I've recently installed solar panels and wanted to read the data from the generation meter, an Elster A100C. This project uses an Arduino sending data via USB serial to a server. I hope it is of use.
Thankyou for sharing this daveb, I have added a link from the community builds section
I ported the code to run on an emonTX:
Network ID is set to 11 as I am using another emonTX for live energy monitoring.
Does anyone know if it's possible to read kvarh measurements (i.e. reactive power) over IrDA from an Elster A102C?
Dont know the answer im afraid, I think the only items that can be read are the ones described in the class:
char product; // eg. "Elster A100C..."
unsigned char mfg_serial;
unsigned char config_serial;
unsigned char meter_definition;
unsigned char rate_1_import_kWh; // the reading we are interested in!
unsigned char rate_1_reserved;
unsigned char rate_1_reverse_kWh;
unsigned char rate_2_import_kWh;
unsigned char rate_2_reserved_kWh;
unsigned char rate_2_reverse_kWh;
unsigned char reserved_01;
unsigned char status;
unsigned char error;
unsigned char anti_creep;
unsigned char rate_1_time;
unsigned char rate_2_time;
unsigned char power_up;
unsigned char power_fail;
unsigned char watchdog;
unsigned char reverse_warning;
unsigned char reserved_02;
I will send Dave Berkeley who wrote the library an email to ask.
Trystan is right, the data from the meter is described by the class above, so no analysis of reactive power I'm afraid.
Many thanks for the reply. And thanks for emailing Dave, Trystan!
Just to confirm: are you guys talking about the Elster A100C rather than the A102C? The Elster website suggests that the A102C does measure reactive power, although it doesn't specify whether that measurement is exposed on the IrDA port. I've sent several emails to Elster but they haven't replied.
Have you guys tinkered with an A102C or A220?
Sorry, one more question: does anyone know where I can get hold of Elster's documentation for the output of their IrDA ports?
Found this on Google www.meterspec.com/143.pdf
Brilliant, thank you! (I clearly wasn't trying hard enough when I googled for the same info!)
I've also spoken to a very nice man at Elster.
The conclusion seems to be that yes, the A102C does spit out both kWh and kvarh readings over the IrDA port. Hurray! I'll almost certainly buy an A102C over the next few days and I'll report back.
Humph. Turns out the A102C isn't available in the UK. The AS230 might be a possibility though...
Open-source tools for energy monitoring and analysis. This project uses the GNU General Public Licence