PWRIG500012120S is a 5 kW industrial‑grade pure sine inverter that converts 12 VDC from batteries to 120 VAC (50/60 Hz) using a DSP‑controlled MOSFET bridge and dual GFCI outlets for safety. Common failure modes include overheating of the MOSFET array or heat sink, burnout of the DSP or its protection ICs, tripping of the built‑in GFCIs due to ground faults, and degradation of the DC input fuses or battery voltage regulator when operating near low‑voltage thresholds. First‑check diagnostics should verify that the 12 VDC supply is within spec and stable, inspect all fuses and the heat sink for signs of damage or thermal stress, and use a multimeter to confirm clean 120 VAC output with minimal ripple before proceeding to component‑level testing.[oss-gpt-20b]