How-to build a solar logger for ABB Power-One Inverters
This guide describe the way to turn a plug computer into a websolar logger. Before starting here is the frightening mandatory warning :
Do not open inverter enclosure when under load. High-voltage can cause death or serious injuries !
Both AC and DC power must always be disconnected. Even though, this will not be still 100% safe as internal capacitors may remain charged after disconnecting all sources of power.
Use a ARM devices like a PogoPlug, a Raspberry Pi or an Odroid. These devices are quite cheap (less than 50euro), without fans and are really low on consumption. If you choose a Pogoplug, beware : The Pogoplug v3 isn't supported and the mobile version, have only one USB port !
You must also have a dedicated drive of at least 2GB but you'll be at ease with more.
For ABB inverters, you'll need a converter USB/RS485 (Prolific 2303 chipset or FTDI FT232) you can find one for less than 10eur on ebay .
Make a RS485 cable: Use a RJ12 or more conveniently, the terminal block. See your manual for the correct connexion. On RJ12: it is Pin 2 as TR+, Pin 4 as TR- and Pin 6 as Grnd.
The 120ohm resistor (S2) should be set to 'on' on the last inverters of the bus.
Setting up :
The whole installation may takes more than an hour. So, let's start by listening to DI and then, log on your router and assign a static IP to your box. You may also configure your router and forward the port 80 if you wish to access your box from the outside and use a Dynamic DNS service like FreeDNS. You can install a systemd timer to update the DNS.
(Edit the example and put the files in /etc/systemd/system/ then "systemctl start freedns.timer" and "systemctl enable freedns.timer".)
So, let's start by installing the excellent Arch Linux ARM Linux distro for plugcomputers.
Installation and configuration of the Plug :
Once you finish with Arch Linux, log in ssh and change the root password
Configure your system
To list available zones use: timedatectl list-timezones
Add you hosts name in hosts list,it should match the one you previously set
eg: 127.0.0.1 localhost.localdomain localhost Plugbox
Update the whole things and install converter drivers (may takes a while)
Your system will reboot. Login in using your new password.
Installation and configuration of the webserver :
Installing nginx and PHP
Put this nginx config file, this fastcgi_params and this fastcgi.conf file in /etc/nginx/
Configuring php :
uncomment (remove the ;) extension=calendar.so and curl.so
Enable nginx and php-fpm service on boot and start it :
At this stage you should be able to see your empty webserver running
Installation of the communication application :
Download the Aurora inverter communication application from here and compilators
Put aurora in your /home folder then extract
Make sure the communication with the inverter(s) work and is reliable ! (eg: aurora -a2 -T -d0 -e /dev/ttyUSB0)
Allow the 'www' user to run aurora and use the com ports :
Installation and configuration of SMTP :
If you wish to received email notification from 123Solar, install msmtp (Easy and simple SMTP client)
edit the configuration file /etc/msmtprc
The permission and ownership of /etc/msmtprc should be set -precisely- to -rw------- 1 http root
# Accounts will inherit settings from this section
# Gmail address
# Set a default account
account default : gmail
Look for sendmail_path option in /etc/php/php.ini and edit it like this : sendmail_path = "/usr/bin/msmtp -C /etc/msmtprc -t"
Installation and configuration of 123Solar :
Put the archive on your web server's folder then extract.
Go then in your browser for configuration (eg: http://yourIP/123solar/).
Once the http authentication files have been setup, you need to uncomment the lines "Uncomment those lines" in the /etc/nginx/nginx.conf example.