RENAC released a new series of inverters R3 Pre series 10~25 kw using the latest power electronics technology and thermal design technology to increase the maximum DC input voltage from the original 1000V to 1100V, it allows the system to connect more panels, also can save cable costs. At the same time, it has 150% DC oversize capability. The maximum input current of this series inverter is 30A per MPPT, which can meet the needs of high-power PV modules.
The Imp of PV modules was around 10 to 11A in the past, so the maximum input current of the inverter was generally around 11 to 12A. At present, Imp of 600W+ high-power modules has exceeded 15A that is necessary to select an inverter with a maximum 15A input current or higher to meet high power PV module.
The following table shows the parameters of several kinds of high-power modules which used in the market. We can see that the Imp of the 600W bifacial module reaches 18.55A, which is out of the limit of most of the string inverters on the market. We must ensure the maximum input current of the inverter is greater than the Imp of the PV module.
When configure a solar system, one can consider DC oversize. DC oversize concept is widely adopted in solar system design. Currently, PV power plants worldwide are already oversized on average between 120% and 150%. One of the main reasons to oversize the DC generator is that the theoretical peak power of the modules is often not achieved in reality. In some areas where with insufficient irradiance, positive oversizing (increase PV capacity to extend system AC full-load hours) is a good option. A good oversize design could both help the system close to full activation and keep system under healthy condition, which makes your investment worthwhile. According to the calculation, the Renac inverters can perfectly match the 500W and 600W bifacial panels.
