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Electricity prices steering tellstick...
by PetriK » Fri Nov 10, 2017 8:16 pm
Found this nice software nordpool-ifttt by samuel rinnetmäki that sends messages to ifttt depending on nordpool prices. Did some finetuning for it like finding the cheapest and most expensive hours in a day (initially the software only worked with fixed prices which is nice but not really suitable to control hot water heater or EV charing). Basically you can set how many expensive and how many cheap hours you want to have in a day and the software controls thee rest. The old limits like 40c and 10c low are there still too. You can also limit how many consequent hours can be expensive or cheap e.g. to avoid a situation where house gets cold.
Currently the messages are sent to IFTTT which is then linked with telldus but I will rewrite the code to use local tellstick api just in case the internet live.telldus.com is down when have a bit more time. It runs on node.js (v8.9 is needed) so you can have it on pc, linux, apple or almost any device. I installed mine on Synology NAS. Dev environment I use is Atom which runs node as part of the coding desktop making development extremely easy.
Code is found here: https://github.com/PetriKarjalainen/nordpool-ifttt/tree/PetriK
NPM installation packages is found here: https://www.npmjs.com/package/petrikarjalainen-nordpool-ifttt
In case youre interested in co-implementing tellstick native api just drop me a line petrik (a) tikkari.net
Here is console log for todays prices and what IFTTT events are created:[TAILING] Tailing last 15 lines for [all] processes (change the value with --lines option)
/root/.pm2/logs/index-out-0.log last 15 lines:
0|index | Running at (UTC) 2017-11-10T19:18:13.817Z
0|index | CET Expensive hours: 8,17,16,13
0|index | CET Cheap hours: 1,2,23,0
0|index | Scheduling: Friday 4:00 26.65 nordpool-price-normal
0|index | Scheduling: Friday 9:00 38.27 nordpool-price-high
0|index | Scheduling: Friday 10:00 32.1 nordpool-price-normal
0|index | Scheduling: Friday 14:00 36.9 nordpool-price-high
0|index | Scheduling: Friday 15:00 35.63 nordpool-price-normal
0|index | Scheduling: Friday 17:00 37.17 nordpool-price-high
0|index | Scheduling: Friday 19:00 36.52 nordpool-price-normal
0|index | Scheduling: Saturday 0:00 26.06 nordpool-price-low