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31 May 2010

AC current (watts)
AC current, one day (5 min average)

There's an old truism that says "if you can't measure something then you can't fix it." This applies especially well to an off-grid renewable energy installation not only because there are so many components that have to be working in order for the whole system to work, but because the fail-state for many key components may not be immediately obvious UNLESS you're keeping a record of their performance over time.

31 May 2010

I happen to live off the grid. I don't mean this in a tinfoil-hat, leave-no-data-trail, They-are-going-to-get-me kind of way. I mean it in a "the-electrical-grid-owned-by-PG&E-ends-two-miles-away-from-my-house" kind of way. This means that I've had to learn a lot about electricity, and energy conservation, and renewable energy, and balance of system, and much more since I moved here five years ago.