John, first off, you need to check the voltage rating of your 1-2-BOTH-
OFF switch, as most of them have, IIRC, a 36VDC maximum voltage
rating. :-(
The contactors I use are Tyco Electronics Kilovac EV200, and I use 12v
to actuate, one of their advantages being very low 12v holding current.
https://www.batteryspace.com/productimages/bms/Relayev200.pdf
Unfortunately I see they're rather pricy (I had picked mine up on a
surplus bargain shelf somewhere). Probably overkill for your
application.
Usually a safe bet to derate voltages and currents of power devices.
Even though 48v is not considered "high voltage", I usually like to
not string such voltages all over the place and the scheme you
described (separate 12v panel controlling a couple of power
contactors) would indeed be my preference.
JoeS.
On Mar 17, 2014, at 6:26, oak wrote:
>
>
>
> I am currently using two battery banks for a 48V system. I have the
> traditional "1, 2, both, off" selector switch.
>
> It's a tempting thought to install contactors (relays) so that I can
> have a small, low voltage 'control' panel where the switches are
> located. Part of me is trying to resist the urge. It adds more
> complexity, more opportunities for things to break or "go wrong".
>
> If I install contactors to switch the battery banks on and off, what
> is a good source? If my typical load is expected to be 25-40A, do I
> need to get at least a 80-100A contactor / relay, or is it safe to
> use a relay at close to full rating?
>
> John
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