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

frenergy frenergy at psln.com
Mon Sep 12 07:59:12 PDT 2022


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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