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I have an electric car, solar panels on my home, and a home battery. On cloudy days, charging my car drained the battery and drew power from the grid, which I wanted to avoid. I used Claude to write code for my EV charger and inverter. The code monitors my solar panels’ output and adjusts the charging speed so the battery still receives some charge without drawing power from the grid. Step-by-step: 1. I identified that charging my EV on cloudy days was draining the home battery and drawing power from the grid. 2. I asked Claude to write code for my EV charger and inverter. 3. I set up the code to monitor the output from my solar panels. 4. I configured it to adjust the EV’s charging speed based on that output. 5. I used the adjusted charging speed to ensure the home battery received some charge while avoiding grid power draw.

I used the OpenAI Codex app to develop an idea I had while talking with my wife about power companies raising their prices during periods of high demand. We recently paid up to 90¢ per kW/h, which is insane, but when the kids hear “90¢,” they think it’s nothing. They don’t understand power pricing—or even what a kilowatt-hour is. https://kilowhat.jiovanie.com/ In about 15 minutes, I had a fully working web app that approximates how much power devices in your home use and how those costs add up over a month. You can see the cost of a single device or set up all the devices in your home, specify how long each one runs per day, and build a full monthly tally of power usage. The app also shows how a “small” 20¢ increase in the price per kW/h can add up to a massive bill at the end of the month. I designed it to be completely free to use, with no accounts or login required, no personal information collected, and zero tracking. My initial prompt was: ```text "I want to create an interesting, interactive, and maybe even FUN app that explains what kilowatthours are and how a small change in the price of a kW/h can have a huge effect on your monthly power bill. I want to make this tool available for free to anyone so it needs to work across devices and OSs and even form factors. I want it to be fun to use so it should have lots of style and flair and be very interactive. a price slider and device selector will enable people to see how much their devices draw power and how much it costs to use." ``` After the initial creation, I discussed the changes and tweaks I wanted, asked Codex to create a logo, and decided on a visual style. Then I provided my web-hosting information so it could upload the app and make it accessible to anyone. Step-by-step: 1. I described my idea about rising power prices and the need to explain kilowatt-hours and monthly costs. 2. I asked OpenAI Codex to create an interactive app with a price slider and device selector that would work across devices, operating systems, and form factors. 3. I discussed changes and tweaks, asked it to create a logo, and decided on the app’s visual style. 4. I provided my web-hosting information so Codex could upload the app and make it publicly accessible.