256
Logo

Watson Solar House Graphs

Solar cells on our
house
Click for more images

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. 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 Oct 4 20:22:47 2024 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   
Prev
Period


Prev
Half
Period
solar graph Next
Period


Next
Half
Period

You can also download the data associated with this graph.

Free Spam Protection   Android ORM   Simple Java Zip   JMX using HTTP   Great Eggnog Recipe