 x 300W panels (roughly 600W total), wired in series to reach its 65–100V DC operating range — the smallest panel setup in the DOYIN DC pump range.

How does this compare to the 3SDS4-600W?
The 3SDS4-600W is the next step up — 0.75HP with a deeper 58M recommended depth and higher flow (also 4,000L/h max), using slightly larger 2 x 410W panels.

What depth can this pump handle?
It's rated for a recommended depth of 0–42M, with a maximum head of 55M — suited to shallower boreholes and wells.

Do I need batteries for this pump?
No — it runs directly off solar panels during daylight hours. Batteries are optional if you need water access after sunset.

Do you install this pump in Kilifi and Malindi?
Yes, CoastalSolar Africa supplies and installs across Mombasa, Malindi, Diani, Kilifi, Lamu, and the wider coastal region, including correct panel sizing on-site.

Tags:
solar water pump, 3SDS4-400W pump, 400W solar pump, 0.5HP submersible pump, 2 panel solar pump, DC solar pump Kenya, borehole pump Mombasa, solar pump Malindi, solar pump Kilifi, water pump Diani, solar pump Lamu, coastal solar irrigation

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Product: DOYIN 4SP5-25 3-Phase Stainless Steel Submersible Pump, 3HP, 1.5"

SEO Title:
DOYIN 4SP5-25 3HP 3-Phase Stainless Pump 1.5" | 6,600L/h, 132M Depth | Mombasa, Malindi, Kilifi | CoastalSolar Africa

Meta Description:
Buy the DOYIN 4SP5-25 3HP 3-phase stainless steel submersible pump with 1.5" outlet. Delivers 6,600L/h from up to 132M depth. Available in Mombasa, Malindi, Diani, Kilifi & Lamu. CoastalSolar Africa.

Slug:
doyin-4sp5-25-3hp-3phase-stainless-pump-1-5inch-kenya

H1:
DOYIN 4SP5-25 3HP 3-Phase Stainless Steel Submersible Pump — 1.5" Outlet

Long Description:

The DOYIN 4SP5-25 is a robust 3HP 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 solid lifting capacity — rated for a recommended depth of up to 132 metres, with a maximum head of 154M, suiting mid-depth boreholes beyond what standard domestic models can reach.

This pump fits mid-depth community boreholes, commercial water supply projects, and agricultural operations where flow needs are moderate but depth is a factor. 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 mid-depth boreholes and access to three-phase power.

As a three-phase AC pump, the 4SP5-25 requires a three-phase power supply and a matching three-phase AC controller sized to its 3HP 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 4SP5-25 pump, including the correctly rated 3-phase controller, across the coastal region and for larger agricultural or commercial clients further inland.

Specifications:

• Model: 4SP5-25
• Power: 3HP, three-phase AC
• Impeller: Stainless steel
• Outlet size: 1.5 inches
• Max flow: 6.6m³/h (6,600L/h)
• Max head: 154M
• Recommended depth: 0–132M
• Power source: 3-phase AC (grid or generator)
• Required controller: Matching 3-phase AC controller, 3HP/2.2KW rating
• Application: Mid-depth boreholes, commercial water supply, agricultural systems

FAQs:

Does this pump run on solar power?
No — the 4SP5-25 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 3HP/2.2KW — CoastalSolar Africa can supply and correctly match this.

How does this compare to the 4SP5-33 (4HP)?
Both share the same 6,600L/h flow and 1.5" outlet, but the 4SP5-33 reaches greater depth (174M vs 132M recommended) at a higher 4HP rating — the 4SP5-25 is the more economical choice where 132M 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 4SP5-25 across Mombasa, Malindi, Diani, Kilifi, Lamu, and inland agricultural areas with 3-phase power access.