brianfoshee/modbus-redis

Reads data from a Morningstar Sunsaver MPPT solar charge controller and saves it to a Redis database

Reading data from a [Morningstar Sunsaver MPPT] ssmppt and storing it in Redis.

Since inception, many improvements have been made to this project. It pulls data every 5 seconds, stores it to Redis, then can send it to a remote server as JSON to be stored and analyzed.

This runs on a Raspberry Pi. Requires [hiredis] hired and [libmodbus] libmod. Required is a USB to RS232 converter which connects to the [Morningstar PC Meterbus adapter] meterbus.

Basis of the modbus from [this blog post] tom-blog.

To setup a Raspberry Pi with Arch Linux see [rpi-arch-setup] arch-setup

Work to improve this:

• send to statsd/graphite
• Visualize with d3 (realtime and archived)
• Clean up collect.c
  • DRY up data accessing and number conversions

[A few (older) images of the setup] flikr-set

modbus-redis's Issues

don't collect every datapoint every 5 seconds

Only things like solar output and battery voltage need to be collected with such resolution. Even then, when the sun goes down solar output can be collected less frequently.

have send.c delete redis keys after sending

keep the redis db from using too much memory at a time

rename repo

To something that better describes the project

split modbus request into 2 parts

The docs on the Sunsaver MODBUS protocol suggest requesting first half of registers in one request and the second half of the registers in another request.

split main into threads

one to collect

one to send every 10 minutes or so