Solar energy equipment core indicators

Core performance indicators

1. Head (H)

Definition: The maximum height to which a water pump can lift water vertically (unit: meter).

Customer focus:

Deep well pumping: Choose a high-head submersible pump (e.g. 50-200 meters).

Surface irrigation: Low-head centrifugal pump (e.g. 10-50 meters).

Example:

Orchard irrigation (head 30 meters) → Choose a H≥35m pump, leaving a margin to deal with pipeline friction loss.

2. Flow (Q)

Definition: Pumping volume per unit time (unit: cubic meter/hour, m³/h).

Customer focus:

Agricultural irrigation: Calculated according to crop water demand (e.g. 1 mu of vegetables requires 2-5m³ of water per day).

Household water use: Calculated according to population (e.g. a family of 5 requires 1-2m³ of water per day).

Formula reference:

Flow Q = Daily water demand ÷ Effective sunshine time (e.g. 20m³ per day, 5 hours of sunshine → Q=4m³/h).

3. Photovoltaic panel power (P)

Definition: The power generated by the solar panel (unit: kilowatt, kW).

Customer focus:

Power matching: A 1kW water pump needs to be equipped with a 1.5-2kW photovoltaic panel (considering the loss on cloudy days).

Occupancy area: A 1kW monocrystalline silicon panel requires about 6-8㎡ (the higher the efficiency, the smaller the area).

Example:

Irrigation of 10 acres of land (daily water demand 30m³, head 40 meters) → photovoltaic power ≈ 3kW.

4. System efficiency

Definition: The overall conversion rate of light energy → electrical energy → water energy (usually 30%-50%).

Customer value:

High-efficiency systems (such as MPPT controllers) can reduce the use of photovoltaic panels and reduce initial investment.

Reliability indicators

1. Photovoltaic panel life

Standard: 25 years (efficiency attenuation <20%).

Customer guarantee:

Warranty period: Mainstream brands provide 10-12 years product warranty and 25 years power guarantee.

2. Pump life

Standard:

Stainless steel submersible pump: 8-15 years (no sand wear).

Cast iron centrifugal pump: 5-10 years (regular maintenance required).

3. Environmental adaptability

Extreme temperature:

Photovoltaic panel: -40℃ to +85℃ (applicable to high altitude/desert areas).

Water pump: high temperature resistant motor (insulation grade H, no damage at 180℃).

Intelligence and scalability

1. Intelligent control function

Remote monitoring: mobile phone APP to view pumping volume and system status (such as Lorentz brand).

Automatic protection: dry pumping protection, overload shutdown, lightning protection module.

2. Energy storage expansion

Battery selection:

Lead-acid battery: low cost, suitable for short-term backup (such as 1 day on a cloudy day).

Lithium battery: long life (2000 cycles), suitable for long-term off-grid use.

Example of customized solutions

Case 1: Household water (family of 5)

Demand: 2m³ of water per day, 30m deep well, 4 hours of sunshine.

Configuration:

Water pump: 0.5kW DC submersible pump (Q=0.5m³/h, H=35m).

Photovoltaic panel: 1kW monocrystalline panel (2×500W).

Cost: about 12,000 yuan (about 8,000 yuan after subsidy).

Case 2: Medium-sized farm (50 mu of vegetables)

Demand: 80m³ of water per day, 20m head, 5 hours of sunshine.

Configuration:

Water pump: 4kW centrifugal pump (Q=16m³/h, H=25m).

Photovoltaic panel: 8kW array (16×500W).

Cost: about 90,000 yuan (about 60,000 yuan after subsidy).

Customer FAQ

Q1: Can it work normally on rainy days?

Solution:

No energy storage: Pump water to the water storage tank for backup on sunny days (recommended low-cost solution).

With energy storage: Equipped with a 10kWh battery, it can support 1-2 days of rainy days.

Q2: Is maintenance complicated?

Answer:

You only need to clean the photovoltaic panels monthly and check the sealing of the water pump every year (ordinary farmers can operate it).

Summary

The core indicators of solar water pumps (lift, flow, photovoltaic power) need to be customized according to the actual water demand of customers. Its zero fuel cost, long life and low maintenance characteristics are especially suitable for agricultural irrigation, water supply in remote areas and environmental protection projects. Combined with government subsidies, the investment payback period can be shortened to 2-5 years, which is a sustainable solution to replace traditional water pumps.