I posted some messages about my investigations about the charger circuitry to the group more than one year ago.
You can use 12V marine deep-cycle batteries (120 A Hr) to power the switch. I think that I calculated 24 hours of run on a fully loaded swithc from one set of two. The charger only trickle charges the batteries. After the batteries discharge, you will want to use something else to charge them. I believe that you will want to set something up that allows disconnecting batteries so that you can connect them to an external charger. I started to set this up for the one system that I manage, and then the system owner (my spouse) lost interest. I had purchased heavy duty connectors and was going to connect them to the batteries through 50 A fuses on both sides so that I could rapidly remove them and charge them, but I still would be protected ffom accidental shorts. In your case you might want two sets of connectors to the phone with diodes isolating the batteries so you could swap batteries out. Best regards, Paul H. Gusciora ----- Original Message ----- From: "Brent" <[EMAIL PROTECTED]> To: <[email protected]> Date: Mon, 8 Sep 2008 12:37:32 -0700 Subject: KX-T: Extended Battery Back up for Kx-td1232 I live in an area with earthquakes and winter storms. When the power goes out, it is usually out for 8 - 48 hours, which is longer than the normal battery back-up lasts on the telephone switch. I would like to have a battery back-up that would last 1-4 days for my kx-td1232. I currently have the regular battery back-up system with it's two little lead/acid batteries and the charger/controller box that plugs into the switch. Are there any plans, information, specification, or wiring diagrams that would allow the use of larger gell cells or Optima batteries? I would not want to put large batteries on the little charger build for the switch. Thank you in advance for your help. Brent. [EMAIL PROTECTED] _________________________________________________________________ KX-T Mailing list --- http://kxthelp.com/ Subscription changes: http://kxthelp.com/mailman/listinfo/kxt
