DC contactor [RE-wrenches]

[allan]

Sparky,
What was that about bringing power in on both AC1 and AC2? If the Trace
senses AC power at both, it automatically drops out AC2, to prioritize the
grid.  Were you thinking 20A in on AC1 and 60 on AC2?

Allan @+E

-----Original Message-----
From: R. Sparks Scott <sharkey at mrsharkey.com>
To: RE-wrenches at topica.com <RE-wrenches at topica.com>
Date: Thursday, October 12, 2000 6:19 PM
Subject: Re: DC contactor [RE-wrenches]


>
> Kurt;
>
> You do have some options here, but a few questions first:
>
> 1) Do you want/need the full 60 amp pass through on the Trace? If the grid
>intertie and battery charge current is all that you need to handle on the
>AC1 input, you could breaker it for something like 20 amps and use a
>smaller relay. If you wanted the full current available, consider also
>using AC2 in with a separate breaker in the event you needed to lay a heavy
>charge on the batteries, etc. You didn't mention a generator. Obviously, if
>this input is already used, it's not a option to use AC2.
>
> 2) Do you have to switch the neutral along with the hot leg? My system has
>the neutral running straight to the neutral buss inside the Trace. Don't
>know the code on that. You'd get by with one less set of contacts.
>
> I looked in the Grainger catalog, and the only thing available in a 60 amp
>current range is mercury relays, and they are all 120/240 volt coils. You
>could use one of these with another 24 volt relay to switch the 120 volt
>coil voltage... not elegant, but it would work.
> If I had to have the full current, I'd probably go for a solid-state relay
>set-up. Newark Electronics has a large selection, some of them are "double
>pole", and operate on DC control voltages from 3 to 48 VDC. They feature
>quite a few that will handle 75 amps RMS and 1000 amps surge. Let me know
>if you want to know more about this, I'll comb the catalog more carefully
>to get you some part #'s and $'s. The solid state relays have
>zero-crossover switching, no arcs. In larger current systems, they may need
>an inexpensive heat sink to stay cool.
>
> -S
>
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For info contact list moderator by email:
 michael.welch at homepower.com
___________________________________________________________
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