At 30V, 50°c ambient those caps (35V, 85°) should last around 13,000 hrs. (4hrs a day for 10years). Changing to 50V 85° caps increases that to 19,000 hrs. Changing to 35V 105°c caps increases that to 52,000 hrs! So the big killer is temperature, anyone know how hot these boxes get?Great performance!
I'm just concerned about the long-term reliability. It seems like Topping uses 35V capacitors with 30V DC on them (60V from power supply / 2).
What is the effect on MTBF? As a design engineer, I understand the choice. But if my company designs something to serve for at least 10 years, my reliability engineer would not allow me to use the electrolytic cap spec'ed for anything below 50V.
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Electrolytic Capacitor Life Calculator - Power Electronics Calculators and Tools
This calculator will compute W, dBW, and dBm Conversion.