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Watson Solar House Graphs

Solar cells on our house
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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.

Wed Jul 23 06:40:17 2014 Latest:
Inverter output: total separate
DC Amps    DC Volts    Grid Freq Hz    Grid Volts AC    Kilowatts/Day    Operating Hours    Operating Hrs/Day    Temp of Unit F    Total Kilowatts    Watts   
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You can also download the data associated with this graph.

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