Off grid solar system with battery backup

In our daily life, home appliances have become indispensable tools in our lives, such as air conditioners, refrigerators, rice cookers, etc. Electricity needs to be needed all the time, but once the electricity consumption exceeds the load of the national grid, the national grid can only suspend power supply until everything returns to normal. At the same time, due to the rising international oil prices, people's electricity costs are getting higher and higher, and finding suitable alternatives has become an urgent thing for people. For example, using solar energy and storing them to prevent use when there is no mains supply is a good solution. You need a reliable and complete off grid solar backup system. Unlike the grid-connected solar system, the main function of the off grid solar with battery backup system is to store the solar energy in the battery and extract the electricity from the battery when you need it.

For the choice of solar panels, the more solar panels you have, the shorter the time to recharge the battery. After the battery is fully charged, you can directly use solar energy to power the load when there is sunlight.Generally, the total input power cannot exceed the output power of the inverter.So how to choose the right off grid solar system with battery backup?You need to learn more.

1) Is off grid solar backup system better with more solar panels?

However, in the off grid solar with battery backup system, the more solar panels, the better. Because the more solar panels, the greater the power and the higher the power generation, the faster the charging speed. However, the number of solar panels must be matched with the battery. For example, the battery you are equipped with is two pieces of colloidal 200Ah in series to form a 24V output off grid solar backup system. The solar controller must select mppt maximum power tracking type. At this time, the power of the solar panel must not exceed twice the capacity of the battery. If it is more than twice, the solar controller cannot control it. If the charging speed is too fast, high voltage will be formed. For more information on how to select the appropriate number of solar panels, please contact XINDUN Power!

2) How to match the solar inverter and battery in the off grid solar system with battery backup?

The capacity of the storage battery for the solar inverter is mainly determined by the expected value of the service time of the electrical appliance. Generally, the larger the better, so that the continuous power supply time is longer, and the trouble of frequent charging is avoided. However, if the battery is too large, the required charging current is also too large (generally for a 100Ah battery, the charger current is not more than 30A). The charging current is less than the rated charging current of the battery, which will lead to too long charging time and affect the timely recharge of the battery.

Example: battery capacity Ah × Voltage 12V=inverter power P × (10-15 hours), the battery capacity required for working with 100W appliance for 10 hours=(100W/12V) × 10h × 2 (battery capacity utilization factor) ≥ 200Ah (The rated current of the matched charger can be 20A~70A)
The connecting wire between battery and solar inverter shall be as short and thick as possible. Especially, the 12V/24V power supply current is large and the line loss is serious.

3) How to calculate how long a fully charged battery can last?

Label of battery capacity in the off grid solar with battery backup system:
For example: 30W electric fan, a 1kW solar inverter and a 12V100Ah battery. Power 30W divided by 12V equals 2.5, and 100A divided by 2.5 equals 40 hours.
So the fan can work for about 40 hours.

For off grid solar system with battery backup, you can choose between cheaper lead-acid batteries, or lithium-ion batteries, which can be used more frequently but are also more expensive. No matter what type of battery you choose to use, please remember to place the battery pack in a dry, cool place, otherwise the battery may explode or short-circuit due to overheating or contact with water.

Our XINDUN power provides different and efficient off grid solar backup system solutions for more than 63 countries, and has been unanimously recognized by customers. Through professional, efficient and high-quality products and services, we provide users with high-quality off grid solar system with battery backup solutions. Welcome to contact us.

However, in countries with imperfect power facilities, it is obvious that the grid-connected system cannot solve the problem. The places where people live often do not have electricity provided by the national grid, or the national grid only provides electricity for a short period of time. At this time, people need to store solar energy for future use. The off grid solar backup system is designed for this demand. It is equipped with batteries, solar panels and corresponding equipment for storage needs. In the case of sufficient sunlight during the day, the off grid solar with battery backup system will automatically charge the battery. When the mains electricity is available, the off grid solar system with battery backup will use the electricity stored in the battery to supply power to the load of the home, while also leaving the cost of the mains electricity.

The off grid solar backup system of XINDUN Power are widely used all over the world. In the past 16 years, it has been providing customers with high-quality and efficient off grid solar with battery backup solutions, and has won unanimous praise from customers. Hope we will do better in the future.