How to choose or recommend an inverter？

Step 1：Choose ideal inverter for home use

1) If there is no power grid or there is a power grid at home, but you do not plan to sell to the power grid or the policy does not allow it, just use an off grid hybrid inverter. The inverter has a grid input interface. This interface is only used to draw power and does not Feed power to the grid. If you does not have a power grid, this power outlet does not need to be considered, and the system becomes a pure off-grid solar system.

2) If you wants to sell excess electricity to the power grid company or plans to sell the excess electricity to the power grid company in the future, he or she needs to choose an on/off grid hybrid inverter.

Step 2：Select the capacity of the inverter:

Electrical loads are divided into three categories, but there are generally only two categories in households:
Inductive loads generally have a motor in electrical appliances, such as washing machines, air conditioners, refrigerators, fans, water pumps, etc.
Capacitive load: basically none.
Resistive loads: water heaters, ovens, lighting fixtures, televisions, computers, etc. Inverter air conditioners and inverter refrigerators can also be considered resistive loads.
For resistive loads, the running power is basically stable, which is their rated power. Inductive loads are a bit special. There is a starting inrush current, that is, when starting, the
The current will be 5 to 8 times the normal operating current, which means that the starting power is 5 to 8 times the rated power.
Our company’s energy storage inverters all have certain impact resistance, for the convenience of selection. Here is a simple method:
Inverter rated power > (resistive load rated power + inductive load rated power X3)
For example, a family has a 350W washing machine, a 180W refrigerator, a 60W fan, and 5 light bulbs, each with a power of 30W. So when choosing an inverter,
The rated power of the inverter is > (350Wx3+180Wx3+60Wx3+5X30W), that is, the rated power of the inverter is >1920W, then choose a 2kw inverter.
Some customers may not be able to tell you the rated power of their appliances, but you can find the power estimates of similar appliances on Baidu. Looking back when you choose the inverter power
Then choose the bigger one. By the way, the rated power of some air conditioners and water pumps is HP (horsepower), please remember 1HP=735W.

PS: List of common household electrical appliances power:

At this point, the inverter has basically been selected and completed. Why do you say it is basically? Because some customers install it outdoors and need to consider the outdoor type. Some customers install it indoors.
If it is indoors, then just choose the indoor type.
Some national power grids are 220V 50Hz (single-phase) and 380V 50Hz (three-phase), the same as in China;
In some countries, it is 220V 60Hz (single-phase), 380V 60Hz (three-phase);
In some countries, it is 240V 60Hz (split-phase) and 440V 60Hz (three-phase).
Generally speaking, European and American countries mostly choose off-grid energy storage machines of 5kw and 8kw, which are outdoor types; Asian, African and Latin American countries mostly choose off-grid energy storage machines of 1kw, 2kw and 3kw.
Off-grid energy storage machines are divided into power frequency and high frequency. If you find that the customer has a lot of inductive loads/appliances, you can recommend power frequency. This kind of machine is resistant to strong surge current capability and high reliability (but bulky)