EQ guidelines [RE-wrenches]

[graham at solarexpert.com]

Wrenches,

While we are on the subject of batteries I have another question.  How 
long is a battery bank specifically used for “grid-connected back-up” 
power going to last?  I had assumed that because these batteries are not 
cycled daily that they would last about 7 years.  I have recently been 
informed that these batteries receive a constant “ripple cycle" from the 
grid-connected inverter and at most the batteries will last for 3 years. 
 I think it is very important issue that installers (with mandatory full 
5 year warranties in California) need to know.

I am wondering if this 3-year expectation is correct and if so I am glad 
that I have only been installing straight net-metering systems for grid 
connected applications.  Many people called last year during the rolling 
blackouts seeking information about solar backup power systems.  My 
advice then was to purchase an APC system, remove the cover and connect 
more batteries.  I still direct some callers to 
www.apc.com/products/back-ups/index.cfm

Graham Owen
GO Solar

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