We've been using the APC SmartUPS 750XL as a Tower UPS for several
years. Put 2-8 100+AH AGM Batteries on them, and they've been rock
solid for us. I can think of only a handful of failures in the dozens
deployed over the last several years. I used to source them off ebay
for $50-$70 each, but they're becoming more and more scarce. Anybody
have a recommendation for a simple UPS that will do all the monitoring
that the APC does and accept big batteries?
We're a Metro-Rural Area, our power outages are usually measured in
Hours, not days. So I'm not as concerned with the inefficiency of doing
the DC/AC/DC Conversion for Runtime, just power stability during
outages/fluctuations. I like the ease of connecting the external
batteries to the APC, since the XL line has an Anderson plug on the back
for them, and has a larger charger than the normal UPS, so recharge
times are very quick.
When the boss goes to the WISPA Shows, his head is filled with all kids
of ideas, so he want's me to investigate doing everything as a DC Plant,
When I price that out, with chargers, voltage converters (24/48),
inverters, fuse protection, LVD, Monitoring, etc, it always seems like
the price is a couple hundred dollars of parts and it would be cobbled
together.
Am I missing something with doing a DC Plant? I see the telco's at the
sites using a rackmount rectifier with power supply modules, but those
are a several hundred by themselves, and they are only 48V, they don't
have to worry about 24v radios. When I build a site now, I drop in 2
batteries, and the APC, and the site is up and running in a couple
minutes. A DIN rail with a couple power supplies and the box is done,
and has fully monitored power, and I can plug in whatever I want without
any equipment modifications.
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