How to choose inverter thin-film modules

New Energy Co., Ltd., Guangdong Bao Wei not only provide customers with professional stent design for the total package provides turnkey photovoltaic power plant construction services, with professional knowledge and rich experience, Paul Wei inverter for supporting the selection of components and also can give constructive comments.

Since crystalline silicon cell module fill factor is high, the peak point of the inverter is easy to find, but amorphous silicon thin film battery pack is relatively low fill factor, IV curve is gentle, the grid connected inverter need to set the step voltage tracking MPPT to find the peak point.

Meanwhile amorphous silicon thin film batteries need negative ground, in order to discharge static electricity and prevent common mode voltage to ground exceeds the system voltage and the inhibition photovoltaic array panels on the distributed capacitance of the inverter control circuit common mode interference. So you must use an internal or external transformer isolation (including step-up transformer) for grid inverters, grounding lines need to add DC leakage protection device to protect the personal safety.

Combining the above reasons, on negative ground can use the following improvements: negative ground is not grounding lightning protection components, but mainly to prevent static electricity, so you can use indirect grounding method, using a large value resistors indirectly grounded to avoid causing direct ground with no transformer-isolated modified sine wave inverter incompatibility problems.

Since the grounding resistor through the actual current is very small, will not cause the inverter without transformer-isolated DC leakage alarm, while the DC grounding line leakage protection settings can play a small role in protecting the safety of personnel. The only downside is indirectly grounded in the inhibition of cell panel distributed capacitance of the inverter reduces common mode interference aspect, and this problem can be reduced distributed capacitance (eg with no border component) and the inverter internal circuitry to improve noise immunity resolved, and now most of the inverter can be fit.