Fronius and PVoutput

I've been playing around with - it's a community site which lets you quickly and easily publish live details of your solar panels. I couldn't see a pre-built library for my model of Solar Power Inverter - the Fronius - so I thought I'd build one. Important: the PVoutput API doesn't run over HTTPS. […] Read More

The Solar Solstice

As regular readers know, we've installed solar panels on our house in Oxford. The panels were originally installed on 17th December 2013 - that's pretty close to the winter solstice, where the UK experiences the lowest hours of sunlight. Today is the summer solstice. Time for Druids to dance around Stonehenge as we celebrate the […] Read More

One MegaWatt, Baby!

I looked at my Solar Generation meter and winked. My new Google Glass snapped this picture 116 days ago, on the darkest day of the year, we had our solar panels installed. They have just ticked over the 1MWh mark. The average British house uses about 10kWh a day. By our estimates, our house uses […] Read More

Measuring Solar Generation on a Fronius Inverter

Currently, I have four ways to monitor the total power generated by my solar panels. Check the meter. This is the most accurate way - but it is located inside a cupboard. Read the total from the Fronius API. Unfortunately, this rounds off to the nearest kWh, so isn't brilliantly accurate. Use the Fronius API […] Read More

Graphing My Solar Panels (Open Source)

I've only had my solar panels for a few weeks, but I'm already trying to hook them up to the Internet of Things. I'm using the Fronius DataManager card. The API is fairly well documented - but you should be aware that it offers no authentication! The API is Read-Only - but I would still […] Read More

Solar Panel Cyber Security

My friend Marc Rogers, the eminent security consultant, was quoted the Guardian talking about his predictions for information security and cybercrime in 2014. The ongoing development of the internet of things will continue to impact cyber security in 2014, as attackers now have more potential entry routes to sensitive governmental, corporate and personal data than […] Read More


(With a little upfront investment). I've blogged before about our Solar Panels and how they're performing. Liz and I have recently moved house, and decided that it made sense to get panels on our new property. Basically, we're so capitalist that we can only enjoy the warm glow of Earth's yellow sun when it is […] Read More

The British Summer Generates 1.5 MegaWatts Per Roof

A couple of years ago, we had solar panels installed on our roof. We based our power generation estimates on the Europa Solar Calculator which estimated that they would generate around 2,700 kWh per year. Every few months we take a reading and see how the panels have been performing. Our meter reading for the […] Read More

Solar Update

Another in my occasional series of blog posts about our solar panels. We used both the Energy Saving Trust Solar Power calculator and the Europa Solar Calculator to estimate a generation capacity of between 2,500 and 2,700 kWh per year. We've just done a reading for 21 November to 21 February. Right in line with […] Read More

How Our Solar Panels Have Performed After 1 Year

Last year, Liz and I took the plunge and had Solar Panels installed on the house we rent out. I've been tracking their progress, and so now it's time for our yearly update. We based our estimations on the Europa Solar Calculator which estimated that they would generate around 2,700 kWh per year. Annoyingly, we […] Read More