[RE-wrenches] Off-Grid Sizing Case

[Windsun@wind-sun.com]

Off-Grid Sizing CaseI would go with #1. The solar is obviously undersized for the battery bank he has. Another panel + MPPT should give him about 25-40% more, depending on temps etc.

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Northern Arizona Wind & Sun - Electricity From The Sun Since 1979
Solar Discussion Forum: http://www.wind-sun.com/ForumVB/
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  ----- Original Message ----- 
  From: Mark Frye 
  To: 'RE-wrenches' 
  Sent: Thursday, December 03, 2009 10:22 AM
  Subject: [RE-wrenches] Off-Grid Sizing Case


  Folks, 

  I have a customer with a 3 year old system  in northern CA: 

  8 - Deka 370AH, 6V, 2x4 banks - 740Ah @ 24V 
  2 - DR2424 120/240V series 
  4 - EC-120-GL 
  1 - C40 CC 
  1 - 5000W, old portable gas gen 

  The problem is increased gen runtime probally due to chronic undercharging. 

  Based on estimated consumption in the home, I think he needs about 2X the PV to meet the energy production needs in the summer (5 kWH/day)(30% DOD/day). But in order to get C10 charging during the summer he would need 5X the PV?

  Money is and issue. So what should I recommend: 

  1 - Increase PV 4X to 5X, add MPPT controller to get to a PV based system with gen support 
  2 - Get a 3K to 5K propane gen and and run as a gen based system with PV support 
  3 -? 
    
  Mark Frye 
  Berkeley Solar Electric Systems 
  303 Redbud Way 
  Nevada City,  CA 95959 
  (530) 401-8024 
  www.berkeleysolar.com  



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