Return-Path: Received: from imo13.mx.aol.com ([198.81.17.3]) by truman.olsusa.com (Post.Office MTA v3.1.2 release (PO203-101c) ID# 0-44819U2500L250S0) with ESMTP id AAA12807 for ; Sun, 27 Sep 1998 09:56:23 -0400 Received: from ReganRanch@aol.com by imo13.mx.aol.com (IMOv16.10) id 8GKQa13872 for ; Sun, 27 Sep 1998 09:56:18 -0400 (EDT) From: ReganRanch@aol.com Message-ID: Date: Sun, 27 Sep 1998 09:56:18 EDT To: lancair.list@olsusa.com Subject: Varistor Voltage X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Hello Marv: When selecting a voltage for your varistor there are two requirements; it must be higher than any anticipated "normal" voltage and lower than voltage required to arc across the opening contacts of the switch controlling the solenoid. Jim used 18 volt rated MOVs in his 12-volt system and that would be the lowest I would use. 14 volts is definitely too low as a 12 volt system regularly regulates up to 14.6 volts to charge the battery. BTW although MOVs have very high current capacity they can only absorb a limited amount of power. Exceed that limit and the result is a loud "failure report". New DigiKey #P7315-ND (sorry about the old #, got it off of the bag). Brent