I'd agree with Royce, W3IF. I too had a power supply across my battery bank for my sump pump. It was a really nice Hewlett-Packard 6264B adjustable 0 - 20 volts @ 20 amps.
One day after switching off the AC, the power supply started to smoke ! Upon investigation, it was repairable since only a 5 watt resistor burned up in the crowbar circuit. I soon added a large diode in series with this supply in the positive lead feeding the battery bank. Never again will I use a power supply directly across batteries without a series diode. John VE3AMZ ----- Original Message ----- From: "Dave VanHorn" <[EMAIL PROTECTED]> To: <[email protected]>; <[email protected]> Sent: Saturday, April 09, 2005 9:43 AM Subject: Re: [Repeater-Builder] astron rs50 > > > > > >Better use an isolation diode... > >The linear Astron supplies I have worked on have a "crowbar" > >on the output. If it fires, it will foldback the supply causing no problem, > >but also put a dead short across the battery!! Not cool.. > >Royce - W3IF > > The crowbar would then pop the fuse that I put at the battery.. > > I guess I'm overly conservative, but I'm using #8 wire fused at 30A > (aka "aw shit fuses") between the battery and the charger, and the > battery and the system. These fuses are located right at the B+ > terminal. On the other end of the battery cable, there's a breakout > that has six taps with fuses sized per the loads. The basic rule is > that the wire has to be rated for continuous current at the fuse rating. > > Spare fuses in the cabinet of course. > > > > > > > > Yahoo! Groups Links > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
