Inverters for GT with Batteries [RE-wrenches]

Bill Roush solarguide at everestkc.net
Wed Sep 10 08:15:13 PDT 2003


Has anyone used the Millennium Panels (which I am still hunting specs
on) and a 48 volt inverter? I have a customer with some Millenniums who
wants grid tie and battery backup. 

Best,
Bill Roush
Solar Electric Systems/KC, Inc.


-----Original Message-----
From: Darryl Thayer [mailto:daryl_solar at yahoo.com] 
Sent: Tuesday, September 09, 2003 9:16 PM
To: RE-wrenches at topica.com
Subject: RE: Inverters for GT with Batteries [RE-wrenches]

Hi
I think the next good inverter will be the Outback
Grid tie. 
The panels or arrays do not have to be 48 volt, I have
been so happy with the way that the MX 60 performs, I
use up to 120 volts OC from the panels into a MX60
which then charges 48-volt systems. (most of my work
is stand-alone but the grid tie is increasing). 

I prefer 48-volt battery sets, where I am not working
with such high currents.  For stand-alone systems
where the batteries are cycled, I prefer
Lead-Antimony, such as Surrette.  But if the batteries
are for a grid tie system, where they just sit there
most of the time, in a float condition, as my grid
ties seem to do, I like a Lead-Calcium such as the
C&D.  If the batteries must be inside the house, I
prefer the sealed stacks from C&D, which I am now
buying a set as they are on sale.  The Lead-Calcium is
better in that it produces a lot less hydrogen and
uses a lot less water than Lead-Antimony.  

Bye the way I do not like parallel sets of batteries,
having seen two fires caused by batteries in parallel.
 My limit is two in parallel,  and I prefer one
string.  No parallel.       

Hope this helps Darryl
    
--- Graham Owen <graham at solarexpert.com> wrote:
> Allan,
> 
> I have roof mounts installed (during re-roofing) on

> four homes in So
> Cal, most of which were done well over a year ago. 
> I am also waiting
> and seeking reliable battery based grid-tie
> inverters.  One of these
> customers goal is "to be prepared for a terrible
> emergency and prolonged
> loss of grid power".  I explain to these customers
> that grid-tied and
> stand alone solar power are sound technologies, but
> combining both is
> not reliable and efficient, yet.  I have been
> considering installing 48
> V arrays with the new STXR's to get the rebate money
> flowing and later
> swap out the inverter for battery-based units, which
> I believe will most
> likely be low voltage.(?)
> 
> BTW, the CEC recently moved an additional $30 mil
> into the Emerging
> Renewables Program account, should keep new
> reservations going at least
> until next March.
> 
> Good luck,
> 
> Graham
> 

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