(SPAM*) Xantrex versus Sunny Boy [RE-wrenches]

[David Blittersdorf]

Marco,

My company is in the construction phase of a 65kw PV system for our new 
manufacturing building.  After 2 years of researching the PV and inverter 
options, we are going with the Sunnyboy over the older Trace Tech. 
inverters. I originally thought one big inverter would be better but the high 
DC voltage strings and multiple Sunnyboy's will offer a more reliable and 
efficient system.

I have direct experience with the Trace Tech. 10kw inverter used on the 
Bergey 10kw wind turbine. The wind inverter is a modified PV inverter. The 
IGBT technology and electronics used  has very high losses at less than full 
load. Also the need for an isolation transformer is a waste of energy. You 
will probably lose 1-3% of max output in the transformer. 

Use 12 Sunnyboy 208vac single phase inverters. The MPPT will work 
better, if an inverter fails the whole system does not fail and you get to wire 
both the DC and AC sides with much smaller wire.

Regards,

David Blittersdorf

On 30 Jul 2003 at 11:58, Marco wrote:
> I'm getting differing opinions on a design question that's leaving me in a > 
bit of a quandry.  I'm pursuing a 30 kW DC grid-tied system sale to the > 
local healthfood store here in Hilo, ~19 degrees north lattitude.  There's > 3-
phase 120/208 service at the store, so I'd like to use a single Xantrex > 
PV30208 inverter (and isolation transformer).  Since there's not enough roof 
> space on the due south face for all 30 kW, the array would be split roughly 
> equally among the southern, eastern and western faces of the roof.  Each 
series > string of (12) 24V modules would be on one plane, i.e., no series 
string would > span two roof faces.  Now, I know very well that splitting this 
system onto > three planes is not ideal when using a single inverter. 
However, I'd much prefer > to use one inverter rather than (12) 3-phase 
SB2500s.  Nor do I want to use > three 10-kW PV10208 inverters--one 
each per roof face.  So, my question to my > esteemed PV wizards is, how 
poorly or sub-optimally do you think such a system > will perform?  Any of 
you out there who have installed similar multi-plane, > single-inverter 
systems? > > tanks, > aloha, > marco > > Marco Mangelsdorf > President > 
ProVision Technologies, Inc. > 69 Railroad Avenue, Suite A-7 > Hilo, Hawaii 
96720 USA > (808) 969-3281, fax 934-7462 > 
www.provisiontechnologies.com >  
David Blittersdorf
NRG Systems, Inc.
110 Commerce Street
Hinesburg, VT 05461 USA
Tel: 802-482-2255
Fax: 802-482-2272
email: davidb at nrgsystems.com
Web:http://www.nrgsystems.com

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