question

dewitpj avatar image

Getting WattHours from grid meter

Hi,


Currently I can only see KwH from the grid meter (one of the ET112's). Even though uint32 counters are used, I can still only see 1/10th of a KwH. This document that I have says that the scale should be 100 (the modbus register sheet, version 2.20) - how can I enable this or get a wH value ?


Thanks !

gridModbus TCP
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mvader (Victron Energy) avatar image
mvader (Victron Energy) answered ·

Hi @dewitpj, after rereading the list in excel, and its version in code [1], I think you can read up to 10Wh precision.

What are you seeing exactly? Always a 0 at the end?

[1] https://github.com/victronenergy/dbus_modbustcp/blob/master/attributes.csv

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Hi,


That is correct, I only ever see the counter increase in 10's:


55720
55720
55720
55720
55720
55720
55710
55710
55710
55710
55710
55710
55700
55700
55700
55700
55700
55700
55690
55690
55690
55690
55690
55690
55690


That is the phase 1 from grid meter, top is latest. This is taken even minute with a +- 900w load on it.


It is worthwhile to note that I use address 2622 for these readings as they should contain a uint32 (all three phases in and out) - At the time I figured they might have higher resolution, appear not :)


Thanks !