Arjen de Korte wrote: >> I have two of these r3000, both with almost exactly the same load >> attached - each is about 2.2kVA. The other box does not trigger the >> fuse when power is reconnected. > > Nominal load depends on the amount of VA (or W) that a UPS sees. It > makes no difference if this is one load drawing 2.2 kVA or ten each > drawing 220 VA, the total load will be the same.
Sure, I understand that - these two actually have virtually identical 2.2kW loads, except UPS#2 has one extra PC hooked up too. > Surge (inrush) current is something different. Usually, PC/server > power supplies will peak around 20..50 A (each), with essentially no > dependency on the actual load. 20-50A startup surges?? > Adding just a single additional one may tip the scale. When it comes > to tripping fuses, you may be fine if you stay just below a certain > limit and will only notice a problem if you (just) exceed it. In my case, UPS#1 has the lowest load and is the one that trips the fuse (16A electronic) - UPS#2 has the extra PC (std desktop) and has no problem with the fuse. /Per Jessen, Zürich _______________________________________________ Nut-upsuser mailing list [email protected] http://lists.alioth.debian.org/mailman/listinfo/nut-upsuser
