This is the index for www.mileson.com hosted on Amazon S3.

Scans of old Wegner and Jordahl albums. The scanning work was finished around Jan 29, 2006.

How much power the solar panel system generated over the past few days. Power generation is mostly a function of weather and solar geometry. The Solar Incidence Angle is the angle between a ray perpendicular to the plane of the solar panel and a ray pointing towards the center of the sun. A lower value indicates the sun is more directly centered in front the panel.

Artisan estimates the energy output of the system verses the month of the year. This estimate feeds into a spreadsheet used to compute the overall costs of the system after rebates, PSE payments, etc. Here's how we're doing so far. The purple line is the actual energy production, the dotted line is Artisan's prorated monthly estimate.

Throughout the year the system generates energy, more in the summer and less in the winter. You want the summer surplus to more or less balance out the winter deficit, breaking even over the course of a year. This plot shows total production, total usage, and current energy balance for the year.

Some days are better than others due to cloud cover and solar geometry. Here are the best and worst days so far.

Another way to look at daily variation is by plotting daily power benchmarks: sunrise/sunset, first and last generated power, first and last 1 kW power, and peak power.

Temperature measurements from various Wireless Tags

Solar Edge reports power every 15 minutes. This plot shows theoretical best, worst, and average days by analyzing this 15 minute data: