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

[Kirk Herander via RE-wrenches]

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@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
> 
> 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
> .
> You might fabricate something that looks like one of these
> 
> 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
> 
> 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-boun...@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*
> ___
> List sponsored by Redwood Alliance
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-- 

*Kirk Herander / **kirkh@vermont.solar *

*Owner|Principal, VT Solar, LLC*

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

*www.vermont.solar*


dba Vermont Solar Engineering

802.863.1202
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Re: [RE-wrenches] Large current battery combiners, UL Listing

[Jerry Shafer via RE-wrenches]

Wrenches
We have used the midnight box, both with and without OCP breakers, I dont
think they are large enough for what you want,  we have up to 80 kWhrs
connected going to 5 Radians.
Fun times

On Thu, Sep 8, 2022, 8:47 PM Mac Lewis via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> 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*
> ___
> List sponsored by Redwood Alliance
>
> Pay optional member dues here: http://re-wrenches.org
>
> List Address: RE-wrenches@lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> There are two list archives for searching. When one doesn't work, try the
> other:
> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>
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Re: [RE-wrenches] Large current battery combiners, UL Listing

[William Miller via RE-wrenches]

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

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
.
You might fabricate something that looks like one of these

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

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-boun...@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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Re: [RE-wrenches] Sol-Ark phase imbalances

[Jerry Shafer via RE-wrenches]

Wrenches
The 15 is not that similar to the 12, there is no OCP on most of the AC
inputs, this means you need to add that in, connection to the grid will
require a OPD maybe a traditional AC disco we used for years, you may need
a 200 amp with fuses as required by your meter max. Off grid you would not
need this but use of a genny would over 12 k or so you still do. Load out
of balance has gotten better with firmware upgrades. Over 2 battery inputs
will require a battery combiner, l have had no issues with solark on off
grid usage. Fortress battery links up well with the solarks.
Fun times

On Sat, Sep 10, 2022, 11:57 AM Howie Michaelson via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Is there a white paper or a thorough explanation of the issue Sol-Ark had
> with large imbalances between phases. I am looking at a large residential
> off-grid system using potentially (2)15 kw Sol-Arks. What are the concerns
> specifically around unbalanced inductive loads.
> Also, I have not installed multiple Sol-Arks before. Any suggestions or
> issues it would be good to be aware of?
> Thanks,
> Howie
> Sun Catcher
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Re: [RE-wrenches] Sol-Ark phase imbalances

[jay via RE-wrenches]

Hi Howie

Here is an interesting youtube video about testing the sol ark vs XW pro.

They use all sorts of loads and the sol ark does not come out well in my view, 
but I’ll let you decide. 

https://www.youtube.com/watch?v=-Ez4cbuy7IQ 




jay



> On Sep 10, 2022, at 12:57 PM, Howie Michaelson via RE-wrenches 
>  wrote:
> 
> Is there a white paper or a thorough explanation of the issue Sol-Ark had 
> with large imbalances between phases. I am looking at a large residential 
> off-grid system using potentially (2)15 kw Sol-Arks. What are the concerns 
> specifically around unbalanced inductive loads. 
> Also, I have not installed multiple Sol-Arks before. Any suggestions or 
> issues it would be good to be aware of?
> Thanks,
> Howie
> Sun Catcher
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[RE-wrenches] Sol-Ark phase imbalances

[Howie Michaelson via RE-wrenches]

Is there a white paper or a thorough explanation of the issue Sol-Ark had
with large imbalances between phases. I am looking at a large residential
off-grid system using potentially (2)15 kw Sol-Arks. What are the concerns
specifically around unbalanced inductive loads.
Also, I have not installed multiple Sol-Arks before. Any suggestions or
issues it would be good to be aware of?
Thanks,
Howie
Sun Catcher
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Re: [RE-wrenches] sol ark 12kw question

[Mac Lewis via RE-wrenches]

Hi Jay,

It can process 6500W of solar per input port of the MPPT, in the case of
the 12kW, there are 2 of them. so around 13kW.  As an off-grid inverter,
it's a 9kW total if perfectly balanced, but perhaps better to think of as
37.5A per phase.

I don't believe that 37.5A increases if the solar is available or not with
the 12kW.  However, in the new 15kW, there is a little bump in the off-grid
inverter output when there is solar available.

Cheers

On Sat, Sep 10, 2022 at 11:15 AM jay via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> HI All
>
> I”m trying to figure out exactly how much PV/CC there is for off grid on
> the sol ark 12kw or 9kw off grid
>
>
> The manual says 6,500 and 6,500 watts but that is grid connected.
> It looks like its 6,500 max for offgrid?
>
> Is that correct?
>
> thanks in advance
> jay
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-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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[RE-wrenches] sol ark 12kw question

[jay via RE-wrenches]

HI All

I”m trying to figure out exactly how much PV/CC there is for off grid on the 
sol ark 12kw or 9kw off grid


The manual says 6,500 and 6,500 watts but that is grid connected.  
It looks like its 6,500 max for offgrid?

Is that correct?

thanks in advance 
jay
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