Category: solar

Ok, it’s been about a month, so lets look at some solar stats for the last 30 days. ( I have 10 solar panels outside my office window, for those new to the blog. I’m in the SouthWest UK)

Total power generated is 189 units. That’s 189 kwH, which at market prices is £23.62. Bad huh?

But wait a second… I earn 3p per exported unit (50% is assumed) and 43p Feed-in-tariff, regardless of usage, plus of course the 12.5p per unit the power would have cost me if I’d had to buy it. That means that really, each unit generated earns me 57p a unit, meaning I’ve generated £107.73. If we wanted to go mad, I’d claim 12 months of that is £1,292 :D

Obviously summer output is WAY higher than winter, but as a counter to that, we have had a shit 30 days in terms of sunshine (unusually so, the month before install was insanely bright).

Another reason to be cheerful in terms of future output, is that we have a big tree casting serious shade around 4PM. We knew about this, obviously, but didn’t realise the extent to which the late afternoon/early evening sun was going to be so bright here. Given that, we may well lop a few feet off the top (it’s BIG) and hopefully that should boost output a fair bit.

here is a chart showing the aggregated output over the time of day…

And a chart showing how massively it varies each day:

I’m sure I’ll be equally boring and geeky when we have lopped a bit of the tree and had a few days without it. Of course, then the sun will be lower overall…. Bah. comparing data is such a pain.

So the solar guys have finished and gone today. I now am the proud owner of my own little ground-mounted photovoltaic power plant. Check out the remote monitoring gadget for proof it actually works:

 

That gadget is the bluetooth-enabled sunny beam monitor that wireleslly connects to the inverter and lets you monitor output. Cunningly, it has built in solar panels itself, for power :D It also has a usb cable for you to power it, or to dump the historical data to a PC as a csv file.

Here is my ‘what I learned so far’:

Ground mount panels are BIG. They don’t look big on a roof, but stick 10 panels (roughly 2KW) on frames in your garden/driveway and you will be surprised how big they are. This isn’t something you want to do in a small suburban garden. We are lucky in that the drive for our house is unusually big and empty, looking more like a car park than a normal driveway, so we still have lots of room left. They need a lot of space between rows of panels too.

Planning permission for solar with a listed building is HELL. Either pay a company to do get the permission for you, to save yourself the hassle, or start the process a year in advance and prepare for stress. This varies by local council, and if your house isn’t listed, and they go on the roof, AFAIK you dodge needing this permission entirely. Lucky you :D

There will be a lot of extra hardware installed by your electricity meter/fusebox. You get a new (tiny) generation meter (middle top of picture), plus a new fusebox gadget (bottom of picture, with big phat AC cable coming into it from the inverter), and another little black box thing (under the generation meter, stuffed with big cables). Don’t assume it will all fit in a tiny space in a cupboard somewhere. We ran out of room and needed the fusebox gadget attached below. I’ll probably get it boxed in one day to look less industrial.

Prices are dropping big-time. My roughly £10k install was £11k just 9 months ago. If you got a quote for PV a year or two ago, get a new one. The panels are getting much cheaper.

Get panels with bypass-diodes. They are more expensive, but worth it. Mine are Schuco. With Bypass Diodes, shading on 1 panel means 1 panel generates zero. Without them, shading on one panel would mean all ten generate zero. This is a BIG deal. Don’t get them without bypass diodes unless you have a south facing roof in the sahara and no trees for miles. Not all panels are the same.

It’s very very cool to have lots of electrical stuff running and your electricity meter not moving. Especially on the day we hear there is another 16% rise in electricity prices. bwahahahaha. I’ll be contacting my electricity company soon to get a new meter fitted which can handle being supplied to. Sadly mine wasn’t one which spun backwards :(

You get a dedicated generation-meter which you have to manually read and report in order to be paid the feed-in-tariff (43p / unit). Entirely seperate to that is an agreement with the electric co that you get credited as exporting 50% of what you produce (extra 3p per unit). This is great,because I will use everything I produce and export bugger-all, so it’s free money :D. This happens because the electric co can’t be assed to install proper export meters.

Lots of boring generation stats to blog over the next few weeks, I’m sure :D. Already earned £1.50 yay!

Now back to programming stuff that explodes.

 

 

 

 

 

Panels all installed, trench for cables dug, final electrical connections friday morning, with any luck. Yay!

They almost look small from this distance…

For people who care, they are schuco MPE 215 (215 watt) solar panels with bypass diodes.

 

They will look a lot less industrial once they have been surrounded by some whicker-ish fencing, and some plants yada yada…

Anyone new to this blog: I have long-wanted solar power for my house. I’m sick of watching energy companies do sod all about renewable energy, whilst charging me ever more money for their coal-fired power that causes so many problems*, and I am also keenly aware that the UK’s feed-in-tariff means that it’s a VERY good investment. With interest rates this low, your money is better off on the roof than in the bank (at least until they lower the tariff for new adopters next year, so hurry!)  However, because my ancient pre-napoleonic house has a stone-tile roof, and is ‘listed’ I can’t put them on the roof, so instead, they are going in the driveway, which luckily is stupidly big for a house this small.

The installers showed up yesterday to start fitting the ground mount frames:

That’s the frame before most of it gets pounded down into the ground and then concreted in. It’s quite a cool system because hardly any concrete is used, yet they are very very stable.

Make no mistake, these are BIG and THICK and mostly HEAVY metal frames. These aren’t going anywhere, any time soon. Although obviously, should the need arise everything *is* eventually removable. There are very few good pictures of ground mounted solar panels in a domestic environment, so I thought I really should snap some. I found it hard to visualise them accurately before ordering it all.

This is the complete array of solar panel frames as it stands now. Two rows of five panels. The back row looks elevated, but actually it’s the same height, we just have a sloping driveway. The gap is needed to stop the front row obscuring and shading the back one. I’m assuming that tuesday will be spent mostly digging the (quite long) trench to take the power to the house. I bet no actual panels get attached until wednesday. I expect it to look a lot nicer and a lot less like an industrial oil-refinery outside my window when that happens. Plus the plan is to get some willow-hurdles to line the back and probably the sides of them to make them look less GRRRRR. I should point out that the initial reaction to these frames now is *Eeek, they are BIG!*. I can’t dispute that.

*I know solar has it’s problems, and personally I’m backing tidal power for the UK< but the thing is, for 95% of people, the ONLY renewable energy they have direct access to owning and installing is solar thermal or PV (wind doesnt scale down well, and there is no water nearby for hydro. House not airtight enough for geothermal), and our house has no hot water tank, ruling out solar thermal, so there was basically one possible solution, and this is it.