Watson Solar House Graphs

The following graphs show the output from the solar panels on our house. We have 2 Sunny Boy 2500U inverters (#4 and #6) which convert the DC to AC power which are monitored via a serial connection. I wrote a monitoring script for them in perl which talks the protocol, sends commands, and interprets the responses. The data is loaded into a Postgres SQL database and the graph is drawn in realtime by the GD::Graph perl module. The company that buys my renewable energy credits also monitors my system output and has a graph on their Soltrex monitor site. Our panels face East-Southeast (estimated to be 20% less than optimal South) so you will see a conspicuous drop in system output in the late afternoon even though Boston is still getting a lot of sun -- just from the Southwest.

Fri May 9 16:49:47 2008 Latest:
Current from PV-panels    Energy Yield    Energy Yield Per Day    Grid Frequency    Grid Voltage    Operating Hours    Operating Hours Per Day    Power Fed to Grid    Temperature of Unit    Voltage from PV-panels   
Last 1 Month Last 1 Week Last 3 Days Last 1 Day Last 12 Hours Last 6 Hours Last 3 Hours Last 1 Hour Last 30 Minutes Last 10 Minutes

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You can also download the data associated with this graph.

Copyright 2005 Gray Watson.

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