[RE-wrenches] Advice needed on upsizing a battery & grid interactive inverter stack

[Darryl Thayer]

I have a functioning Outback system of 12 inverters, the original design was for 15 inverters. My system can sell up to 40 kW to the grid and I have seen pictures of systems up to 25 inverters.  How big a battery bank and how big a generator?  Realistically you may not want to charge over C/10    Have you considered a 48 volt generator?  

Daryl 

--- On Fri, 8/6/10, Mick Abraham <mick at abrahamsolar.com> wrote:

From: Mick Abraham <mick at abrahamsolar.com>
Subject: [RE-wrenches] Advice needed on upsizing a battery & grid interactive inverter stack
To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
Date: Friday, August 6, 2010, 6:17 PM

Yo, Mechanics~
A client is considering a "biggest ever for me" battery based power system. They will probably scale down their ambitions once the cost realities settle in but for now they've asked me to look for battery based inverter systems which can scale bigger than a triple stack of Xantrex XW6048 inverters. Your advice would be welcomed. 


* The system must be split phase 120/240, not 3 phase. 
* Outback seems "out" because the inverter group should handle backup battery recharge using grid or generator AC...and we also want to sell excess PV power to the grid.


* No cobbled together AC coupled systems would be considered without a convincing way to feather the end of charge on the battery when the grid is down...float & all. I don't want to go back to the days of clunky, coarse battery "end of charge" care. 


* Sunny Island/Sunny Boy is in contention but I'm not keen on having to stack in pairs to maintain the 120/240 three wire architecture. A single Sunny Island failure would take down two of the yellow boxes. What is the limit on stack-ability for Sunny Island?


* A battery sales rep suggested Satcon brand but I think that's bogus advice. Satcon is pure grid intertie only, right?
***********************************************


So...there is your challenge de la semaine (challenge of the week). Who builds an inverter system with Xantrex XW-like features only bigger...much bigger? OR: who could supply the "Mother of Sunny Island/Sunny Boy" system? Replies would be welcomed on the  List or off.


The Wrench List is the Bomb!
Mick Abraham, Proprietor
www.abrahamsolar.com

Voice: 970-731-4675



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