Review: Moixa Solar Battery

by @edent | # # # # # # | 4 comments | Read ~332 times.
A big white battery on a wall.

A few years ago, I took part in a local trial to install a solar battery in our home. The battery was excellent – and made a reasonable difference for our energy use. Sadly, last year, it died. It was prototype hardware, and these things happen. Moixa offered to replace it with an updated model…

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Six Months of Solar Power Stats

by @edent | # | 5 comments | Read ~171 times.

We’ve had our new solar panels for 6 months. Here’s how they’ve performed over summer. 3,361 kWh Generated 2,445 kWh Exported ===== __916 kWh Consumed Despite working from home every day, using laptops, monitors, microwaving lunch, we only used about 5.5kWh of solar each day. About 72% of our summer generation was sold back to…

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1,800 days of minute-by-minute solar generation as Open Data

by @edent | # # | 6 comments | Read ~287 times.
Solar panels on a roof.

Back in 2014, I released a year’s worth of solar generation data. I was enormously proud to recently discover that the data were cited in a couple of academic papers: Colantuono, Giuseppe & Kor, Ah-Lian & Pattinson, Colin & Gorse, Christopher PV with multiple storage as function of geolocation (2018) page: 217-232. Elsevier BV. Solar…

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Happy Solstice from @edent_solar

by @edent | # | Read ~125 times.
Solar panels on our roof.

Today is the longest daylight of the year. We had our new solar panels installed just after the vernal equinox – so now seems to be a good time to check in on how they’re doing. (Who am I kidding – I look at their output several times per day!) Today I generated 24.35kWh of…

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Comparing Solar Panel Generation – East/West split

by @edent | # # | 8 comments | Read ~159 times.
A graph of two solar generators. Both are fairly even.

We have just installed solar panels on our house in London. We also had panels on our old house in Oxford. How do they compare? Oxford London Latitude 51.753738 51.486880 Panel Size 4000 Watts 5040 Watts Orientation South East/West Split Obviously, it’s hard to compare exact weather conditions – lower temperature makes for more efficient…

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Relaunching @edent_solar. Part 5 – Getting data out of Fronius Solarweb

by @edent | # # # | 4 comments | Read ~129 times.
A big grey box with lots of wires coming out of it.

Mostly notes to myself. My solar panels have an open API. But it’s only available if I’m on the same network as the Fronius inverter. I can connect my system to so I can access it anywhere in the world – if I have the right password. SolarWeb has an (optional) guest mode. You…

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Some thoughts on selling electricity back to the grid

by @edent | # # | 7 comments | Read ~213 times.
Email from Bulb saying they've set up an export payment.

I have solar panels! The UK mandates that my electricity supplier buys the surplus energy off me. They set a minimum price, known as the SEG (Smart Export Guarantee). My supplier – Bulb – pay me 5.38p for every kWh I export. I pay them about 13p for every kWh I import. You notice the…

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Relaunching @edent_solar. Part 4 – Dual String MPPT APIs

by @edent | # # #
Graph showing the difference between east and west panels.

I’m hooking my solar panels up to the Internet! Installation Inverter API & Code My solar panels have an API! It tells me the total amount of power they’ve generated each day. But there’s a small problem… I have panels on the East and West sides of my roof. My solar inverter has two MPPT…

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Relaunching @edent_solar. Part 3 – API & Code

by @edent | # # # # | 2 comments
Solar Graph.

I’m hooking my solar panels up to Twitter! Installation Inverter Fronius provide a comprehensive API guide – I wish more companies did this. There are lots of unofficial libraries in a variety of different languages. I’ve written this code in Python3. This is a general tidy-up of the code I wrote several years ago. Here’s…

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Relaunching @edent_solar. Part 2 – Inverter

by @edent | # # | Read ~109 times.
A big grey box with lots of wires coming out of it.

Having solar panels on your roof is great – but you need something to turn their wicked DC electricity into pure and godly AC. This bit of kit is called an “inverter”. It’s a big box which lives in your roof working magic. This is what ours looks like: We chose a Fronius Primo inverter…

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