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

[William Miller]

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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