Pinit Please Contact Customer Service for Availability SMA DC Surge Protection Kit Type2 1/2 for STP50-40 SKU: SMA-DC_SPD_KIT5_T1T2 DC Surge Protection Upgrade Kit for SMA Sunny TriPower 50kW inverter models (STP 50-40 and STP 50-41) Login for pricing DESCRIPTION SPECIFICATIONS PDFS, DOWNLOADS & VIDEOS Type I/II DC Overvoltage Protection retrofit kit for TriPower Core1 50kW inverters