PV power tolerance [RE-wrenches]

[Graham Owen]

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Hi Dan,

Peak PV inverter efficiencies from various manufacturers run in the low
to mid 90% range for inverter loads between 30% and 100%.  But this is
not the entire picture of inverter efficiency.  There is an overall
inverter efficiency which is calculated as the average inverter output /
average PV output; overall inverter efficiency varies over time from a
high of around 76% to, of course, a low of near zero (night-time).  This
web site research from a University in Glasgow, England, may be of
interest; 4-pages in length:

http://www.esru.strath.ac.uk/EandE/Web_sites/98-9/grid_connected_pv/s_op
tim.htm

Note the suggestion that undersizing inverters as well as multiple
inverters may be the most economical approach when designing PV systems.

Best regards,
Graham

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