Solar Power Report: June 2025
June was quite productive for our 8kW of west-facing panels in central UK. There has been some cloud, but I think the system still maxes out the 5kW inverter anyway. The battery is 9.5kWh and helps save us money over the darker months when we can charge it on cheap rate to run the house all day.
So far this year the yield has been:
- January: 95kWh
- February: 228kWh
- March: 676kWh
- April: 927kWh
- May: 967kWh
- June: 1044kWh
You can see that not much of this power went to the battery. I charge that up on cheap electricity every morning so that I can export as much as possible. I pay 8.5p/kWh for that and get paid 15p to export, so it makes economic sense.
I have tweaked things a little to earn more. As the battery is full at the end of the day I have set the system to export some of that after the sun goes down. With this in addition the system has earned me about twice as much as I would have to pay for the electricity and gas I used, so I will build up more credit for the winter.
Compare that to last year. This was before I started scheduling the charging so I exported a lot less and also the export tariff only gave me 8p/kWh. My supplier Octopus (referral link) are pretty good really. They are still looking into why my system sometimes trips out. It seems that others have experienced it, so they are looking to collect data to show the manufacturer. I have not lost too much from this issue, but it is annoying.
I saw some interesting news about potential changes to allow plug-in solar panels. These are already a thing in some other countries where people can hang some from an apartment balcony to reduce their energy costs. I know @louis88 has a system in Germany. Here there need to be rule changes as you cannot currently pump power into a standard domestic circuit. There is massive potential for domestic solar in the UK. With the current heat more people will be thinking about air conditioning and that can be expensive to run. You will need it most when the sun is out, so solar panels can provide at least some of the power.
I have wondered how much my panels contribute to keeping the house cooler. They are absorbing the sunshine and then there is an air gap under them. It may make a slight difference, but you have to be smart about things like ventilation and shading to keep the house cool. UK houses tend not to be designed for extreme heat as really hot summers have been rare, but they are becoming more common. We saw 40C a couple of years ago and that could become normal. In other parts of Europe records are being broken. This can be deadly for some people.
Solar is not perfect, but it gives people some agency in reducing their bills whilst contributing to cutting global emissions. The equipment prices have dropped massively in recent years whilst energy prices are likely to keep going up. I only wish we could have got solar earlier, but we are reaping the benefits now.
Shine on!
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Wow, that's a good return for June!
I never thought about that but they will definitely contribute to keeping the house cooler. I know from working in my attic that the tiles get tremendously hot in the sun and if there was something blocking that it would defo help!
Until I can convince the missus, I gave a small 100w panel and battery. I get most of my devices charged out of it which is pretty good!
I have a home made box that goes over my loft hatch to give a little insulation as it will get hot up there now, and cold in winter.
We have a small panel on the summer house with a car battery to run some lights. It all helps. I did consider having something like you have years ago just to get some benefit from solar.
I have been considering building done kind of summer house soon and maybe powering that by solar. Have to get my fix somehow!!
I'll have to put a small panel on the potting shed we're getting soon to run a light there too. Mind you, all these little solar lights that people put in their gardens are not much use at providing useful light. We have had some, but they tend to break easily so that's more e-waste.
They do break easy. We keep getting them and they often barely last a year. We need all approval light right enough. It's dark up here!
Great stuff and doing very nicely too. That guardian article is scary. Slovenia was 35 most of the time but there was some alpine air thanks to the Julian alps.
We could have more hot days this summer in the UK. At least it has cooled down a little for now. I was only outside briefly when it was 32C this week and that was enough.
It was fairly brutal wasn’t it?!
The office has aircon, but I am WFH today.
I think the ability to utilize those innovations might help consumers take control of their energy use more effectively.
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Reflecting and taking advantage of the resource is what this friend does to save the planet with his energy.
Haha that’s cool!
Leave it to a crypto person to squeeze a little profit out buying low and selling high! The decentralization (or distribution of end point more like) is a neat concept and I love seeing the progressive people getting involved and sharing their findings.
I wanted solar for various reasons, but playing with the settings is some extra fun. We have a few people posting about their systems on Hive.
@steevc, I paid out 3.100 HIVE and 0.000 HBD to reward 10 comments in this discussion thread.