Solar Power Battery – Powerwall!

Tesla unveils a battery to power homes from solar panels

Have just seen this on the news and it could well be something of interest to all those who have solar panels on the roof. It’s certainly new technology that I’m going to watch with a lot of interest. I cut my imported electricity use by more than half since I had my solar panel installation – if I can cut it further then that will be even better!

The Tesla web site has revealed


Energy Storage for a Sustainable Home

Powerwall is a home battery that charges using electricity generated from solar panels, or when utility rates are low, and powers your home in the evening. It also fortifies your home against power outages by providing a backup electricity supply. Automated, compact and simple to install, Powerwall offers independence from the utility grid and the security of an emergency backup.

Lots of questions to ask but this looks like the perfect partner for a home solar panel installation. Most of us are out when the sun is providing us with the best electricity yield and therefore a large part of our solar generation gets exported to the Grid. At night, when the sun has gone we then purchase the electricity back again at higher rates. So imagine the prospect of a device that holds some of this electric back for us to use instead of buying it back when the sun is either in or not brighter enough.

Harness - Store - Power

So for now well done to Tesla 🙂




Solar PV Feed In Tariffs Increase

The Solar Photovoltaic feed-in tariffs (FIT) will rise on 1st April 2015. This will be in line with inflation based on the Retail Price Index (RPI).

The RPI rate of 1.6% will be applied to the feed-in-tariff payments to solar electricity generators as from the beginning of April 2015.

This will see the top current rate of 48.07 per kW rise to 48.84 pence per kW. The export rate will also increase from 3.39 per kW to 3.44 pence per kW.

Solar feed-in-tariff rise 2015

These rates apply to the early adopters of Solar PV Generation. View the full tariff table of rates for the Feed-in Tariff Scheme for 1st April 2015 (PV Only).


Record Year 2014 – Solar Generation

December 2014 solar harvesting results and record year confirmed

And as already declared one month early, 2014 has been a record solar harvesting year! On top of this record I have also managed to get a great December too. The system generated more solar electricity than the previous four. OK it was only 6kWs better than 2013, but in a month known for poor returns I’ll sing its praises any way 🙂

December 2014 Generation Stats
Month Total: 66.67 kWs
Best day: 5.50 kWs 03/12/2014
Worst day: 0.07 kWs 26/12/2014
Generation per kW/panel: 33.34 kWs
Daily average: 2.15 kWs

December 2014 stats

Increase in Solar Feed-in Tariff rates

For qualifying solar panel installations, April 1st marked an increase in the feed-in tariff rates of 4.8% in line with the retail price index. Some solar power harvesters will now earn a rate of 45.4p / kWh

Technology – Solar
electricity (PV)

Tariff level (p/kWh)*

Tariff lifetime

≤4 kW (retro fit – pre 3rd March 2012)



≤4 kW (new build – pre 3rd March 2012)



 See the new Feed-in Tariff payment rates here

Solar Panel Generation Statistics – March (East-West Split)

Further to yesterdays statistic’s report for the South, South-East array,  The East-West split 2.64kW solar panel system also had a much better month generating over 186kWs with a daily average of over 6kWs.

The solar generation figures within the chart below also shows the highest daily yield so far of 10.18kWs on 26th March.

March Solar Panel Generation Statistics

March 2012 Yield - East-West Split

Solar Panel Generation Statistics – March (South, South-East)

OK, this must be where it starts! I did not anticipate March to provide such a kick start to the generation figures. I did feel it would improve slightly on February, but not as much as it did. The last week albeit yesterday I can’t ever see eclipsing, it was an incredible end to the month. Up until the beginning of March things have gradually got better, generation daily yields steadily increasing, but this month really does put my mind at ease knowing for the first time that my solar panel investment was a good decision. I know that I can only go on the expected average based on the statistics already returned, but if things continue this way then the March average has boosted things and knocked years off paying for my solar array installation.

See for yourself how the statistics have improved – the last week alone harvested almost 70kWs with an average of just under 10kWs per day. This same week also saw my new highest solar panel daily yield of 11.76kWs. The entry also shows that during the month of March 2012 my solar panel array yielded 196.90kWs of electricity from the sun, averaging 6.35kWs per day.

March Solar Panel Generation Statistics

March 2012 Yield - South, South-East