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I have moved all the mobile phone repeater discussions to a new thread here

Start a new thread you lot Not quite LED lighting now

For anyone interested in how a passive slab is installed you can take a look at my blog passivehouseselfbuild.co.uk. There is also a time lapse film covering the whole process.

One other note about MB and RS, they appear to have dynamic pricing so there are small fluctuations up and down on a daily or hourly basis - I was pulling my hair out trying to keep my spreadsheet up to date. This was the euro pricing so couldn't be attributed to ex rates.

The powerful LED strips need a lot of current and are very bright. Three across a 4m width seems more than adequate for me. I've found the best way to fix them is to paint or prime the surface, then stick on a length of 50mm wide aluminium tape (the stuff used to join insulation sheets), rub the aluminium tape down well and then stick the LED strip down the centre of the line of tape. This makes the LED strip adhere better and also seems to make the strip run a bit cooler, which in turn helps the self-adhesive backing stay fixed. For power supplies, I've used ventilated aluminium cased 12V supplies, wall mounted. The bright 5630 strip needs about 3A per 5m length at 12V, and I opted to use three 5A supplies, like these: http://www.ebay.co.uk/itm/12V-24V-IP67-Waterproof-LED-Transformer-Driver-Power-Supply-CCTV-240V-DC-2A-5A-/291663843407?var=&hash=item43e885104f:m:mp4HSAn6fw0MWK4ZUIErztg I ran lengths of 1.5mm² T&E cable above the ceiling to feed the far end of each strip (I've used the full 5m on each roll) joined to either end of the strip and then with single 1.5mm² T&E feeds running to the power supplies, inside a length of conduit where they come down the wall.

The "Envoy" is the hub that the microinverters communicate with. It basically receives information from each panel, piggybacked on the power lines. I'm very surprised that someone is supplying microinverters without the hub, and even more surprised that they're asking whether your electrician has one (unless he or she is a PV specialist and would be expected to know about these things). We have an enphase microinverter setup. The units came with a 20 (or maybe 25) year warranty, which seemed pretty impressive. A good PV supplier should be able to do an accurate survey of your site and model the output and FiTs to determine whether micro or regular inverters are the best option for you financially. The guy who did ours was on our roof for over an hour doing the survey.