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

William Miller william at millersolar.com
Fri Dec 2 12:39:00 PST 2022


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

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
on line that has provided me with some valuable insight on different styles
of taps.


Miller Solar

17395 Oak Road, Atascadero, CA 93422



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:


             Are you using kerosene as a cutting fluid?  We've had
better luck with that in softer than steel metals.


Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
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


mjmorningstar at gmail.com
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