# Inverter Isc DC Input Ratings

Inverter short circuit current (Isc) rating is required to verify that the PV module string short circuit current under high irradiance does not exceed the maximum input current for the PV inverter's MPPT for compliance with NEC 690.8(A)(1)(1) and the inverter listing. Inverter Isc might not be reported consistently across manufacturers, if you are having trouble finding the required information on your equipment or interpreting manufacturer documentation please refer to the following examples:

The Sunny Boy inverters have a maximum short circuit current of **18 A** and “Maximum DC Voltage” of **600 V**:

The Delta Mario inverters have a “Maximum System Voltage” of **600 V** and max MPPT current of **15 A** M4 to M8 and **25 A** for the M10:

The Tesla inverter has a max MPPT current of **15 A** and a maximum input voltage of **600 V**:

The Fronius inverters have a maximum short circuit current of **18 A** and a maximum input voltage of **800 V**

Delta E6 has a “DC Max System Voltage” of **480 V** and a "Maximum input current per MPPT" of 12 A which makes the maximum input short circuit current of 12*1.25 = **15 A**