Xantrex versus Sunny Boy [RE-wrenches]

[Bill Brooks]

Jeff,

How are you measuring this 6% loss? I think that is excessive if the proper
efficient transformer is used. If you are measuring volt-amps, that is not
an accurate assessment of energy lost. Certainly there is heating of
conductors because of the current flow, but this the main real power loss.
Contrary to Kent's post, most customers do not pay for VARS unless they have
a really bad power factor that the utility is penalizing them for. I think
you either have the wrong transformer, or you are not calculating your
energy loss properly.

Bill.

-----Original Message-----
From: Jeff Oldham [mailto:starpower4u at juno.com]
Sent: Friday, August 01, 2003 3:32 PM
To: RE-wrenches at topica.com
Subject: Re: Xantrex versus Sunny Boy [RE-wrenches]



I've been 'round and 'round w/this. I've installed 3 PV20's (1 project 2
different roof planes) and seen 24/7 transformer loss at 6% of total
production. I'm currently working on 2 very lg. residential systems a 96kW
and a 98kW (not a typo!)one is 3 phase so there are choices but the other is
240 single with no reasonable hope for a 3 phase inverter. For both systems
and many hours of calcs. 33 and 34 SB's are winning out. I agree w/Bill the
reliabilty is about equal on both PV series and SB but disagree on drawing
the line at 10 - 20kW. I used to be right there until I saw my trans. losses
and brand X giving me as many problems.

Ballard (yep the fuel cell people)is coming along with some interesting
inverters including a 30kW for that HI project. All of their designs have 10
circuit internal combiners and a night time disconnect of the transformer!

Any wrenches coming to Solfest look me up, I'd like to meet you!

-jeff o


>From the Solar, Wind and Hydro powered office of Jeff Oldham

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