Parts for high-current application

I want to build an automatic disconnect for a set of external batteries
I have on a UPS so I can charge them faster than what the built-in
charger on the UPS will do. However, I am having trouble finding parts.
The batteries take an 8mm bolt, and I want to stay consistent with the
batteries. The existing system is 1/0 and 2/0 cable so we're talking 150
amps.

In an enclosure, I want to have two binding posts, screw terminals, or
whatever they are called. The outside should accept an 8mm bolt for use
with a ring terminal. I plan on using 1/0 cable inside the box, so
connection by ring terminals is an option, although the largest bolt
hole I've seen is 1/2 inch. The bolt terminals should of course be
insluated from the enclosure. It's a 48 volt system.

I thought of using shoulder washers and a post or insert threaded for an
8mm bolt, also threaded on the outside, but haven't found that either.

Also, I need a 150 amp relay, 12 volts DC would be my preference.

The places I have seen on the web that almost get to what I am looking
for are marine/boating sites, with a few PV hits as well, but I have
still found nothing suitable.

Can anyone help?

Thanks,
Linus

 

150 AMP/12Volt Relay

sounds like an Automotive Start solenoid to me !

Yukio YANO

 

Simple FORD Start Relay with the Mains controlled by the Start terminal.
Connect batteries to the Starter Terminal, connect Charging Source to the
Battery Terminal, connect the Sense circuitry to the Start (Energize)
Terminal to switch it on when the battery level is requiring charging and
off when they reach required level. The vented enclosure can house the
batteries and the cables, the Start Relay can be mounted on the outside of
the enclosure. Any auto Parts Supplier can show you the various types and
configurations available. Rest of the circuitry should be academic in
design.

 

looking relay made for motorhome battery isolation will work. This can be
constant on. I have been using such for a long time. Purchased at a NAPA
automotive store. Warren