One battery you might look into using is the Optima Red and Yellow-Top series. These are sealed gel batteries designed for offroad and other harsh automotive conditions. I have one of these in my car for running the stereo system and computer gear and they work great. The Red and Yellow models have to do with whether the battery is deep-cycle or not. The deep cycle is probably what you are looking for since you can "deep cycle" it (e.g. charge it and then use it until nearly dead, then charge it again) as with marine use.
The nice thing is they are literally "no maintenance". Since they contain gel electrolyte, there is no need to add water; they are totally sealed. In fact they are designed for racing so even if the battery is cracked open and part of the gel is lost, they keep working. Also, you can mount them anywhere, even upside down without problems! They run around $100-125 and can be found at many automotive stores such as Auto-Zone, Pep Boys, etc. --Jason -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Todd Hansen Sent: Monday, March 24, 2003 9:13 AM To: Roberto Ramirez Cc: Joel Jaeggli; bawug Subject: Re: [BAWUG] ap from car battery Car batteries are designed for a high load at a short duration. They don't provide as much power to a trickle load like an access point. A gel cell or AGM type battery and a lot of marine batteries (commonly deep cycle) provide better support for low volume loads. If I were looking for the most cost effective means I would go with a marine battery and see how well that works. if it is not sufficent then Gels or AGMs are the way to go (although even a 33 AH AGM battery can run you $50 and a 100 AH is $125). Depending on the voltatge input range for your device, you willl need DC-DC converters. I noticed that a lot of the PoE APs have a wider input range then walwort powered APs. For example a wi-lan VIP110-24 can be powered direct from battery as its range is greater than LVD and HVD cutoffs. On Sun, 23 Mar 2003, Roberto Ramirez wrote: > I was thinking something like a solar powered unit. by using a car battery I > could save some money on the batteries. I was checking out some websites and > the get pretty expensive but I guess its because of the no- maintance type > of batteries. > > -- > general wireless list, a bawug thing <http://www.bawug.org/> > [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless > -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
