[RE-wrenches] Cummins DC generator

[bob ellison]

I downloaded the spec sheets on the DC generator, it's either LP or natural
gas. Also it's regulated to 26 volts or 52 volts, so it's about useless to
charge batteries in an off grid system, unless you just need to feed power
to the battery bank.

Bob Ellison

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Ray Walters
Sent: Friday, October 21, 2011 7:41 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Three-phase off-grid

 

HI Allan;

I haven't tried the large Exeltech inverters, but I could see some
advantages to having a separate charging system, and keeping the inverters
supplying stable power. Everytime a generator coughs or switches from one
source to another, it seems to cause trouble. The generator could be sized
smaller, since it wouldn't need any surge capability. It would always run
the same charger, and the inverters would always run the same loads. I'd at
least take another look at it for my next large project, but cost might be a
limiting factor.
Here's a Cummins diesel DC generator, just to think about:
http://www.cumminspowerproducts.com/DCgensets/Other/10000500.pdf

Ray

On 10/21/2011 4:56 PM, Gary Willett wrote: 

Alan: Thanks for setting me straight about 3-phasing the Outback Radian - I
was not aware they are limited to parallel single phase applications.

Regards,

Gary Willett


On 10/21/2011 15:29, Allan Sindelar wrote: 

Gary,
I was surprised by this information, as I had presumed that both units were
for single-phase only. So I checked.

Mary Raub in tech support at Outback told me that the Radian works only in
120/240 single-phase, although they are stackable in parallel.

Someone in Schneider tech support told me that the XW can be used in
three-phase, up to six units (36 kW). Setup instructions are in Appendix D
of the XW installation guide, found online at
http://www.global-download.schneider-electric.com/85257849002EB8CB/all/5CC68
9CC3CB7FD10852578BF005EA759/$File/xw-hybrid-inverter-charger_installation-gu
ide%28975-0239-01-01_rev-e%29.pdf.

Thanks, Allan
 

Allan Sindelar
 <mailto:Allan at positiveenergysolar.com> Allan at positiveenergysolar.com
NABCEP Certified Photovoltaic Installer
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Positive Energy, Inc.
3201 Calle Marie
Santa Fe, New Mexico 87507
505 424-1112
www.positiveenergysolar.com <http://www.positiveenergysolar.com/>  


On 10/21/2011 2:01 PM, Gary Willett wrote: 

Allan:
Also, you might consider using six to nine Schneider/Xantrex XW6048
inverters, or  six to nine Outback Radian GS8048 inverters, in a 3-phase
configuration, with a common battery bank.
Also, Schneider/Xantrex has an 80A 600V charge controller that may be
advantageous depending on the distance from the PV arrays to the inverters.

Regards,
Gary Willett, PE
Icarus-Engineering LLC

Icarus Solar Services LLC


On 10/21/2011 10:17, Allan Sindelar wrote: 

Wrenches,
We have been asked for a design for an off-grid system to reduce generator
runtime for a mountain resort. Initial projections (consumption measurement
results not yet available) suggest 15-20 kW of PV and around 30 kW of
inverter capacity. However, the generators and existing wiring are
three-phase 120/208.

My assumption is that our only options are a set of six Sunny Islands, or
9-12 Outback GVFX3648s. Are there any other options or approaches that I'm
missing?

Thank you, Allan

-- 
Allan Sindelar
 <mailto:Allan at positiveenergysolar.com> Allan at positiveenergysolar.com
NABCEP Certified Photovoltaic Installer
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Positive Energy, Inc.
3201 Calle Marie
Santa Fe, New Mexico 87507
505 424-1112
www.positiveenergysolar.com <http://www.positiveenergysolar.com/>  

 






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