Solar Power on the Shortest Day December 22, 2009
Posted by Graham in : Kinsale, Permaculture, Renewable Energy, Tools and technology , trackbackIt is now exactly 6 months since I set up my 600watt at Derryduff.
Having now reached the shortest days of the year I am in a position to evaluate its performance, and I can say it has served me very well. Obviously there has been a huge difference in power availability between summer and winter, but in fact the last 10 days here have seen constant sunshine -along with freezing temperatures- and I have probably had more power so far in December than October.
As I said in the earlier post, on a system like this you cut your cloth according to your measure, so giving an account of my energy consumption would be misleading- I would use more electricity if i had it! In fact though I use and need very little- on average 1-2Kwh/day would be loads to run computer, one or two lights, radio and some power tool use. Some days I would use more, and I made good use of an electric chainsaw during the longer days. The only major increase in power consumption is likely to come from a washing machine which I intend to get in the near future, the model I am looking at only uses 1.2kw per cycle, and would easily be achievable on any sunny day any time of the year.
I did run short of power a couple of weeks ago and have invested in a small petrol generator as a back up, mainly to protect the batteries, and to ensure I need never be without some power if I want it. I have only had to run the generator on a handful of evenings during cloudy weather when I have run the batteries down with power tools during the day; it would not however be too much of a hardship to do without the generator and only use power when available.
To increase power availability I could put up a wind turbine, but at this stage it might be better to invest in more batteries- I only have approx. 1000Amph storage at present- and maybe a couple more PV panels. This might be sufficient as I dont expect to be increasing my electricity consumption drastically any time soon. The great advantage of PV over wind is that there are no moving parts, no maintenance and they are modular- I can add in more panels whenever I have some spare cash.
In short I am satisfied that I can live just on a modest solar array even in cloudy gray Ireland. For my situation it has been a good option; for a family of four, maybe not unless supplemented by wind.
I also want to mention my new Rayburn wood burning range that I installed in the cabin just this weekend. It replaces a cast iron stove, but I missed the range from the roundhouse for baking, and I am delighted with it so far. Ranges are a great option, doing everything at once: space heating, water heating, oven for baking, hob for cooking. It might require a little more wood than the stove, but that is one source of fuel I have plenty of. It should mean I use less gas for cooking at least in the winter months, and increases resilience as I could do without gas altogether if I had to.
Best of all, the range was free- many thanks to Liam and Ger who were replacing it with an oil burner, and to Ciara who pointed them in my direction!
We also got to play with the PV demonstration panel we have at the Kinsale college.
The meter reads 3.19 amps from an 80watt panel.
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