We purchase used APC UPS's on Ebay for around $50. Search for Item 160231636080 to see an example. We remove the batteries that come with it (if there are any). We create a couple of cables to go from the UPS battery inputs to the external battery pack that we assemble.
For the external battery pack, we purchase Deep Cycle (Trolling, not Starting) batteries from Sams Club or Wal-Mart. We usually get the 125 amp hour ones. Since the UPS's are 24 volt, you need to purchase them in groups of two, since the batteries are 12 volt. These are not maintenance free, like AGM batteries, but that also cost less than 1/2 of AGM. We create cables to go from the positive terminal of one battery to the negative terminal of the second battery. This creates a 24 volt battery pack. Then you run a cable from the open positive terminal of the battery pack to the positive connection on the UPS. Same with the negative side. So, for less than $300, you have a 24volt, 125 amp hour UPS system. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Patrick Nix Jr. Sent: Thursday, April 24, 2008 6:03 PM To: wireless@wispa.org Subject: [WISPA] A good battery solution Any ideas on an inexpensive but effective battery solution for remote tower location... would like to keep equipment powered 6-8 hours w/o electric. Equipment includes 1 mikrotik, 1 trango Link45 and 1 trango M900AP Thanks __________________________________________ Patrick Nix, Jr., csweb.net (800) 638-2614 http://www.csweb.net <http://www.csweb.net/> E-Mail: [EMAIL PROTECTED] ==================================================================== ATTENTION: This e-mail may contain information that is confidential in nature. If you are not the intended recipient, please delete this e-mail and notify the sender immediately. Thank you. ==================================================================== ---------------------------------------------------------------------------- ---- 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/
