The practical problem with this is that much of the 24vdc POE equipment (like UBNT and Mikrotik) doesn't like more than 25 volts or so. They sort of expect voltage drop rather than voltage increase. A 24vdc battery system will be about 28 volts in actuality.
That issues aside, it is an efficient and simple way to power things and not much different than an efficient solar system except you have almost unlimited power from the charger(s) for less initial expense than the solar system. The usual transformer based auto part store battery chargers aren't all that efficient. If you do this, go with something with a switching power supply if efficiency is important. There are many choices and places like jameco/jdr/ebay can get you all you want. Just make sure your power supplies wattage can handle the loads+charging. On Wed, Sep 01, 2010 at 09:51:55AM -0400, David Sovereen wrote: > With nearly all of our equipment being 24V DC, is anyone running their sites > off of batteries connected to an AC battery charger? I'm envisioning > something like a solar setup, but instead of using solar panels to charge > the batteries, you use an AC-powered battery charger. This would eliminate > the AC to DC to AC to DC conversion that a typical UPS setup would > introduce, making the efficiency far better and the run-times far longer. > I'm thinking I would like to do this (I need to revamp our UPSes everywhere > anyway) but am not sure of what pieces and parts I need or if this is a > terrible idea that I should run away from. > > Dave > ============================== > MERCURY NETWORK CORPORATION > David Sovereen > 989-837-3790 x 151 > > > > On Wed, Sep 1, 2010 at 1:16 AM, Robert West <robert.w...@just-micro.com>wrote: > > > Sadly............. My last UPS I built was from parts pulled outta the > > dumpster behind the local defunct Gold Star Chili Store. Salvaged the > > EXIT > > sign. 2 6v batteries and charging/switch board. > > > > I live a strange life. > > > > Bob- > > > > > > -----Original Message----- > > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > > Behalf Of Paul Gerstenberger > > Sent: Tuesday, August 31, 2010 1:18 PM > > To: WISPA General List > > Subject: Re: [WISPA] UPS with IP > > > > I second this. We had been using Belkin consumer UPS' because of their > > physical dimensions, but we've been changing them out for APC 750 and 1500s > > with SNMP where ever we reasonably can. Get ours new through Ingram Micro. > > > > -Paul > > > > On Aug 18, 2010, at 3:43 PM, Mark Nash wrote: > > > > > I usually buy APC SmartUPS 1500KVA, used on ebay with SNMP card > > AP9617...this card emails you if the UPS goes on battery. > > > > > > Mark Nash > > > UnwiredWest > > > 1702 W. 2nd Ave > > > Suite A > > > Eugene, OR 97402 > > > 541-998-5555 > > > 541-998-5599 fax > > > http://www.unwiredwest.com > > > ----- Original Message ----- > > > From: Steve Barnes > > > To: WISPA General List > > > Sent: Wednesday, August 18, 2010 1:51 PM > > > Subject: [WISPA] UPS with IP > > > > > > I am looking for a 1500VA ups with IP control that wont kill me with the > > price. > > > > > > Steve Barnes > > > RC-WiFi Wireless Internet Service > > > > > > > > > > > > > > > > > > > ---------------------------------------------------------------------------- > > ---- > > > WISPA Wants You! Join today! > > > http://signup.wispa.org/ > > > > > > > ---------------------------------------------------------------------------- > > ---- > > > > > > WISPA Wireless List: wireless@wispa.org > > > > > > Subscribe/Unsubscribe: > > > http://lists.wispa.org/mailman/listinfo/wireless > > > > > > Archives: http://lists.wispa.org/pipermail/wireless/ > > > > > > > > > > > > > ---------------------------------------------------------------------------- > > ---- > > > WISPA Wants You! Join today! > > > http://signup.wispa.org/ > > > > > > > ---------------------------------------------------------------------------- > > ---- > > > > > > WISPA Wireless List: wireless@wispa.org > > > > > > Subscribe/Unsubscribe: > > > http://lists.wispa.org/mailman/listinfo/wireless > > > > > > Archives: http://lists.wispa.org/pipermail/wireless/ > > > > > > > > > > ---------------------------------------------------------------------------- > > ---- > > WISPA Wants You! 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