Data analysis How-to

Python Script to Retrieve SolarEdge Solar Panel Data

After having a rooftop solar array installed on my home in 2019, I wanted to analyze its actual performance and compare it to projections. In particular, we ended up with a smaller inverter (7kW) than recommended for our total panel capacity (11kW). We often experience some shading on our panels, so the inverter should not limit (or “clip”) the energy production too greatly – but I want to quantify the extent of the clipping effect.

That analysis is for later, though. Here is how I first retrieved the production data for my system from the SolarEdge API, in fifteen-minute intervals. It pulls data for both energy (watt-hours generated) and power (power production, in watts). I think the power is average power over that 15 minute period, though I don’t see that documented and it doesn’t line up exactly with energy generation. I’m a Python beginner and relied on my brother, who kindly wrote almost all of this code.

Setup: you’ll need your SolarEdge API key, which you can get by following their instructions (pp. 5-6). You’ll also need to install the solaredge Python package (and Python itself, if you haven’t used it before). In addition to an API key, the script below refers to a site ID. You can find that in the mySolarEdge app, under information about your site, or via the results of a query to the API.

DIY How-to Making Parenting Repair

DIY non-slip soles for footed pajamas

I’ve handed down a few pairs of cozy footed pajamas between my kids. Along the way the soles lost whatever non-skid properties they had and became very slippery. We got them out this fall to keep my two-year-old cozy. He was cozy … and he slid all over on our slick floors, wiping out a few times. Neither slips nor cold bare feet would do. It was time for DIY non-slip soles.

I outfitted two pairs of Carter’s footie pajamas. Both attempts turned out great:

Try to slide in those!

Materials: I used a discarded bike inner tube that could no longer be patched. If you don’t have one, you might be able to score them from a bike shop or repair co-op. I also used heavy-duty Sashiko thread and needle, but I expect you could do this with any needle and thread.