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Thremal Dissipation versus calculated BTU/hrs
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If the UPS is powering a 6400W load, then the 6400W is not escaping as thermal energy like a huge toaster oven -- it's doing work to drive the downstream electronics.
Any thermal dissipation is a result of the way the UPS produces its output, including any inefficiencies in its design. The 3485BTU/hr spec is for an 8kVA chassis with 3 power modules operating at 100% load (6400W / 8kVA) and already fully charged. If this same system is rapidly charging the batteries the thermal dissipation is 6472BTU/hr.
Those two values would be the "worst-case scenario" specs for normal online (charged) and online (actively re-charging) modes for that chassis. If you run the UPS at less than its maximum load capacity, the thermal dissipation would obviously be less.
If the UPS is powering a 6400W load, then the 6400W is not escaping as thermal energy like a huge toaster oven -- it's doing work to drive the downstream electronics.
Any thermal dissipation is a result of the way the UPS produces its output, including any inefficiencies in its design. The 3485BTU/hr spec is for an 8kVA chassis with 3 power modules operating at 100% load (6400W / 8kVA) and already fully charged. If this same system is rapidly charging the batteries the thermal dissipation is 6472BTU/hr.
Those two values would be the "worst-case scenario" specs for normal online (charged) and online (actively re-charging) modes for that chassis. If you run the UPS at less than its maximum load capacity, the thermal dissipation would obviously be less.
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