The problem is. Using a battery on a power supply is that unless you run the power supply output at around 13.3 to 13.6 volts you are not properly "floating the battery. 13.8 volts is too high for most batteries and it will eventually cook the battery.
The other problem is, even at 13.8 volts, that is not high enough to properly recharge the battery after it has been discharged. It will never get back the proper charge at those voltages. To properly charge the charge voltage needs to be run up to around 14.3 volts. A 3 stage charger is required to do the job. Yes a couple of tenths of a volt does make a big difference in battery maintenance. 73 Gary K4FMX _____ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Don KA9QJG Sent: Thursday, May 24, 2007 12:25 PM To: [email protected] Subject: RE: [Repeater-Builder] Re: UPS <http://geo.yahoo.com/serv?s=97359714/grpId=104168/grpspId=1705063108/msgId= 72211/stime=1180018089/nc1=3848542/nc2=4025377/nc3=4609192> Tom I use a ASTRON RM 60M-BB (Battery Back Up} and a Optima Battery on My 440 Micor it switches Immediately when You get a Power Failure . You still use the same device that is used on the Micor for the 9.6, which in my case is a Little Regulator Board I do have a Panel mount Bird Wattmeter, and I do notice on Battery power the Wattage drops about 8 Watts. This is probably Normal with the Difference from 13.8 to 12 Volts no one will notice anyway. So the answer is Unless You are using something else other then the 13.8 Supply Voltage then a Reg for the 9.6 You don't need to change Anything. PS As Much as I like Motorola the Old Motorola Micor Power Supply as you know is Very Very Heavy and Parts were getting Harder to Find. Never had a Problem with any Astron Happy Repeater Building Don KA9QJG
