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Showing posts from April, 2021

Solar reflections

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Our solar has been installed and generating for a year now... and enphase is really good at making data available. So I've been looking at our solar data and playing some what if games. For these purposes I am taking our electicity data from the enphase monthly reports - which do not include our garage power usage due to the way the our house is wired, but that usage is quite trivial so I am going to ignore it. The enphase system reports data (power generated, power imported, power consumed and power exported) in 15 minute intervals. I've include all the data which means I've got a little over 13 months of data to work with. Keep in mind that we have a great big tree on the east side of our house that significantly shades our solar panels for most of the morning, and a decent tree on the west that provides some partial shade especially in the later afternoon. Overall summary - daily average by month (kWh). Month Produced Consumed Exported Imported Net Jan 16.0 ...

2021 March

Fall is here, but we just ticked out of the HRV's need to cool zone at the end of March. In March we ran the A/C on 4 days on a noon until 6pm schedule to take advantage of the solar production during that part of the day. The main source of cooling continues to be openning the windows during the cooler evening / nighttime hours, although towards the end of March we've not been doing much nighttime ventilation. THe HRV is working well and we done with the experimental period (I've sent the ERV core back to FanTech)! March is a "normal month" typically one adult is at work while the other is working from home, but we are increasingly spending days in the office. Percentage of hours in below, within, above the 20 - 25 °C target temperature range for the month. Inside / Outside % < 20 °C % 20 - 25 °C % > 25 °C inside 0% 84% 16% outside 34% 25% 41% Methods: I have taken the 5 minutely data from the wirelessTag sensors and calculated the median t...