How do use a power inverter at home？

What is a power inverter?

A device that changes direct current (DC) to alternating current (AC) is called an inverter. AC power can come from generators or the public power grid, while DC power generally comes from batteries.

Why use an inverter at home?

Emergency backup power: If you live in an area where the grid voltage is unstable and power outages are frequent, you need to consider building a backup power system for yourself. In an emergency, an inverter can convert DC power from a car battery or storage battery into AC power for emergency lighting, emergency communications, and other home appliances.

Solar power generation system: If you have solar panels on your roof, then an inverter is an indispensable key device. Solar panels generate DC power, and most of your appliances require AC power to drive. The inverter is the conversion device.

DIY off-grid power system: You can combine batteries, inverters, and any device to form an off-grid system according to your needs. For example, a backup power system for a sewage pump.

You can also use the inverter with a solar power system to power DC Fast Charging Stations.

Several types of home inverters

Off-grid inverter

Off-grid inverters are often used with battery banks to provide backup power in the event of a power outage.
One end of the inverter is connected to the battery, and the other end is directly connected to the load. They cannot be connected to the public grid because they do not have a synchronization function and are not affected by the public grid.

The pure sine wave inverter, modified sine wave inverter, and square wave inverter commonly found on the market can all be used as independent inverters.

Grid inverter

Grid-tied inverters (GTI) can be used with batteries and the public grid. It converts DC power from the battery (from the solar system) into AC power required by the load. It enables the solar panel system’s excess energy to be fed back into the grid, synchronizing the current’s frequency and phase to fit the utility grid. Power is transferred from a DC source to the utility grid by increasing the voltage level of the inverter.

Hybrid inverter

Hybrid inverters combine the functions of a stand-alone inverter and a grid-tied inverter. This type of inverter can effectively manage the current operation between the solar system, the battery, and the public grid. It can inject the excess capacity generated by the solar power generation system into the public grid to obtain compensation when the power is sufficient. It can also be used to generate electricity. When the system and battery are unable to carry the power supply, the public grid switches to power the home. In other words, a hybrid inverter can operate as a standalone inverter or as a grid-tied inverter, depending on the load requirements.

How do I choose a suitable home power inverter?

Regarding how to choose an inverter suitable for your home, you only need to consider the following points:

1. If your home does not have a solar power generation system, then you only need to choose an ordinary off-grid inverter—a pure sine wave inverter. A modified sine wave inverter. Choose the right product based on your budget, battery type and power requirements.
2. If your inverter needs to be used for a solar system, then you have to consider whether it is an off-grid system or a grid-connected system. For an off-grid solar system, you can use an ordinary off-grid inverter, a charge controller and a solar panel. For grid-connected solar energy, you need to use a grid-connected inverter or a more advanced hybrid inverter.

The installation steps we describe next are only for ordinary off-grid power inverters. Grid-connected inverters and hybrid inverters require more professional tutorials, which JCPOWER will share with you in future blogs.

Installation of power inverter

Preparation

Choose a dry, well-ventilated place to place the inverter; avoid direct sunlight, high temperatures, high humidity, and dust.

Prepare the tools (screwdriver, wrench) and installation materials (cables, fuses, terminal blocks, etc.) required for installation. Most brands, including Juniper, will give you wrenches, cables, and fuses.

Safety check

Make sure the inverter is turned off during installation, and do not connect the load to the inverter first.

Check whether the inverter casing is damaged.

Connect the battery

Positive and negative wiring: Connect the positive and negative poles of the inverter to the positive and negative poles of the battery, respectively. Generally, the positive pole uses a red cable, and the negative pole uses a black cable.

Check the inverter

After connecting the inverter, turn on the inverter switch to check whether the inverter indicator light is on and whether there is any fault.

Connect the load device

Connect the device to be powered to the output end of the inverter. You need to be aware that conventional inverters cannot drive high-power inductive loads, such as motors, high-power solenoid valves, etc.

Test

Finally, turn on the inverter switch and turn on the connected devices to see if the appliances are operating normally. Check if the equipment is working properly and if the inverter has abnormal beeps or overheating.

For more details, please check the instruction manual of the brand you purchased.

Inverter use and maintenance

1. Battery matching: Ensure that the voltage of your battery or battery pack is compatible with the inverter input voltage range
2. Prevent battery over-discharge and over-charge: Battery over-discharge may reduce battery life or even damage the battery. A battery overcharge may cause battery damage or fire. Using batteries with a battery management system or periodically checking the battery voltage can help avoid over-discharge and over-charge.
3. Avoid long-term overload. The inverter has its rated power. Exceeding this power range will cause the equipment to overload, thereby shortening its service life. Try to avoid long-term overload use of the inverter to ensure that it works within a reasonable range.
4. Monitor the operating status: Monitor the operating status of the inverter through the LCD indicator panel of the inverter. Observe whether the working indicator light of the inverter is normal and whether there is any abnormal noise or vibration.
5. Check the wire connection regularly. The input and output wires of the inverter may be loose due to vibration or other reasons.

Common problems and solutions

1. Short battery life: This may be because the inverter has high power, the load has high power consumption, or the battery itself has low capacity. . The solution to this problem is to reduce the load power or replace the battery with a larger capacity.
2. The inverter cannot start. It may be because the battery voltage is too low or too high, the battery is insufficient, or the line connection is poor.
3. The inverter is overheating. It may be because the inverter load is too large, the ambient temperature is too high, or the cooling fan is not working. It is recommended to reduce the load, check and maintain the cooling fan.
4. The inverter is noisy. The inverter load is too high, or the internal parts are aging.
5. The output voltage is unstable. It may be that the battery voltage is insufficient, or it may be a problem with the inverter itself. If the problem cannot be solved after replacing the battery, you may need to find a professional to check the inverter.
6. Unable to power the device: Check whether the device operating power is greater than the rated power of the inverter. The inverter did not start correctly. The output port, or socket, is damaged.

Conclusion

The inverter is a vital component in the home power system. Correctly selecting and regularly maintaining the inverter can ensure the stability of the power system, extend the service life of the equipment, and improve its working efficiency. Bring convenience to your daily life and work.

Frequently Asked Questions