Weekend Logging

Hi Reader,

This is not a news post, just some graphs from a testing setup over the weekend.  I connected a meter running the latest firmware () to a solar panel and left it by the window logging voltage and internal temperature once per minute.  Here’s the setup:


Here’s the data:

Since there’s no load on the solar panel except the meter, it reaches its open circuit voltage with very little light (sunrise is about 5:50am these days, but the panel would reach full output voltage by about 5am).  The window was an eastern exposure so the panel was in direct sunlight for the first part of the day, then indirect for the second half.  I made the mistake of leaving the meter where it would end up in direct sunlight – this caused the temperature in the meter to spike up to about 115*F(46*C).

The original logfile is here for those interested. Here is the version that I reformatted for graphing in Excel.

Thanks for reading


2 Responses to “Weekend Logging”

  1. Kathy June 29, 2016 at 1:08 pm #

    Looks great.

  2. jonatha July 10, 2016 at 1:36 pm #

    Hello James, how to use the Math function? I measure current using a shunt, thus use Aux DC.
    I want to be able to disable amps directly by using math function to take Aux DC and devide by shunt resistance.

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