[RE-wrenches] Large current battery combiners, UL Listing

[Jerry Shafer]

Wrenches, William
I did a few back up systems for data hubs, we had 250+ kWhr systems. We had
to have a firewall between the batteries and everything else. We used
copper stock 1/2 x 2" and 20' long, each bank connected to the buss with
its own 250 a breaker, the buss was above the batteries mounted to SS strut
using 1000 volt insulators on both positive and negative. The power
conditioners were on the opposite side of the wall again all connected to
the buss going to each unit and again protected. Was very clean, no line
loss, very clean and was duplicated in several locations. We also had a 125
k cummins  genny outside that would take over to keep us all connected.
Jerry
PS, we did not tap and we used brass bolts and nuts, l dont recall why but
it may have not been able to torg enough.


On Fri, Dec 2, 2022, 12:42 PM William Miller via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Colleagues:
>
>
>
> I am gearing up to tap some more copper.  I assume this is a pertinent
> subject since bus bars are going to be needed frequently for any storage
> work.
>
>
>
> I bought the fancy drill press with the tapping function and I am setting
> it up.  I ran a few tests and the functionality of the tool is pretty
> amazing.  I still need to work on programming it to reverse when needed.  I
> am close.  I also ordered a cross vise for part holding.
>
>
>
> I found this tutorial
> <https://www.youtube.com/watch?v=bkrUzGooA9k&ab_channel=HaasAutomation%2CInc.>
> on line that has provided me with some valuable insight on different styles
> of taps.
>
>
>
> William
>
>
>
> Miller Solar
>
> 17395 Oak Road, Atascadero, CA 93422
>
> 805-438-5600
>
> www.millersolar.com
>
> CA Lic. 773985
>
>
>
>
>
> *From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
> Behalf Of *Michael Morningstar via RE-wrenches
> *Sent:* Monday, September 12, 2022 7:39 PM
> *To:* RE-wrenches
> *Cc:* Michael Morningstar
> *Subject:* Re: [RE-wrenches] Large current battery combiners, UL Listing
>
>
>
> No, I haven't. I'll do some testing tomorrow as we have 60 holes/taps to
> do in the above mentioned bussing
>
>
>
> On Mon, Sep 12, 2022 at 7:54 AM frenergy via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> Michael,
>
>              Are you using kerosene as a cutting fluid?  We've had
> better luck with that in softer than steel metals.
>
> Bill
>
> Feather River Solar Electric
> Bill Battagin, Owner
> 4291 Nelson St.
> Taylorsville, CA 95983
> 530.284.7849
> CA Lic 874049
>
> On 9/11/2022 7:00 PM, Michael Morningstar via RE-wrenches wrote:
> > We've gotten around needing UL listings for one-off in house
> > fabrication by running things through a licensed engineer. Right now
> > we are building a gutter bus which has two 1/2" x 4" x 20' copper bars
> > in a 10" x 10" gutter. We are using 2" x 9" x 9" UDPM plates with
> > slots routed out for the bars as insulators. This is for 24 Discover
> > AES and 8 Sol-Ark's. It usually costs about 1K to have an engineer
> > sign off on our designs.
> >
> > I'd be interested in learning tricks for tapping 3/8" in thick copper.
> > I've never been able to get consistent results and resort to
> > thru-bolting.
>
>
> --
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> --
>
> Michael Morningstar
>
>
>
> Morningstar Electric
>
> PO Box 1494
>
> Mount Shasta, CA 96067
>
> 530-921-0560
>
> mjmorningstar at gmail.com
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