How to choose solar off grid inverter based on power

Many customer advisory technical personnel about solar inverter power, will usually ask how much power is enough to use?. But here we need to make different judgments about different needs.

First of all, you need to know that your system is grid connected or off grid. If it is grid connected, then the power of solar inverter system only needs to be slightly larger than the connected solar power component; if it is off grid, then the power of solar inverter system need to decide according to the load.

Secondly, after the judgment of your system, we need to figer out your total load power and composition (here for off grid system, grid connected system only need to know the total solar power). For the general load, can meet the use when just larger than the load power; if the load is inductive, such as refrigerators, televisions, air conditioning, you need to consider the starting power. Due to the inductive load is usually 3-4 times current at startup, then inverter power must to meet the maximum power, otherwise it can’t start load, therefore the inverter power need to be 3-4 times of the total load power.

Finally, consider the efficiency. General formal manufacturers logo will show the efficiency, the solar off grid inverter efficiency is about 60-90%, the higher the efficiency is, the higher the energy utilization ratio is, of course, the more expensive price. There is a particular point needs to pay attention to, generally the power which inverter manufacturers said is the visual power, such as they say 1KW is actually 1KVA which equivalent to 800W, the user must be aware of this when buying.