Re: [RE-wrenches] Dual battery bank switch for 48 VDC system

2024-06-15 Thread Kirk Herander via RE-wrenches 
Eaton Double Throw 100 Amp Generator Transfer Switch DT223URK-NPS
rated @ 250 vdc, 100 amp, non-fusible

On Sat, Jun 15, 2024 at 1:19 PM greg egan via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Wrenches,  I have a customer who has a 2 strings of AGM's @ 48 VDC that
> we want to split so we can charge them at decent charge rate. Adding
> more PV and/or larger generator and inverter is cost prohibitive.  I've
> seen Blue Seas (#3002) 4 position 500 amp switches that are rated for
> 32VDC.  Max he could possibly pull at once with his system is less than
> 100 amps.
>
> I would assume the Blue Seas 3002 would work and I'd probably use it in
> my garage, but I'm not comfortable recommending it to a customer.  Any
> suggestions on a 60 VDC rated unit that could handle say 150 amps and
> 4/0 cables?
>
> Maybe I'm being too cautious since the max load would be < 6KW and the
> 3002 is rated for 16kW load (32 VDC /500A)?   Thoughts?
>
> Thank you,
>
> Greg Egan
> Remote Power Inc.
> Fairbanks, AK
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*Kirk Herander / **kirkh@vermont.solar *

*Owner|Principal, VT Solar, LLC*

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dba Vermont Solar Engineering

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Re: [RE-wrenches] Dual battery bank switch for 48 VDC system

2024-06-15 Thread greg egan via RE-wrenches 
Jay, the Blue Seas 3002 states it's "make before break" So I'm assuming 
the lights don't go out when you make the switch.  Anyway, thanks for 
the Midnite option.  I'll take a look,


Greg



On 6/15/2024 9:49 AM, Jay wrote:

Hi Greg

How about this midnite box
midnitesolar.com 








Personally what I don’t like about single switch A or B is there is an 
off time.


With the midnite box, you switch both on, and turn the off the one you 
want. That way there is never an off time.


Just a thought.

Jay

On Jun 15, 2024, at 11:19 AM, greg egan via RE-wrenches 
 wrote:


Wrenches,  I have a customer who has a 2 strings of AGM's @ 48 VDC 
that we want to split so we can charge them at decent charge rate. 
Adding more PV and/or larger generator and inverter is cost 
prohibitive.  I've seen Blue Seas (#3002) 4 position 500 amp switches 
that are rated for 32VDC.  Max he could possibly pull at once with 
his system is less than 100 amps.


I would assume the Blue Seas 3002 would work and I'd probably use it 
in my garage, but I'm not comfortable recommending it to a customer.  
Any suggestions on a 60 VDC rated unit that could handle say 150 amps 
and 4/0 cables?


Maybe I'm being too cautious since the max load would be < 6KW and 
the 3002 is rated for 16kW load (32 VDC /500A)?   Thoughts?


Thank you,

Greg Egan
Remote Power Inc.
Fairbanks, AK
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Re: [RE-wrenches] Dual battery bank switch for 48 VDC system

2024-06-15 Thread Dave Angelini Offgrid Solar via RE-wrenches 
Good Luck !   I look every year and there are never any rated this high. 
A few knock-off cheap ones but???


I have used the Blue Seas and one other with this app. If you are 
careful about switching under big loads/EQV's it will last.


If this is an insured home, you have to disclose this or be Lawyer 
fodder in a fire. Even then I would let the client buy it.


The other way around is to use 250A rated Midnite or Schneider inverter 
breakers. It is clunky as you have to know what you are doing when using 
it. You could easily turn both off and lose power. The 4 position Blue 
Seas takes that out and is much easier to

understand.

I did the 250s a few times and it worked well, is not inexpensive, and 
was legal for Home Insurance.


Dave Angelini Offgrid Solar
"we go where powerlines don't"
   [1]https://offgridsolar1.com/ [2]  [1]
e-mail  offgridso...@sti.net
text 209 813 0060

On 2024-06-15 10:18 am, greg egan via RE-wrenches wrote:

Wrenches,  I have a customer who has a 2 strings of AGM's @ 48 VDC that 
we want to split so we can charge them at decent charge rate. Adding 
more PV and/or larger generator and inverter is cost prohibitive.  I've 
seen Blue Seas (#3002) 4 position 500 amp switches that are rated for 
32VDC.  Max he could possibly pull at once with his system is less than 
100 amps.


I would assume the Blue Seas 3002 would work and I'd probably use it in 
my garage, but I'm not comfortable recommending it to a customer.  Any 
suggestions on a 60 VDC rated unit that could handle say 150 amps and 
4/0 cables?


Maybe I'm being too cautious since the max load would be < 6KW and the 
3002 is rated for 16kW load (32 VDC /500A)?   Thoughts?


Thank you,

Greg Egan
Remote Power Inc.
Fairbanks, AK
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Links:
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[2] https://offgridsolar1.com/___
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Re: [RE-wrenches] Dual battery bank switch for 48 VDC system

2024-06-15 Thread Jay via RE-wrenches 
Hi GregHow about this midnite box midnitesolar.comPersonally what I don’t like about single switch A or B is there is an off time. With the midnite box, you switch both on, and turn the off the one you want. That way there is never an off time. Just a thought. JayOn Jun 15, 2024, at 11:19 AM, greg egan via RE-wrenches  wrote:Wrenches,  I have a customer who has a 2 strings of AGM's @ 48 VDC that we want to split so we can charge them at decent charge rate. Adding more PV and/or larger generator and inverter is cost prohibitive.  I've seen Blue Seas (#3002) 4 position 500 amp switches that are rated for 32VDC.  Max he could possibly pull at once with his system is less than 100 amps.I would assume the Blue Seas 3002 would work and I'd probably use it in my garage, but I'm not comfortable recommending it to a customer.  Any suggestions on a 60 VDC rated unit that could handle say 150 amps and 4/0 cables?Maybe I'm being too cautious since the max load would be < 6KW and the 3002 is rated for 16kW load (32 VDC /500A)?   Thoughts?Thank you,Greg EganRemote Power Inc.Fairbanks, AK___List sponsored by Redwood AlliancePay optional member dues here: http://re-wrenches.orgList Address: RE-wrenches@lists.re-wrenches.orgChange listserver email address & settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.orgThere 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.orgList rules & etiquette:http://www.re-wrenches.org/etiquette.htmCheck out or update participant bios:http://www.members.re-wrenches.org___
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[RE-wrenches] Dual battery bank switch for 48 VDC system

2024-06-15 Thread greg egan via RE-wrenches 
Wrenches,  I have a customer who has a 2 strings of AGM's @ 48 VDC that 
we want to split so we can charge them at decent charge rate. Adding 
more PV and/or larger generator and inverter is cost prohibitive.  I've 
seen Blue Seas (#3002) 4 position 500 amp switches that are rated for 
32VDC.  Max he could possibly pull at once with his system is less than 
100 amps.


I would assume the Blue Seas 3002 would work and I'd probably use it in 
my garage, but I'm not comfortable recommending it to a customer.  Any 
suggestions on a 60 VDC rated unit that could handle say 150 amps and 
4/0 cables?


Maybe I'm being too cautious since the max load would be < 6KW and the 
3002 is rated for 16kW load (32 VDC /500A)?   Thoughts?


Thank you,

Greg Egan
Remote Power Inc.
Fairbanks, AK
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