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

[Kirk Herander]

SolarBOS can possibly make one custom for you, it will be listed, and it
will not be cheap. I was going to order a 2000A w/ multiple OCPDs on both
inputs and outputs from them, but then Midnite came out with a 2000A
combiner, and I don't need it listed for my application.

On Sat, Sep 10, 2022 at 6:15 PM William Miller via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Mac:
>
>
>
> Getting listing on something as specialized as you are talking about may
> be difficult.  I would turn to the telecom industry for solutions.  Here is
> one link
> <https://bertholdelectric.com/dc-telecom-products/battery-termination-bars/>
> I found.  Their product line is pretty sexy and it is listed.
>
>
>
> If you are rolling your own, you can find ampacities for standard copper
> bar thicknesses someplace like here
> <https://www.copper.org/applications/electrical/busbar/busbar_ampacities.html>.
> You might fabricate something that looks like one of these
> <https://millersolar.com/MillerSolar/Portfolio/Inverters/battery_iinverters/JP_Radian/Images/Battery_busses_open.jpg>
> but bigger.  Threading is desirable so you can avoid wrangling nuts on the
> back sides, but tapping copper at a reasonable bolt size (likely 3/8-16)
> can be tricky.  I am looking for any excuse to buy one of these drill
> presses
> <https://www.grizzly.com/products/teknatool-18-nova-voyager-dvr-variable-speed-drill-press/t30589>
> which can automatically chip-clear.  Basically at this point in my life my
> only reason for working is to support my tool addiction.
>
>
>
> Good luck.
>
>
>
> William Miller
>
>
>
> 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 *Mac Lewis via RE-wrenches
> *Sent:* Thursday, September 8, 2022 8:46 PM
> *To:* RE-wrenches
> *Cc:* Mac Lewis
> *Subject:* [RE-wrenches] Large current battery combiners, UL Listing
>
>
>
> Hello Wrenches,
>
>
>
> Is anyone aware of a high current, (~3000A DC rated, 48Vdc nominal)
> battery combiner panel that would allow for ~36-48 x 4/0 cables to connect?
>
>
>
> Seems like nothing will be close to UL listed on this.  How do you go
> about building a 60 kW off-grid system on the battery side of things?  Do I
> need to increase battery voltage design?
>
>
>
> I have gotten a custom busbar fabricated by Storm Power rated for about
> 2kA before, but I'd love to have a UL Listed solution for large battery
> combining.  Any suggestions are appreciated.
>
>
>
> Thanks!
>
>
>
> --
>
>
>
>
>
>
>
> Mac Lewis
>
> "Yo solo sé que no sé nada." *-Sócrates*
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-- 

*Kirk Herander / **kirkh at vermont.solar <kirkh at vermont.solar>*

*Owner|Principal, VT Solar, LLC*

*Celebrating our 31st Anniversary 1991-2022!!*

*www.vermont.solar*
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dba Vermont Solar Engineering

802.863.1202
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