Generally speaking, the solar power system refers to a solar photovoltaic power generation, referred to as “photoelectric.”
It refers to the use of semiconductor interface photovoltaic effect and solar radiation into electricity.
Core components of solar power system is the solar cell module.

PV systems can be used in any of the power supply,
It provides clean energy for the various applications in the world.
From the peak of the economic development to remote areas, islands and other areas without electricity shortage, PV systems can provide green electricity to all aspects of human life.

(1) remote areas, islands and other areas without electricity use;
(2) road, rail, shipping and transportation;
(3) communications, communications;
(4) petroleum, marine, meteorology, aerospace;
(5) solar photovoltaic lighting, photovoltaic power plants;
(6) building integrated photovoltaic systems;
(7) Solar merchandise and toys.


On-grid photovoltaic power generation system is connected to the grid and transmission of electricity to the grid.
The main power plant include a rooftop systems and large ground station system.
The main difference between the on-grid and off-grid systems is whether the power connection to the grid.

PV grid system generally consists of solar module matrix, grid-connected inverter and some electrical equipment (combiner box,
Power distribution cabinets, etc.).

PV system

PV off-grid system is also called stand-alone PV systems,
Refers to a power generation photovoltaic power generation system is not connected with the public grid.
Its typical feature is the use of solar power during the day, in batteries and other energy storage and electric energy storage,
It can provide power to the relevant electrical equipment when needed.
PV off-grid system generally consists of solar cell matrix, from the network controller, battery, off-grid inverter and other components.

PV system design

  1. For the corresponding photovoltaic system, how to calculate the installation area?

A: Generally for large ground-based power plants and cement roof, a square meter can be installed 50-70W components

For color steel roof, a square meter can be installed 80-100W components.

  1. How to calculate the power output of PV systems?

A: To calculate the amount of photovoltaic power generation system, need to know the effective duration of sunshine at the installation site, system efficiency, system installation capacity.

For example 1000W PV off-grid systems, installation location for Beijing, the effective sunshine time is 4 hours, and off-grid PV system efficiency is about 60% -70%

So the system generating capacity per day = Component * number of hours of sunshine * effective system efficiency

= 1000 * 4 * 0.6 = 2400Wh, 2.4 kWh.

For system design according to customer requirements, what informations need to provide by customers?


(1) where the solar power generation system will be used? How about the solar radiation?

(2) how much is the load power of the system?

(3) how much is the output voltage of the system, DC or AC?

(4) how many hours of work per day?

(5) how many days the system needs to be continuously supplied for a rainy day?

(6) load, pure resistive, capacitive or inductive, large starting current?