... surges,spike,blackput,shortages,outages,poor-quality supply Guiding steps for cost effective UPS selection1. First stage: Prepare specification to ... , beyond thestandard battery coming with the UPS.You might pay for a bigger UPS, already equipped with the battery size ... fails.Check possible combinations to find the lowest cost. For instance, for a redundant system supplying 20kVA load, compare the cost ...