Ramblings about PV and going “Gorilla”

Ok I admit, I’m a bit of a solar power junkie.  I’ve been experimenting with PV panels a while now (here, here, here, and here). I have a small 10 watt waterproof solar panel (the irony eh?) which I got a number of years ago that I use to keep a few GEL Cells topped up by leaving it in the window of the upstairs bedroom.  I have a pair of Evergreen ES-180RLs (24volt) which have been mounted on the shed roof for quite a while now, also, last year I picked up a pair of 80 Watt Panels (12 volts, off ebay) and a second hand 60 (12 volt) watt panel.

At the moment I’m using them to keep a battery bank charged. I have a 1500 Watt inverter/charger that I can run off the bank.  I split one of the circuits in the house so that I can plug it either into the consumer board, or the output from the inverter.  This circuit has on it, the central heating pump and burner, fridge, fridge freezer and one double socket in the kitchen, i.e. an extension lead can be run to the TV/Radio Shack.  This is just the way the house was wired, so I took advantage of it. I also have an external 220v connection that I can feed in the output of a generator. The inverter is plugged into this, and if it is receiving power from a generator, it can power the house circuit mentioned above and re-charge the battery bank simultaneously.  My only issue with the inverter is that when the charging circuit is running, it generates an awful racket on the HF bands. I’ve used it a few times during power outages, Watching T.V. when the rest of the housing estate is in darkness is interesting, and generates interesting questions afterwards (how come you had lights on etc.). I also can run the items in the shack directly from the battery bank, but, to be honest, it’s a bit messy, and not very efficient.

The 60 Watt I bring with me on AREN events, as its useful at keeping the battery in my X-Trail or the Mobile Command Post (MCP) topped up:

The 60 Watt panel works surprisingly well for this purpose.  On several (rare) sunny events in the last 12 Months, we didn’t require any generators or external power at all on the day.

Anyway, back to my main point.  I happened to visit John Ketch a few months back, and he was particularly happy with the advice he got from Nigel in mysolarshop.co.uk as to panels and other items. As I had been thinking about getting a grid-tie inverter to experiment with, I took Nigels details and in February I rang him.

Our initital conversation was not what I expected. I outlined the various bits and pieces that I have, what they were doing etc, and said I was interested in getting a grid-tie inverter.  Nigel said to go away and think long and hard about what I’m trying to achieve and come back to him after I’d done that.

So, I go away and re-examined what I wanted to do.  Between the server and radio gear I leave running 24×7, plus the usual stuff like alarm clocks etc, I have about approximately a 400 Watts of continuous load in the house.  So I decided to do several things. Replace the server with something that uses less power, more intelligently use the radio equipment i.e. only switch it on when a satellite is visible, and see what contribution a grid-tie inverter could make to offsetting the usage.

Typically, I’m tackling the last one first.  So my plan was to split the panels, and use the two 24 volt panels with a grid-tie inverter, leave the two 12 volt panels to charge the battery bank.  So I rang Nigel again about a week ago. This time things went better, in that I actually convinced Nigel to see me an inverter! I went with a Steca Grid 300 from mysolarshop.co.uk.

Now,before agreeing to the sale Nigel pointed out that though the inverter does automatically shut down should the grid fail, it does not conform to EN50438, which the ESB require in order for any installation to be approved. I looked at the specs, and decided that in the grand scheme of things, my (potential) 300 watts isn’t going to make much of a difference, and that if he didn’t tell the ESB, then neither would I.

This morning at 08:00 when I plugged it in, the inverter was producing approximately 60 Watts, which I think is very impressive given the low light levels. It will peak somewhere between 180 and 200 Watts (based on yesterdays performance) about 13:00, and still be putting out 60 Watts at 20:00. I’m monitoring both the general house consumption and the output of the inverter with an Envi CC128, so it will be interesting to watch it over time.

So there you have it, I’ve gone “Gorilla”. Many thanks to Nigel in mysolarshop.go.uk for the advice and assistance.

Solar Dynamics Observatory

The Solar Dynamics Observatory was launched in February of this year.  Earlier today NASA held their first briefing where pictures and some video clips were released. One word, stunning!

Significant data was gathered on the recent solar flares and Coronal Mass Ejections.  This are of interest to Amateur Radio operators as when they happen, the HF bands are pretty much unusable.

Still though, the detail is just stunning.

Irish IPv6 Summit

Its taking up quite a bit of my time at the moment, and rapidly approaching (19th May).  Registration opened today (finally!), and the (draft) agenda is:

08:30 Registration and Coffee/Tea
09:00 Ministerial Launch

  • Minister of State, Science Technology and Innovation, Conor Lenihan

09:30 Welcome Address

  • Mícheál Ó Foghlú , (Chair, Irish IPv6 TF)


10:00 KEYNOTE New Zealand and Ireland: IPv6 Deployment Challenges for Islands

  • Brian Carpenter, Professor (University of Auckland)

10:30 Irish IPv6 Policy

  • Roger O’Connor , Director of Business & Technology (DCENR)

11:00 Coffee/Tea Break and Networking


11:30 Dutch Experience with Fixed IPv6 Broadband

  • Marco Hogewoning (XS4ALL)

12:00 Campus Deployment of IPv6

  • Tim Chown (University of Southampton)

12:30 Irish Experience of Wireless IPv6 Broadband

  • Martin List-Petersen CTO (AirWire)

13:00 LUNCH and Networking

14:00 KEYNOTE: RIPE NCC and IPv6

  • Daniel Karrenberg, Chief Scientist (RIPE- NCC)

14:30 Irish IPv6 Deployment for Hosting Providers

  • Michele Neylon Managing Director (Blacknight Internet Solutions)

15:00 The Story so Far: IPv4 Depletion

  • Geoff Huston Chief Scientist (APNIC) (via Video)

15:20 Coffee/Tea Break and Networking

16:00 IPv6 Enterprise Strategy

  • Yanick Pouffary , HP Distinguished Technologist in IPv6

16:30 Panel Session: IPv6 Deployment Challenges

  • Yves Paindaveine (EU Commission)
  • Mat Ford (ISOC)
  • Tim Chown (University of Southampton)
  • Dennis Jennings Board Member (ICANN)
  • Dave Northey (Microsoft)

17.30 Finish

Looking forward to seeing you there!

Has computer Security improved in 15 years?

Not much apparently:

Matt Blaze

Don’t get me wrong; cryptography was, and is, important. But in 1995, broken or weak cipher algorithms and implementations were the least of our problems. Has anything improved since then?

Hmm. We’ve made some progress on #4 and #10, but basically, not much has changed in 15 years.

Read the full text here. Worth reading for anyone with any interest in computer security.

NAMA not a public body…

… and neither is Anglo Irish Bank, read more here and here. While Gavin will probably not be successful in the long run. Given that it is in the taxpayers “interest”, the government created one institution, and it is the taxpayer has paid to keep another from closing shop; it is annoying that the taxpayer has no visibilty as to how either organisation is being run.  It is almost insulting. I wonder would a highly visible facebook campaign ala the campaign to keep 24 hour cover with the Waterford based Coast Guard Helicopter bear any fruit in this case? Good luck with your enquiries Gavin.