PV power tolerance [RE-wrenches]

[Hugh Piggott]

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>Oh, a Scot would so disagree. I was in Glasgow for a wee bit in the 
>Spring, and it's a fair ways north of the border. I almost went to 
>Hugh Piggott's place

I am not totally impressed by grid connected PV in Scotland myself. 
It makes  good back up for stand alone wind power but we only get 
about 20 - 50% of the sun you guys get in the states.  Switzerland 
seems to have a lot of sun too if I believe the map.

As for efficiency I do believe it could do with some scrutiny.  Grid 
connected systems should be better for having MPPT inverters.  Surely 
someone has figures for Sunny boy, Outback and brand X.  Evidence 
suggests the SW is about 75% with battery losses  and that seems to 
agree with the figures in the paper referred to.  But -  that is 
after the temperature effects, PV voltage mismatch and wiring etc.

A lot of off-grid systems seem to lose a lot to the controller 
(regulating).  If the system is sized to be reliable over a period of 
time then it will be regulating a lot of the time under normal 
conditions.  And if the owners are away at work in the city over a 
day tor two, then the efficiency is effectively zero a that time.
-- 
Hugh
Scoraig Wind Electric
http://www.scoraigwind.co.uk/

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