Power Inverter

The first stage: It is a DC to DC conversion process that raises the lower voltage DC at the inverter input to 300volts DC.
The second stage: It Is a actual inverter stage that convert the high 110 voltage DC Into 110volts or 220 volts AC (ms). The DC to DC convert stage uses modem high frequency power conversion techniques that have replaced the bulky transformers found in less technology-advanced models. The inverter stage uses advanced power MOSFET transistors in a full bridge configuration.

CAR, PID, MS/MSD series inverter is known as "modified sine wave", P, PX SK series inverter is pure sine wave"

• Modified sine wave is more economic than pure sine wave inverter when work with resistance load 
• Compared to modified sine wave, there is very little harmonic distortion in pure sine wave inverter which can lower down the risk of damage to your sensitive appliances. These device with control circuits are very sensitive to the phase of speed/voltage control or instantaneous zero voltage crossing (for timing control), such as capacitive load and inductive load. For pure sine wave inverter has so many advantages, so it can be used as emergency inverter and car dc to ac converter  

How to choose power inverter:
In photovoltaic off-grid systems, the power of the off-grid inverter is usually determined according to the customer's load type and power.
The loads starting power should be taken into account when estimating the power of the inverter.

Resistive load: The load with no voltage phase difference is a resistive load, such as rice cooker, light bulb, electric furnace, electric ferrochrome, etc.
The load power can be same as inverter rated power.

Capacitive load: When current ahead there will be voltage phase difference is a capacitive load, such as compensation capacitors, computers, TVs, etc.
The load starting power needs 2-4 times of inverter surge power.

Inductive load: When current lag there will be voltage phase difference is an inductive load, such as washing machines, air conditioners, refrigerators, water pumps, range hoods and other loads with motors, transformers, relays, compressors, etc. The load starting power needs 5-7 times of the inverter surge power.