Posts tagged with "power"
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How Much Money Did My Solar Panels Save? - 2023 Edition
A long time ago I wrote a post on how much money my solar panel was saving me. In the post I promised to write another post in November 2022 with updates. Well, lots of things happened and I completely forgot about it until one reader reminded me requesting for an update. So here it goes. It has been more than 2 years since I installed a 320W solar panel and I have been diligently collecting data from my panel, our consumption and how much we are pulling from the grid. Very recently I finally finished my code to fetch the data, massage it and used some nice libraries to draw the graphs so I can analyze the data.
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Savings Due To Solar Panel
Last year, around this time, I wrote a post on how much money my solar panel was saving us. I was supposed to write a follow up to it after one year, but I completely forgot about it. Thankfully, a reader reminded me to give an update and here I am. Unfortunately even after one year I still did not finish the software that was supposed to instantly tell me how much I am saving each month. I should be able to get that information because I have a bunch of sensors monitoring my solar panel system. They measure the power generated by the panel, the amount of power we are using at home and how much power we are drawing from grid. All that data is stored in the cloud in Firebase. Yet I did not finish that part of the software. And to think I am actually retired. Wonder where all my free time goes. Anyway, in this post I will give a guesstimate using our electricity bills as a proxy.
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Solar Panel Output Under Various Conditions
In a previous post I talked about how my sensors tell a story regarding our power usage. There are still many more stories that the sensors can tell us about how we use electricity and how much solar power is being generated. Have you ever wondered how the solar power output looks like during the course of a day? Let me give you a hint – it almost looks like a half-rectified sine wave. It was a really interesting discovery. How about the output of solar panel when the day is cloudy? I have answers to all these questions and more in this post.But first let me walk you through the whole setup that I have at home.
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Sensors Tell A Story
After having set up my solar panel, I installed a bunch of voltage and current sensors in various places to collect data about my power usage and also to keep track of how much solar energy is being generated. The plan was to optimize and maximize solar power usage. I want to eke out every bit of power from the panel and optimize the hell out of solar energy. I also wanted to build some visual artifacts (graphs) out of the data. If you are like me, crazy about data, and data analysis, then this post is for you.
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Follow-up to Virtual Meetup #7
Thank you to everyone who joined the virtual meetup #7. We had a very low turn-up but we certainly had a lot of questions. This post is a follow-up to that meeting so you know what we discussed. As it usually happens, the topics we covered varied quite a bit from investment related things to solar panels to taxes.
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How Much Money Did My Solar Panels Save?
It has been more than 6 month since I installed my lone 320W solar panel. So I wanted to check if it was doing me any favors and how much money is it saving. Normally one should wait for a full year to make any kind of useful analysis. But I get easily excited when it comes to doing any kind of data analysis and here I am at it again. It is a very small installation and hence the savings aren’t huge, but at least I am able to verify my predicted numbers (units of electricity) against the real numbers. Did I have any savings or was this whole solar panel project a waste of my time and money. Let’s find out.
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Getting The Most Out Of Solar Panels
It’s been a while since I updated you on my solar panel project. I thought I should continue where I left off. So after collecting all the data from my solar panels, batteries, grid and load, I observed something interesting. While the SMU was disconnecting the grid so that the load can run on batteries and solar energy, we are not fully utilizing the solar energy. During a perfectly clear day, the solar panel is generating more power than we can use during the day. The excess energy is just getting wasted. Can we do something about it?
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Our Real Power Bill Inflation
In the last post I showed you that the electricity inflation over the last 9 was around 7% in Bangalore. Of course the inflation depends on how many units you use. If you are in the lower or higher slab than me then perhaps the inflation may be different for you.
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Power Bill Inflation
I don't normally talk about my inflation numbers in this blog, because I don't have a lot of data. I am the kind of guy who needs data to talk about things. To make sense of inflation we need at least 7 years worth of data. Ten years data will be more useful though. Thankfully I have some of my electricity bills since 2012. So there is long enough history to see the inflation in electricity bills in Bangalore.
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