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What is an off-grid solar system?

An off-grid solar system is a standalone power system that uses solar panels, batteries, and inverters to generate and store electricity independently, without relying on the main power grid.

An off-grid solar system pulls energy from the sun and its rays through solar panels, which most often are mounted to the roof of a home, cabin or RV. The energy the panels collect is then routed to a battery that stores the energy until you need it, when an inverter converts it into electricity.

We are a trusted photovoltaic (PV) solutions expert, offering comprehensive services for power plants and solar projects. Designed, installed, and completed the construction of over a thousand small, medium, and large-scale photovoltaic power plants. we specialize in delivering high-quality PV products and energy storage devices at competitive prices, catering to global markets.

How to design an off-grid solar system?

Step 1 - Estimate the loads
The most important part of designing any off-grid solar or battery system is calculating how much energy is required per day in kWh. For grid-connected sites, detailed load profile data can be obtained using meters to measure the loads directly. For off-grid or stand-alone power systems, always start by using an off-grid load calculator (load table) for summer and winter requirements. The load table will also help calculate surge loads, power factors, and the maximum demand required to size an appropriate off-grid inverter.

Step 2 - Battery sizing
Battery capacity is measured in either Ah or Wh. Lead-acid (deep-cycle) batteries are sized in Ah, while lithium battery capacity is measured in kWh. All loss factors need to be considered to ensure the battery size is adequate to meet the loads, including maximum allowable depth of discharge (DoD) and round-trip efficiency. Also, consider battery type and chemistry, battery voltage range, minimum days of autonomy (continuous days without sunshine), and maximum battery charge rate (C rating).

Step 3 - Solar array sizing
A correctly sized solar array is required to charge the battery while also supplying the loads. To ensure the solar array is large enough, consider local conditions, including average solar irradiance throughout the year (peak sun hours), shading issues, panel orientation and tilt angle, cable losses, and temperature derating (loss factors).

Step 4 - Inverter selection
After steps 1 to 3 have been established, you can then select a suitable solar inverter or MPPT Solar Charge Controller to match the solar array depending on the panel and string length, which will determine the string voltage. Use a string voltage calculator to calculate the maximum and minimum string voltages.

Our Strengths
One-Stop Service: From design to installation and after-sales maintenance, we provide end-to-end solutions tailored to customer needs.Extensive Experience: Having successfully completed thousands of projects, from residential to large commercial installations, we excel in design, installation, and maintenance, meeting diverse client requirements.

Fengrui Solar SystemsShandong Fengrui Power Technology Co., Ltd handles all production and packing processes in-house to deliver solar systems with tight tolerances and accurate specifications. We work with customers from various industries and have the expertise and equipment to handle small or large production runs.