JLC is a smarta$$. :-) Yes, I was referring to double-conversion systems. I guess I should've spent a few more sentences explaining that. The front-end for those systems tends to be a large capacitor bank feeding into a rectifier that then leads to the battery charger(s). This protects against under-voltage, over-voltage, and no-voltage conditions as well as the spiking that often occurs when utility power comes back online.
They cost more up-front, because they act as isolation as well as UPS, but they are well-worth the expense (IMO). They also allow you to easily feed a generator (or any other stored-power system) back into the power-matrix without, again, needing a transfer switch. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Kurt Buff Sent: Thursday, September 29, 2016 8:38 PM To: ntsysadm Subject: Re: [NTSysADM] RE: Transfer switches On Thu, Sep 29, 2016 at 5:23 PM, Joseph L. Casale <[email protected]> wrote: >> I now always recommend power that is "always on". > > Nice:) Yep - something like this is what i suspect he means: https://en.wikipedia.org/wiki/Uninterruptible_power_supply#Online.2Fdouble-conversion and https://www.cyberpowersystems.com/products/ups/smart-app-online/ol1000rtxl2u Kurt
