Categoriearchief: Solar Energy

ABB B23 Modbus RTU

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CONCEPT MESSAGE.

Connecting to ABB B23 Modbus energymeter.

I have the USB-RS485 plugged into a Debian Linux pc system (x86_64). I used the ModPoll tool from modbusdriver.com for basic connection testing.

#./modpoll /dev/ttyUSB0 -b 9600 -p none -m rtu -a 1 -r 23296 -t 4:int -c 6
  • Offset addres 23296 (or hex 0x5B00) should have L1-N voltage.
  • Read 6 next values also (-c 6)
  • Gave me L-to-N and L-to-L voltages.

Wrote a small C application to poll every second and write to MariaDB/MySQL database table. Should be possible to recompile for Raspberry-PI (ARM) to.

Uses libmodbus(-dev) and libmariadbclient(-dev).

See attachments.

 

 

LM2576T-5 step down switching regulator

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First switching power supply working.

I have an ARM board to be powered, which draws between 0.5 and 1.5 ampere’s on 5 volt. Tried using an standard 7805 (2 ampere spec), but the system would not boot. VOut dropped to 4.5 volts and 7805 was getting to hot with +/- 24 volt VIn.

So i made an circuit based on the LM2576T-5.

Partslist:

Part Price
IC1: LM2576T-5 € 1,60
L1: Inductor 100uH € 1,45
D1: SR504 Recoverd from PC PSU 5.0 Amps Schottky Barrier Rectifier
C1: 470uF 35v Reused from other project
C2: 3300uF 10v Also recovered from PC PSU
F1: Fuse holder and 400mA Stock, price n/a

lm2576t-5-schemaInput voltage is an battery+solar power supply that varies between 23-24 to 29 volts.

Working power supply (left) with active load.
img_20160925_184405_edit

Bad output: (spikes)
What happens if an normal (or to slow) diode is used:
Yellow is regulator V-OUT.
Blue line represents voltage output for load (feedback signal).

img_20160924_194739_edit

Good output:
No load:

noload

100mA load

100ma_load

 

Borrowed lm2576 library for Eagle PCB Design from eaglecentral.ca | LM2576 circuit

Omniksol-4k-TL wifi kit

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Capture inverter data yourself? Or want to process generated data? Instead of using the Omnik Portal App?

I found out that it is possible to configure the wifi kit to send TCP/UDP packets to an remote server. After that i started googling around. With some minimal data i started write a small C program.

Some other related project on the internet:

  1. GitHub – Woutrrr / Omnik-Data-Logger | Language: Python | Found first
  2. GitHub – micromys / Omnik | Language: PHP
  3. GitHub – arjenv / omnikstatus | Language: C | Found after completing my own script 🙁

Those scripts are polling the inverter each few minutes. When my research started, i found out, by configuring the web interface, that Omnik also offers the possibility to push TCP or UDP packets to an specified server. With this enabled i started testing en developing.

Reading the message (which byte means what?) was based on the GitHub projects. So someone else did the hard work 😉

Getting started… (read on)
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