[RE-wrenches] Low voltage DC v. higher voltage DC

Tue Sep 25 19:48:10 EDT 2018

Outback said at SPI today they have shipped more than a dozen. The
Schneider mppt-80-600 starts at 180vdc BTW. 
Dave Angelini Offgrid
Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
[1]
e-mail offgridsolar at sti.net [2]
text 209 813 0060

On Tue, 25 Sep 2018
16:38:13 -0700, Bradley Bassett  wrote:   A more recent spec sheet shows
the MPPT window starting at 200v instead of 250v, which is a significant
improvement.   Brad  
  On Tue, Sep 25, 2018 at 2:41 PM Dave Angelini
Offgrid Solar  wrote: AEE had a training course webinar. The screenshot is
from them and they
 say October...

 On Tue, 25 Sep 2018 11:49:10 -0700,
Jay  wrote:
 > Hi all
 > 
 > What is the news on the skybox? 
 > 
 > Last I
checked it was still MIA
 > 
 > Jay
 > 
 > 
 > 
 >> On Sep 25, 2018, at
9:13 AM, Jeff Clearwater
 >>  wrote:
 >> 
 >> Hi Dave and All. 
 >> 
 >>
Reasons for HV batteries off grid? 
 >> 
 >> 1) Smaller cable size (I just
did an 18 Kw off grid with 4 SIs and the
 >> cable costs alone were in the
order of $400) and increased flexibility
 >> locating batteries and
inverter. 10 AWG plug and play.
 >> 
 >> 2) Higher efficiencies. Easy
integration on the DC bus.
 >> 
 >> 3) Integration with GTBB battery tech
and systems. Why have two
 >> standards and two sets of equipment? The line
between Off Grid and
 GTBB
 >> will blur as more GT customers want more
storage and more Off-grid
 >> customers want the option of grid hookup at
some point. For
 developing
 >> countries as off grid micro grids grow they
can merge.
 >> 
 >> 4). Integration with Electric Vehicles as storage for
either GTBB or
 >> Off-Grid - can integrate on the DC bus seamlessly.
 >> 

>> These are the reasons that seem obvious to me. I'd be surprised if the

>> manufacturers are not thinking this way. Though you may be right as I

was
 >> surprised that Outback went 48V with the Skybox. And it's been a
hard
 >> sell to get SMA to support US off-grid. If the equipment could do
both
 >> seamlessly they would have more market.
 >> 
 >> And High Voltage
safety is not really an issue with proper (standard
 >> electrician)
training and as the only electrician or customer interface
 >> is a plug or
set of small non-energized terminals. Having high voltage
 DC
 >> in you
car is more dangerous. House fires are caused by amperage leaks
 >> (much
higher in Low V) (and shorted PB-acid) way more than voltage
 leaks.
 >>

>> 
 >> I'm off to SPI. I'll ask them . . From what I understand Pika is

heading
 >> that direction. I imagine Powerwall too if they ever decide to
support
 >> off-grid.
 >> 
 >> Best
 >> 
 >> Jeff
 >> 
 >> 
 >> 
 >> 
 >> 

>> 
 >> 
 >> 
 >> 
 >> 
 >> 
 >> 
 >> 
 >
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 -- 
 Dave Angelini Offgrid Solar
 "we go
where powerlines don't"
 http://members.sti.net/offgridsolar/ [11]
 e-mail
offgridsolar at sti.net [12]
 text 209 813
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