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Old 07-07-2013, 06:33 PM   #37 (permalink)
MPaulHolmes
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Join Date: Feb 2008
Location: Maricopa, AZ (sort of. Actually outside of town)
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Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000
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Hurray it works! It was a super cloudy day... The sun kept getting almost poking through, and then not at all, but I never did see my shadow! But an interesting time to try out the MPPT!!! Here are some graphs. The most interersting thing I found was, the power DIFFERENCE was almost constant between power in and power out. So, the efficiency goes up the brighter the sun is. At least that's what appears to be true at the moment. The x axis is seconds, y axis is whatever the label says! haha. The clouds were racing by, so the cloudiness changed significantly every 0.5 seconds or so.

battery current and solar current:

Battery and solar voltage:

Battery power and solar power. Note: the batteries were receiving more power than was coming out of the panels! LOL. Just kidding. No need to move me to the unicorn corral...:


Power difference:


Efficiency. The efficiency went up as the sun would almost poke through. It peaked at around 90% when the sun was getting through almost. Then went back to stinking it up when the sun disappeared completely:
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Last edited by MPaulHolmes; 07-07-2013 at 07:01 PM..
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