Well I dunno - word must be getting round that I've 'done' a bit of RE so a mate who has just completed an off-grid house is looking to improve the overall experience!!
He has a Selectronic SP Pro (Aussie made) 5kw 48v inverter and he'd like a simple panel in the house reporting a few basic things - State of Charge, power in/out, expected duration at current load. Something that just sits on the wall and tells him these basic things like a barometer does.
The inverter has a 9 pin serial port as well as USB for configuring it using the proprietary SP Link protocol to a Windows only application. If I can get a few basic bits of information from the box via this serial port, I can display it on a character display using an Arduino. Trouble is, without setting up a Windows box, protocol analyser and such in his power shed its going to be a bit tricky so code up the Arduino unless someone has already done it
Anyone any info?