It's very thoughtful of Toronto Hydro to help calibrate my APC UPS for the newly added external battery pack. It still has a pessimistic estimate based on previous outages when it only had the internal batteries.
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I've had no issues so far with the BR1500G. I bought it specifically because it's a passive UPS with solid passive voltage regulation, so it doesn't waste significant energy or create noise when it isn't charging or providing power in an outage.
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Active UPS would be much worse for my needs and would cost a lot more. I have a high end PSU with a 10 year warranty anyway. The PSU is completely quiet too since it's very efficient (80 Plus Titanium) so it doesn't generate enough heat to need the fan.
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I care a lot about avoiding noise since it distracts me. I only have Noctua fans in my workstation which are nearly silent during regular use and not loud under full load. There are 2x 140mm that came with the NH-D15 CPU cooler, an 120mm exhaust (NF-S12A) and intake (NF-P12).