Home voltage analysis

I log the AC mains voltage at my house starting July 2013, you may recall my post where I was concerned about the unusually high voltage readings at home. Now that I have few months of data collected, it is time to do some analysis. I have 405835 measurements in total since then, taken every…

Yet another power monitor

I seem to be doing power monitoring projects a lot, started with this one, then moved on to this, then this and now I am again putting up a power monitor.. This particular will be using a small transformer with two secondary windings: one will be used to power the circuitry and the other for…

Analysis of electricity usage per year

I started collecting electricity usage data in April 2012, and wanted to check how am I doing this year compared to last year. Of course, as of today, only few months overlap (May-August), but still that will give me some idea if all my energy use optimizations have effect. I started by exporting the daily kWh…

Domestic hot water for free

Tricky blog post title, mostly true, but as you know there is no such thing as free lunch 😉 Anyway, those of you following my blog know that I have a Daikin air-to-air heat pump hacked into air-to-water solution for my place. As a bonus I get domestic hot water for both heating and cooling…

Every μA counts

When you run a project on battery, you are always thinking on how to conserve power so that you run longer. In the case of wireless remote nodes you do that by sleeping a lot and only waking up briefly to do some useful work (I know people that do the same). That requires a set…

Cheap DIY power monitor

My father asked me to create a standalone power monitor for him, he’d like attach it to some appliance and see its momentary and accumulated over time power consumption. Using OpenEnergyMonitor’s resources that was an easy task to do. I used a SCT-013-000 current transformer to sense the current and a 9V transformer to sense…

Hot water usage analysis

I thought it would be interesting to analyze our hot water usage, at this stage this is just for fun, but maybe in the future to make more it energy efficient. During the winter, I use my heat pump to also heat a 120l hot water cylinder as I have described here. I have no…

emonGLCD

Glyn from OpenEnergyMonitor surprised me pleasantly the other day by sending me an emonGLCD unit to evaluate – thanks! Building it was easy, and an hour later I had it working. Quite nice piece of hardware, a must-have for home monitoring and automation projects. I will be doing customizations in the future and make blog posts…