The first “real” days of summer?

Sunday, February 4th, 2024 at 10:38pm

So far this summer the weather has been pretty mild so it is odd to think that we are now in February and this is the first time that we have had temperatures in the high thirties. Based on my measurements we reached 36.2°C yesterday and 38.4°C today.

So how did my new air conditioners handle the heat?

I am still working out how I want the schedules and automation to work, but so far I have it that a calendar entry for 24#COOL#STUDY means that I will allow the study unit to be running at 24°C in cooling mode. The automation looks at the current outside and indoor temperatures and will not start the AC until they both reach 24°C

On Saturday that condition was met at 2PM and kept my study at a nice comfortable temperature. I also closed the exterior blinds and had the ceiling fan on low. Today that condition was met at 10:30AM and things also remained comfortable, though since there was plenty of sun I also turned on the bedroom AC unit and lowered them both to 22°C to see how that felt.

Speaking of sun… it was a nice clear day and the generation from my solar panels was the stereotypical ideal curve:

Consumption items of note are:

  • hot water running for an hour from 9AM
  • spikes at 10:30AM when I cooked an early lunch
  • increasing usage with the AC at 24°C and then further increase when both running at 22°C
  • spikes in early afternoon when I use the washing machine
  • a drop at 5PM when I switched back to one AC at 24°C

It is nice that most of this usage is covered by solar generation. The stats for the day so far are:

  • 29.6kWh solar generation
  • 15.2kWh consumed
  • 4.2kWh pulled from the grid
  • 18.5kWh fed to the grid

The reconfiguration of my account for solar finally got done a week ago, so now I am getting credit for what I feed back to the grid. For this day at my current rates the consumption balances the feed-in, making the cost just the daily supply charge. However this is just one day and it is the impact over time that is more important.

I also noticed something odd when looking at the generation from the inverters on each of the solar panels:

So ten of the panels are generating as you would expect for a clear sunny day. But what is up with the other two? In the enphase app the panels are laid out over an aerial image of my roof and I could see that the two panels with slightly lower generation are the two that are next to my tv antenna. So the slight shadow that casts is affecting those panels, changing from one to the other as the shadow changes. While I don’t watch free to air tv often, I won’t get rid of the antenna as there are a couple of shows I still automatically record to watch later.

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