Voltage drop musings [RE-wrenches]

[hugh piggott]

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Hi

At 2:36 am -0700 22/5/01, William Miller wrote:
>In disagreement with the philosophy of designing for average operation is
>the scenario of the homesteader with low batteries on the first clear
>winter day.  They don't care what the average system operating parameters
>are, they just want the maximum power delivered to their batteries before
>the sun goes down.  If we saved a few bucks on buy wire too small, we may
>have been doing them a disservice.

I may be very confused here, but I thought the module voltage was 
(could be) high on clear days. (Of course the actual module voltage 
will depend on battery voltage and cable drop.) The battery voltage 
will be low if the batteries are low.  So there is a big difference 
between module's potential  output voltage and battery input voltage, 
which you can use for volt drop in the cables without altering the 
current.

I would envisage a problem arising when the battery voltage is high 
and the modules are hot, which could prevent them producing enough 
volts to do the battery plus cable losses.

Put me right.
-- 
Hugh

Scoraig, in Scotland.
http://www.scoraigwind.co.uk

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