Re: PTC protected dual battery harness

["Roland Moore" <nospam@xxxxxxxxxx>]

Come on man. It's a DSC panel. They just barely have their power out up to 1
AMP for the first time in the new "Power" series panels.
DSC panels are usually a little short on just about everything, so why
should they worry about having a PTC just for an 'extra' battery?

"Frank Olson" <use_the_email_links@xxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:FMXGj.128887$pM4.116154@xxxxxxxxxxxx
> Nomen Nescio wrote:
> >> How much more "backup" does he need?  Most panels can handle recharging
> >> up to a 14AH battery (2 7AH batteries in parallel will fit in most cans
> >> if they're not "overloaded" with wire).
> >
> > Frank, when more than one battery is connected in parallel, the correct
way
> > to do it is to use some sort of overload protection in the battery
leads.
> > Either a circuit breaker, a PTC device, or even a properly selected
fuse.
> > Suppose one battery develops an internal short:  the good battery will
> > start trying to charge the shorted battery, and hazardous amounts of
> > current can flow.
>
> I don't know whose batteries you've used, but "internal shorts" are
> extremely rare.  DSC's 1864 has provision for connecting two batteries
> in parallel (12v7AH).  There's no provision on the harness for an inline
> fuse or PTC device.  Interesting.
>
>
> >
> > A comment on the original poster's question:  I think it is monumentally
> > stupid for someone to take over 35 DMP panels (DMP's biggest and most
> > powerful panel, by the way) and not have a source for spare parts.  If
he
> > can't even come up with a battery harness, what's he going to do when he
> > needs a keypad or a loop expander, or when one of those XR500 panels
craps
> > out on Friday night?
> >
>
> Agreed.  But then there's always Jim R's garage...  :-)
>
> Frank Olson
> http://www.yoursecuritysource.com
>
> "It only implies that I don't sit back and let you post more false
> accusations without responding." -  Robert L. Bass