I-V Curves [RE-wrenches]

[Graham Owen]

Wrenches,

I am trying to provide each of my PV customer’s comprehensive manuals, 
which include diagrams, component manuals and performance information.  
I am still unsure of the best way to trace and document I-V curves for 
each individual installation.  I have a Day Star meter, Several Fluke 
meters including an 867B graphical multimeter, AC/DC Amp Clamp and an 
infrared temperature gun.  I feel confident that I am able to make sure 
each system is working well and I can physically draw a graph on paper 
with Amps on one axis and Volts on the other, but what is the best way 
to correctly show the true slope curvature?  I want to be able to save 
this information accurately in a database as well as print it out for my 
customers.

I was just reading page 15 of the August/September Home Power magazine 
and it mentions using “an electronic DC load device”.  I need to get 
such a device but I am unsure what to purchase?   Matt Lafferty 
mentioned that his I-V Tracer cost about $17,000 but I would be better 
served investing a sum like that towards another work van.

I am still trying to learn as much as possible and it was only recently 
I became aware that the secret magic ingredient inside all electronic 
components is smoke.  And if I install the system correctly it will work 
great, but if I do something wrong and let the smoke out a component it 
will not work anymore.  I want to be sure that my testing of systems can 
never let the smoke escape.

Graham Owen
GO Solar

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