Analysis: All of Growatt's on-grid inverters will take the insulation resistance test between panels to ground before starting up. If the positive and negative poles of the string are short-circuited to the ground, it will damage the inverter. Therefore, when the "PV insulation resistance is too low" occurs in the inverter, it needs to be dealt with in time. You can use a multimeter to measure whether the resistance of the positive and negative pairs of the string is lower than 50KΩ. If it is lower, which means that there is leakage in the modified line. Or use a multimeter to measure the voltage of the positive and negative poles of the string to the ground. If it is purely at a certain voltage value, it also means that the line is purely leaking.
Solution: Check out the string with leakage current and make rectification. If there is no problem with the wiring, consider replacing the inverter.
Analysis: Normally, the DC voltage of Growatt single phase inverter could up to 550V, for three-phase inverter, it is 1100V. When the string voltage exceeds this value, the inverter will report that the PV input voltage is too high.
Solution: Check each string to ensure that the total PVs' open-circuit voltage of the string is lower than the highest value of the inverter. At the same time, the influence of the ambient temperature on the component voltage needs to be considered.
E-MAIL:
PHONE:
Address:
Building B, SF Fengtai Industrial Park, Shushan District, Hefei City, Anhui Province, PR China
Follow Us
Our best-selling products are solar energy battery, all black solar panel, off grid and hybrid solar systems. Welcome to order and customize!
Business license