If the solar power input is reversed, the power will form a short circuit through the anti-parallel diode. According to the characteristics of the solar module, the voltage of the solar power supply When pulled down, the voltage value is only the sum of the forward voltage drop of the two diodes, which will not damage the electrolytic capacitor.
In this scenario , the inverter will show that the input voltage of the MPPT is 0V and this condition will not damage the inverter, but the short circuit will damage the PV modules. In the same channel MPPT, the polarities of the two PV strings are reversed
Solar panel, battery, charge controller and inverter. What is Reverse Polarity? If you get two different readings, one positive and one negative, your system has reverse polarity. Reverse polarity can be caused by incorrect wiring or damaged equipment.
As shown in the figure above, the polarities of the 2PV strings in the same MPPT are reversed. After the DC switch of the inverter is closed, each string forms a short circuit with the IGBT anti-parallel diode of the booster circuit through the DC switch and is turned off.
If you hook up a solar panel backward, the system will not work correctly. The output of the inverter can be affected because it cannot correctly detect whether or not there is enough electricity from the generator to power your home/whatever device is hooked up!
If you have an inverter incompatible with your new solar panels, the polarity of the generator may be reversed. To fix this, open up your circuit breaker box to expose all wires coming into it.