Batteryless inverter recommendation [RE-wrenches]

[Joel Davidson]

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Hi Chris,

Which inverter meters are way off?

I have 20 Siemens SP75 modules feeding into an SB2100U inverter and a GE I70 
kWh meter. From September 20, 2007 to February 22, 2008 the SB2100U measured 
740.2 kWh and the GE I70 measured 736 kWh. (PVWATTS estimates 748 kWh at 81% 
DC-to-AC derate.) Looks good to me.

Back to inverter recommendations. Wrenches like both SMA and Fronius 
inverters. What about initial installation and call-back costs? Is it worth 
it to pay more for a 3kW Sunny Boy inverter than a 3kW Fronius?

Joel Davidson

----- Original Message ----- 
From: "Christopher Freitas --- OutBack Power"
To: <RE-wrenches at topica.com>
Sent: Tuesday, February 26, 2008 2:49 PM
Subject: RE: Batteryless inverter recommendation [RE-wrenches]


>
> Michael -
>
> Isn't the Fat Spaniel system doing the monitoring using the watts meters
> built into each of the inverters?  If so, then the results are dependent
> on the accuracy of those meters - right?
>
> I've seen more than a few battery-less grid-tie inverters with
> "optimistic" metering system displays in them...
>
> Or does this system have additional watt-meter sensors for each of the
> inverters?
>
>> See the real world comparisons:
>> http://view2.fatspaniel.net/FST/Portal/AEE/kiosk/index.html
>
>
> Christopher
>
> Christopher Freitas
> OutBack Power Systems, Inc.


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