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How to adjust the output voltage on our pure sine wave inverter 12v 220v 2000w if the output voltage is lower or exceed the standard range. Generally, we will adjust the voltage according to customer requirements before shipment. if the voltage exceeds or is lower than the normal voltage range, the reference video wlll help you. Remarks: 1. Measure the voltage must use RMS , otherwise the error would be great. 2. must be carried out under the guidance of professionals.

The loading time is not depends on inverter. The Use time depends on the size of the battery capacity . There is a formula:  Hours = battery capacity X battery voltage X 0.8X0.9 / load power   For example: a 12V 100AH batteryload a 220V 100W lights Working time = 12 (V) X100 (AH) X0.8X0.9 / 100 (W) = 8.6 (h)

Pure sine wave inverter  can better load high-power electrical products, such as motors, compressors, relays, etc.. Because inductive load  products need the current startup about 5-7 times than a normal operation . For example, a refrigerator need normal operation about 150 watts,But the starting power up to 1000 watts or more. Further, since the inductive load in an instant power or disconnect the power, it will produce a counter electromotive force voltage, peak voltage which is far greater than the inverter can withstand voltage, it can easily lead to the inverter instantaneous overload , affect the service life of the inverter.  Therefore, such a high electrical power supply waveform requirements. If you don't know whether modify or pure sine wave you choose. Hope it will help you.