Let's start with the off-grid inverter.
First of all, what is the inverter, the battery electricity is direct current, need to be converted into constant frequency voltage or frequency modulation voltage alternating current, to be used for the load, especially for the use of general household load.
Then you need a converter, the converter is called the inverter. If it is a reverse conversion, from AC to DC, it is called a rectifier.
Off-grid systems are basically DC alternating current, so the inverter is the core of the whole system core.
Inverters are divided into grid-connected inverters, off-grid inverters, and off-grid inverters
1. Grid-connected inverter: can put the photovoltaic power, and the mains power, but the off-grid system output is not required to send out the electricity into the mains power grid, is basically self-produced and self-sold to local load use, so do not consider the off-grid system, the purchase of grid-connected inverter.
2. The off-grid inverter only serves the off-grid power generation system without the function of integrating the mains power grid, so as to realize self-production and self-use of distributed power generation.
3. And the off-grid inverter is equipped with both functions. If the off-grid system on your side has the possibility of grid connection in the future, besides its own production and use, you can consider choosing this one to reserve for future grid connection. This is generally more suitable for large off-grid power generation systems, there is too much power generation and to the mains may be.
But the off-grid inverter is more expensive, if your off-grid system has no grid-connected needs, is completely used for specific load, it is still more cost-effective to choose pure off-grid inverter, generally suitable for small and medium-sized off-grid system.