[Greenbuilding] Amorphous Silicone 32 Watt modules??

[Lawrence Lile]

Why would two 64 watt modules in series burn out the pump, when two 42
watt modules won't?  If the pump can operate at 24 volts, then it will
not draw excessive current unless the voltage goes up.  The excess
capacity of the module is simply not used.  

For example, a battery can deliver enough power to arc weld (I've done
this), but two car batteries in series would not burn out a 24 volt
rated pump.  

--Lawrence Lile




-----Original Message-----
From: greenbuilding-bounces at listserv.repp.org
[mailto:greenbuilding-bounces at listserv.repp.org] On Behalf Of
wmdorsett at sbcglobal.net
Sent: Wednesday, September 06, 2006 8:28 AM
To: Green Building
Subject: [Greenbuilding] Amorphous Silicone 32 Watt modules??

    A local rancher wants to pump water from about 80ft with a diaphragm
pump. It can be done inefficiently with a 12 volt module but would be
better with a 24 volt weries.  Standard crystaline modules loose voltage
whith heat, and we need water when the sun is hottest so I would like to
go with amorphous modules. Unisolar has quit making 32 and 42 watt
modules so the only way to get 24 volts is to series two of their 64
watt modules. This will burn out the pump.

   Does anyone have a quantity of old stock  (not used) 32 or 42 watt
Unisolar modules? Alternatively does anyone know of comparable modules
from another manufacturer?


Thanks for your help

Bill Dorsett
Sunwrights PV
Manhattan, KS
_______________________________________________
Greenbuilding email list
List info:
http://listserv.repp.org/mailman/listinfo/greenbuilding_listserv.repp.or
g
List email: Greenbuilding at listserv.repp.org Managed by BuildingGreen,
Inc. http://www.buildinggreen.com
      publisher of Environmental Building News and GreenSpec(r) Hosted
and archived by REPP / CREST http://www.crest.org