/ External Controller
Off-Grid Solar Water Pumps
Controller 3HP-30HP
Off-Grid Solar Water Pump Controllers (3 HP to 30 HP) are designed for a reliable water supply in remote and agricultural areas. These MPPT-based solar controllers ensure maximum efficiency, durability, and performance for submersible and surface pumps, reducing energy costs and enabling sustainable off-grid irrigation.
Harness the power of
the sun to deliver water anytime,
anywhere…
Smart Solar Powered Irrigation
Pump Controller
Smart solar-powered Irrigation pump controller ensures efficient water
management using clean solar energy. Designed with advanced MPPT technology, it optimises power usage, reduces electricity costs, and delivers reliable performance for farms,
borewells, and off-grid irrigation systems.
/ Technical Snapshot
0.3-30hp Economic
Well Pump
External Controller
Maximum Power
30 Hp
Maximum Lift
400 m
Maximum Flow
115 m³/h
Operating Voltage
60-450 VDC / 200-800 VDC, 150-240 VAC
Motor Type
Water-filled BLDC / PMSM
Certification
ISO / CE / RoHS Certified
/ Product Overview
What a SAMKING
Solar Submersible Pump is
SAMKING solar submersible pumps convert sunlight into power
via a solar panel array, which drives a water-filled BLDC motor submerged in
a borehole or well. The motor powers an impeller or screw to push water upward, providing a clean and sustainable solution where
electricity is unreliable or unavailable.
These pumps are ideal for:
+ Domestic water supply in homes and communities.
+ Agricultural irrigation for crops, greenhouses, and farms.
+ Livestock drinking water systems in rural areas.
+ Deep wells and boreholes for continuous water extraction.
Each SAMKING pump is designed with efficiency, reliability,
and low maintenance at its core.
/ Trust, Performance, Simplicity /
Why Choose External
Solar Submersible Pump Controller
01
True Off-Grid
Operation
no dependency on the grid, for remote water flow.
02
Wide Range
3Hp - 30Hp
scalable to small farms up
to large irrigation systems.
03
MPPT &
Smart Control
maximum solar harvest &
reliable pump performance.
04
Low
Operation Cost
once installed, harnesses free solar energy
05
Durable &
Weather-Proof
For harsh environments,
minimal maintenance
06
Reduced
Carbon Footprint
the greener solution for
our future.
External Controller Solar
Pumps 3HP to 30 HP
An external controller is a separate component housed in a control box located above ground, away from the submerged pump motor. It manages the pump's operations and electrical functions from a safe, dry location.
Characteristics of external controller
solar pumps 3Hp-30Hp
+ Common with 3-wire pumps
External controllers are typically used with
3-wire submersible pumps, which do not have a built-in starting capacitor. The control box contains the starting and running capacitors, relays, and other protective components necessary to start the motor.
+ Protection Features
External controllers often include thermal overload
protection, which automatically shuts off the pump if it overheats. They can also protect the pump from overcurrent and low-water conditions (dry-running).
+ Easy to service
Since the controller is located on the surface, troubleshooting and repairs are much simpler and cheaper. A technician can test or replace components in the control box without needing to pull the entire pump from the well.
+ Upgradability
External controllers are often easier to upgrade or replace if you want to add new features or advanced controls, such as a variable speed drive (VSD) to enhance efficiency and maintain constant water pressure.
+ Durability & Cost
The control box protects sensitive electronics from the
harsh down-well environment. However, the initial cost is typically higher than a pump with an internal controller.
/ Pump Advantages
Advantages of Solar Submersible
Pumps External Controller
Feature
/ High-efficiency BLDC motor:
/ Encapsulated water-filled motor:
/ Wide voltage & head range:
/ Smart controller with protections:
/ Stainless steel body & corrosion-resistant parts:
/ Fully automatic, no operator needed:
Benefit to You
+ 15–20% better energy use, lower solar panel cost
+ No oil leaks, longer life, safer operation
+ Works with diverse well depths and solar setups
+ Dry-run, over-current, over-voltage, and temperature safeguards
+ Durable in harsh environments
+ Set and forget — minimal maintenance
/ Motor of SAMKING
Permanent Magnet
BLDC Motor
● High-efficiency synchronous design improves performance by up to 20%.
● Reduces energy consumption and minimises the number of solar panels needed.
● Long service life with stable power output and soft-start control.
Advanced Motor & Winding System
● Magnet material of 40SH aluminum iron boron for superior temperature resistance up to 150°C.
● Cold-rolled silicon steel sheets for stator and rotor, ensuring minimal loss and vibration.
● 180°C copper enameled wire with insulation grade F.
/ Premium Quality
Superior Material
Construction
● 304 Stainless Steel Shaft prevents breakage and corrosion.
● 304 Stainless Steel or Copper Components for outlet, connection, and cylinder.
● Silicon Carbide + Graphite Mechanical Seal ensures high reliability and extended service life.
● Japanese NSK Bearings for reduced friction and improved axial load capacity.
● Double Bearing Rotor Support provides greater stability under deep-lift conditions.
/ Controller Advantages
Advantages of Solar Submersible
Pumps External Controller
Waterproof Grade:
Ambient Temperature:
Voltage:
MPPT Function:
Display:
Control Modes:
Protection:
Soft Start:
Auto Operation:
IP65
-15°C to +60°C
40-90Vmp/100Voc
Optimizes solar utilization with up to 98% efficiency
LED showing voltage, current, power, and speed
Auto speed adjustment or manual override
Overvoltage, undervoltage, overcurrent, short circuit, dry-run, high temperature
Prevents inrush current and protects motor
Starts and stops based on sunlight and demand
Autonomous Solar Control
SAMKING controllers intelligently adjust to solar input and protect the system, ensuring smooth, autonomous performance without manual supervision.
/ Relevant Models
Hot-Selling Solar Submersible
Pump Series
DC Brushless Solar Submersible Pump
● Operates directly from solar power.
● Ideal for areas without grid connectivity.
● High-efficiency BLDC motor for consistent performance.
● Applications: Domestic water, irrigation, livestock supply.
● Max Lift: [158m] | Max Flow: [21.1m³/h] | Power: [1.3HP/1500W]
● Relevant Models: 3SPW1-11P, 4SPW2-7P
High Voltage DC Solar Submersible Pump
Single-Phase AC/DC Hybrid Submersible Pump
● Automatically switches between solar and grid when sunlight is low.
● Supports both AC 90–240V and DC input.
● Ensures continuous water supply in all weather conditions.
● Applications: Farms, households, institutions.
● Max Lift: [185m] | Max Flow: [51.6m³/h] | Power: [3HP/2200W]
● Relevant Models: 4SP5-6, 4SP5-10
Three-Phase AC/DC Hybrid Submersible Pump
● Designed for high-demand users and deep boreholes.
● Automatic switching between solar and grid, prioritizing solar.
● High lift, large flow, and heavy-duty construction.
● Applications: Agricultural irrigation, community water systems, industrial.
● Max Lift: [400m] | Max Flow: [115m³/h] | Power: [30HP/22000W]
● Relevant Models: A/D-4SPW3-20P
/ Quick Guide
How Solar Water Pump
External Controller Works
● Solar panels generate DC electricity from the sun.
● The solar controller receives that power and using its MPPT algorithm, optimises the voltage/current to drive the pump motor efficiently.
● The pump (3HP-30HP) delivers water from source (well, borehole, surface-water) to destination (irrigation field, storage tank, livestock trough).
● The system keeps running as long as solar input allows; storage or tank backupen sures water supply even when sunlight is lower.
● Minimal maintenance; designed for long-term off-grid reliability.
/ Key Benefies
Benefits of SAMKING Solar Pump Kits
Zero Infrastructure
Install anywhere — even off-grid. No wiring, transformers, or grid dependency.
Low Operating Costs
Powered entirely by solar energy — zero fuel and near-zero maintenance.
Multi-Source Water
Draws water from wells, ponds, lakes, or tanks. even at low depths (≥1 m).
24-Hour Supply
Pairing with storage tanks ensures round-the-clock water availability.
Effortless & Secure
Smart controller handles auto start/stop, speed regulation / protection.
/ Check List
Installation & Commissioning
● Provide safety cable (stainless steel) & recommended poly pipe.
● Confirm borehole/well diameter and safe drop length.
● Mount the external controller in a shaded weatherproof box (IP65 recommended).
● Connect solar panels per controller voltage/current recommendations.
● Do a dry run and verify the controller display values (voltage/amp/watts).
● Connect solar panels per controller voltage/current recommendations.
/ Application /
Domestic Water Supply
Perfect for homes, villages, schools, and institutions that need a consistent and clean water source.
Agricultural Irrigation
Ideal for drip, sprinkler, or flood irrigation systems. Maintain crop health while cutting fuel costs.
Watering Livestocks
Reliable source for cattle, poultry, and dairy farms — even in remote grazing areas.
Community & Borehole
Used by NGOs, governments, and private enterprises to power rural water access programs.
/ Reviews & Feedback
Hear from Our Customers
Domestic Water
(Kenya)
Our family now enjoys a steady supply of water powered entirely by solar energy. The pump has been running for over a year…
Field Irrigation
(Zambia)
The pump delivers powerful flow even
on cloudy days. Maintenance-free and reliable just perfect for our small farm…
Herd Watering
(India)
No more diesel costs. The system runs automatically every morning. We can now focus on farming instead of managing…
/ Q&As
Solar Water Submersible
Pumps Questions &
Answers
Do I need a float or well switch?
Can SAMKING pumps run on both solar and grid power?
What type of motor is used?
How long do these pumps last?
Can I install it myself?
/ Downloads & Resources
/ Services
We Offer Reliable Support
Pre-Sales Support
· 24/7 availability, 1-hour responding.
· Comprehensive solutions for your needs.
· Support for Distribution, OEM, and ODM.
Contract Fulfilment
· Standardised service & inspection.
· Rigorous product checks.
· Order and logistics tracking.
Post-Sales Service
· 2 year warranty with 24-hour support.
· Installation, and maintenance assistance.
· Online training available.
/ Keywords
SAMKING, solar water pump, Manufacturer, Water-filled BLDC motor, Agricultural irrigation, Livestock drinking water, Domestic water, solar submersible pump, deep well solar pump, AC/DC hybrid solar pump, sustainable irrigation system.
