On 04/22/2006 08:17 PM, Charles Lepple wrote:
I think that the solution that APC and MGE apparently use (probably
others as well) on their PDC HID UPSes is better - do the charge
calculation in an on-board microcontroller, and calibrate it as part
of the final QA stage. If the manufacturer can't afford a couple extra
cents for a microcontroller that can do that math, the components will
probably drift over time anyway (making PC-side charge calculations
futile).
Of course the solution of computing everything in the UPS itself is more
accurate .. at least until you replace the batteries. But hey, you
cannot get on 600$ UPSs what you get for 1400$... At least _this_ was
the difference which made my CFO to approve the purchase of Ablerex
rather then APC (1250 Euro), MGE (1150 Euro) or even Liebert (Line
Interactive model - 900 Euro, On-Line - 1300 Euro).
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