Jesse,
Are you sure that you even want to take this on?

20' wind tower, 500 watt (rated) machines, four battery strings in parallel - the design itself has enough weakness, based only on the scant information that you have provided, that it might not be a system with which you'd want to get involved.

Also, some confusion here - are the inverters FX3048T or GTFX3048? David has assumed the latter, asking about selling, but you are describing a utility-backup setup, rather than utility-interactive. Utility backup with only ineffective wind as the secondary source would indeed increase a utility bill, at least marginally.

It sounds as though the system could be performing exactly as designed.
Allan

Allan Sindelar
[email protected]
NABCEP Certified Photovoltaic Installer
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder and Chief Technology Officer
Positive Energy, Inc.
3209 Richards Lane (note new address)
Santa Fe, New Mexico 87507
505 424-1112
www.positiveenergysolar.com



On 8/24/2012 7:26 AM, Jesse Dahl wrote:
The system only uses grid power to charge batteries, they have two FX3048T in parallel so I don't think the meter is the issue.

They did send me a picture of the two wind towers, one is 20 feet off the ground and one is 60 feet off the ground... No wind would be an understatement. 



Sent from my iPhone

On Aug 24, 2012, at 7:43 AM, David Katz <[email protected]> wrote:

Check to see if their meter goes backwards.  Some utility meters actually charge for power when you are selling.
Or maybe they have no wind and a new big flat screen tv that they leave on all the time.
David Katz


----- Reply message -----
From: "Jesse Dahl" <[email protected]>
To: "Wrenches" <[email protected]>
Subject: [RE-wrenches] Outback with grid charging
Date: Thu, Aug 23, 2012 11:28 pm



Hello,

I got a call from a family today about a system they had installed recently and they think they have a problem.  They claim their electric bill has just about doubled since the system has been installed due to outback using the grid to power the loads instead of the battery bank.  They claim the MATE always shows the system buying the exact amount as any load on the system draws.   Due to the distance from my shop, I would like to get any ideas on what could cause this before I drive all the way there. 
 
What I know about the system:
2 - outback inverters, 48v
2 - whisper 500 wind generators with whisper charge controllers
16 - MK 12v AGMS (8/inverter)

I guessing setting, but if anyone has seen this before, I'd like to narrow it down before the drive. 

Thanks eh!

Jesse

Sent from my iPad!!!
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