Wookey's data logging

[wookey]

New record temp for the year on Sunday 14th Sept. 87.6C at top of tank. I put the second set of 20 tubes in at the end of August, but there haven't been many good sunny days since then (and us being away obviously lets the temp rise higher due to zero usage).

I've set up more sensors on the tank so I now have it monitored from top to bottom in 5 steps:
http://aleph1.co.uk/munin/wookware.org/control.wookware.org.html
That missed the high-point because the router was turned off whilst we were away for the weekend, so look at the logs on the control-box itself for the full story:
http://wookware.dyndns.org/munin/localdomain/localhost.localdomain.html

(note these are about 1hr behind because it takes the poor little thing some time to do all the sums for the graphs :-)

I have also instrumented the heat exchanger so there will be more graphs soon.

[wookey]

I now have the Plate Heat Exchanger sensors being graphed too - same URL. But it seems to be timing out quite a lot of the time (10 seconds) so lots of data points missing, and the solar in is colder than the solar out so methinks I've got something wrong. The timeouts are odfd - the tanks 5 sensors are read in about 2 seconds.

More tomorrow.

[wookey]

OK. I've fixed the timeout issues making readings unreliable and put in the right sensor numbers so the graphs reflect reality. Give it a few hours to make some sense (super-rainy here so nothing much will happen till at least tomorrow). I shall take the oppoertunioty of cool water for some plumbing...

[wyleu]

It's great looking stuff!

Have you got photo's of how you've mounted your sensors?

[wookey]

I have yes, but I need to download them from the camera and put them up.

The logging graphs now have some interesting data after first first day. One noteworthy thing is that I appear to have one sensor out of 12 which reads wrong. The main 'solar out' sensor is consistently 4 degrees low - I was suspicuous that this was the case already (as tank seemed to get hotter than panel). This is the same sensor that always reads '85C' if yuo read 'temperature' rather than 'fasttemp', which I posted about earlier in the year.

Also one can see that the temp rise thorough the PHE can be 25C on the tank side whilst the solar side drops about 2C.

The graphs badly need a 'pump on' indicator. Coming soon...