[Nut-upsuser] charge calculations (ex Ablerex MARS)

[lonely wolf]

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).