Inverter/Battery Question [RE-wrenches]

[Darryl Thayer]

The rate of discharge should not have damaged the
batteries, however to go that far flat and having to
waite to recharge was probibly the culprit.  When
batteries get that flat the plate material starts to
desolve and should have been recharged as quickly to
above 1.85 volts per cell.  I guess it does not matter
who's cells they are never discharge them this far.  
Darryl

--- "John Blittersdorf, Cent. VT Solar & Wind"
<cvsolar at aol.com> wrote:
  
> 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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