Inverter/Battery Question [RE-wrenches]

[John Blittersdorf, Cent. VT Solar & Wind]

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In a message dated 1/18/2006 8:57:01 P.M. Eastern Standard Time,  
allan at positiveenergysolar.com writes:

That's a  C/1.26 discharge rate for a second or two, followed by a 110A load
for the  duration of the pump's runtime, or C/2 discharge rate for probably
10-15  minutes. I've never tried to do this. Before we invest in another
inverter,  I am asking for some guidance as to whether we can expect it to
work. Do we  have to add a second string of batterie


Allen,
    Last summer at SolarFest2005 in Vermont we had 4 VFX  3524s - powering 
the stage with peak consumption of 15kw with the average about  12kw. We had 32 
Trojan L16P's feeding the 4 inverters, each inverter having a  set of 4/0 
cables, 4/0 parallel jumpers and 2/0 series  jumpers.  I think we were drawing at 
about C2 or worse and we  destroyed that battery bank.  Most of the batteries 
exhibit lack of  capacity now, as if they are 8 to 10 years old and taking 
their last  breath. The inverters seems to take it all in stride even though the  
4/0 cables were getting quite warm.  Our test was short lived as we were  off 
grid with only 1.2kw of PV to recover  the batteries.  We  might have come 
out better if the batteries had been completely full and maybe  even cycled a 
few times before we did the big test.  I have no solution for  your problem but 
replace the pump or add the inverter and some more  batteries.
   
 
John  Blittersdorf
NABCEP Certified Solar PV Installer
Central Vermont Solar  & Wind, Inc.
104 River Street
Rutland, VT  05701

802-747-0577
802-773-0924 fax
802-770-8625 cell
_www.cvsolar.com_ (http://www.cvsolar.com/) 


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