The first step of my plan, building a Raspberry Pi based photovoltaic monitoring solution, is finished. I created a python package that works with the Kostal Piko 5.5 inverter (and theoretically should work with other Kostal inverters as well) and offers a clean interface for accessing the data:
#create a new piko instance
p = Piko('host', 'username', 'password')
#get current power
#get voltage from string 1
The next steps are collecting the data and processing it.
The library can be downloaded from https://pypi.python.org/pypi/pikopy
The code is on Github: https://github viagra en ligne achat.com/Tafkas/KostalPikoPy
A friend of mine had a photovoltaic system (consisting of 14 solar panels) installed on his rooftop last year. As I was looking for another raspberry pi project I convinced him I would setup a reliable monitoring solution that will lead him to an access to the data in real-time data. The current setup comes with an inverter by the company Kostal.
The Kostal Piko 5.5 runs an internal web server showing statistics like current power, daily energy, total energy plus specific information for each string. However, the visual layout of the the web page and the bundled software look like they were designed in the late 90s and development has been abandoned:
The power inverter itself logs data at either a 15 minutes interval for about 100 days or at an hour interval for about 400 days. At the current setting the 15 minutes interval has been selected. Furthermore my friend took notes irregularly from the built-in liquid-crystal display.
The final plan is now set. A Raspberry Pi would fetch data from the inverter, store it in a database and a web application would render the results to a browser:
The project is live at http://solarpi.tafkas.net