Panel fit and battery backup sizing
The 6EP1935-6MD31 is a 2.5 Ah valve-regulated lead-acid battery module for the SITOP DC UPS family, snapping onto a DIN rail EN 60715 35x15 or mounting via keyhole slots for M4 screws — it fits in the same footprint as the UPS module it backs up. At 20 °C the battery delivers a typical 10-year float life; at 40 °C that drops to 3 years, and at 60 °C to 1 year — the temperature derating curve is steep, so the panel's ambient temperature directly sets the replacement interval. Capacity falls to 80 % of original per EUROBAT guidelines, which is the normal end-of-life threshold for this lead-acid chemistry — plan for periodic capacity checks if the load profile is critical.
Charge voltage compensation across temperature
The recommended float voltage varies with ambient temperature: 29 V at -10 °C, stepping down to 26.4 V at 60 °C — the SITOP UPS module adjusts its output to this curve automatically when paired with the battery temperature sensor. Terminal connections are screw-type, accepting 0.08 to 2.5 mm² wire for both + BAT and - BAT — the same gauge used for the UPS output, so no adapter terminal is needed.
Lifecycle and regulatory standing
Carries cURus recognition per UL 1778 and CSA C22.2 No. 107.1 (File E219627), plus shipbuilding approvals from ABS and DNV GL — it is accepted in marine and industrial control panels that require third-party listing. ATEX rating is No — this module is not certified for explosive atmospheres; install outside hazardous zones.