Working Principle of Solar Submersible Deep‑Well Pump System
This is a battery‑free solar water‑lifting system, suitable for remote areas without grid power. Solar energy is converted into stored water in an elevated tank, realizing all‑day water supply by gravity.
System Components
- Solar photovoltaic panels: convert sunlight into direct‑current (DC) electricity
- Solar pump inverter (power conditioning unit): system controller with MPPT function
- Submersible deep‑well pump: installed underwater inside the borehole
- Water delivery pipelines: lift groundwater to ground surface
- Elevated water storage tank: store water for gravity‑fed water supply
Full Working Process
- Solar power generation
Sunlight hits solar panels. Photovoltaic effect converts solar radiation into DC electricity. Output power changes with sunlight intensity. - Power conditioning by inverter
Unstable DC power goes into the solar pump inverter. It runs MPPT maximum‑power‑point tracking, converts DC into three‑phase AC power for the pump motor. It automatically adjusts pump speed according to sunlight level, and provides over‑voltage, over‑current and dry‑run protection. - Underwater submersible pump lifts groundwater
AC power is transmitted down‑hole to the submersible deep‑well pump which is fully submerged in underground water. The motor drives impellers to pump groundwater upward through delivery pipes to ground level. - Water stored in elevated tank
Pumped water flows into the elevated water storage tank for water reserve. - Gravity‑driven water supply
Water in the high‑level tank is supplied to users by gravity. Water is still available after sunset, even without solar power input.
Key Features
- No utility grid or battery bank required, lower investment and fewer failure points.
- Pumping capacity follows sunlight: high output on sunny days, reduced output in weak light.
- Water storage tank stores solar energy in the form of water to achieve 24‑hour water supply.
- Ideal for rural drinking water supply and farmland irrigation in off‑grid mountainous regions.
Solar panel collocation recommendation
Application Scenarios, Advantages & Precautions of Solar Submersible Pump System
Application Scenarios
- Rural drinking water supply: For remote mountain villages without grid power. Draw groundwater and store water in elevated tanks for gravity‑fed domestic water supply.
- Farmland irrigation: Irrigation for orchards, farmland and greenhouses. Water can be stored in reservoirs for off‑peak irrigation.
- Livestock water supply: Water supply for ranches and livestock farms in off‑grid remote areas.
- Afforestation & ecological restoration: Water supply for mountain afforestation and vegetation recovery in power‑free wilderness.
- Emergency disaster‑relief water supply: Quick deployment for drinking water supply when power grid is damaged by disasters.
- Aquaculture water supply: Water replenishment and water exchange for fish ponds in off‑grid locations.
Not suitable for scenarios requiring 24‑hour continuous pumping without water storage.
Advantages
- No utility grid required: Suitable for off‑grid sites, saving expensive power cable installation cost.
- Extremely low operating cost: Free solar energy, almost zero electricity cost, low long‑term maintenance cost.
- Green and eco‑friendly: Clean renewable energy, no fuel consumption, zero exhaust and low noise.
- Simple structure & low maintenance: Battery‑free design reduces battery failure and replacement cost. Only routine inspection is needed.
- Automatic operation with MPPT function: Inverter tracks maximum solar power, automatically adjusts pump speed according to sunlight. It shuts down when light is insufficient to protect motor.
- 24‑hour water supply by gravity: Water is pumped into elevated storage tank in daytime; gravity supplies water after sunset.
- Modular expandable design: Solar array can be expanded to match different voltage levels from 60V to 280V for varied head and flow requirements.
Important Precautions
- Solar panels: Install panels facing south (Northern Hemisphere). Avoid shading. Clean dust regularly. Strictly match solar array voltage to inverter rated voltage (60V‑280V). Keep correct polarity for wiring.
- Solar pump inverter: Install in ventilated rain‑proof enclosure. Complete earthing and lightning protection. Do not run without pump load. Dry‑run protection stops pump at low water level.
- Submersible deep‑well pump: Pump must be fully submerged underwater. Select pump based on well depth, head and flow. Use waterproof submersible cables. Check pipelines for leakage.
- Water storage tank / reservoir: Sufficient tank height for gravity pressure. Keep reservoir clean against algae and pollution.
- Environment & operation notes: This is battery‑free system: no pumping at night. Reserve enough water storage for cloudy days. Anti‑freeze for pipelines in cold regions. Perform regular system inspection.