Hello,
I have wrong measurements.
Did someone see this problem ?
System
3x230V without N
carlo gavazzi EM540 as grid meter, programmed as 3P
Induction stove on three phases after grid meter, before Victron
Rest of the house on essentials AC out (2P)
Solar panels with inverter (Huawei) on essentials out.
input from solar panels also measured with an EM540, programmed as 2P or 3P (print screen). That does not change the error.
Batteries 28kWh, independent BMS
Both carlo’s with RS 485 tot USB connected to Victron
Firmware V3.66 (most recent stable firmware)
When there is no sun then the essentials is measured correct.
When there is sun one phase of the sun measurement is always copied exactly in the measuments of the essentials (print screens: 577W and 1284W.
Approximately the same but not exactly the same error happens at the other side:
Print screen 593: Battery is full, return to grid. Induction stove is off but 1171W is measured.
And I measure always an incorrect Voltage (140V).
The power measuments of the grid and the sun are correct.
Yes, typical Belgian. Delta it is. (3x230V without N)
I can live with the wrong voltages measurements as long the consumption would be correct.
I cannot see why the PV echo’s exactly in the essentials (577W and 1284W). That’s an error. Also the non essentials is wrong: nothing was connected. It should be zero or near zero in both printscreens.
Tx for looking with me.
I have the same problem here, same configuration, only difference is that there is nothing connected to essential loads.
As soon as the Multiplus charges or discharges the battery the AC Loads reading becomes wrong.
Here is an example, the AC loads is around 399 W stable (screenshot1).
On screenshot 2 as I force the battery charging the Multiplus sends 3465 W to the battery. Most of this power comes from the grid (no PV at this moment) and because the Multiplus is wired between L1 and L2 the grid meter reports around 2000 W consumption on both L1 and L2. It looks like the grid power coming from L1 is “assigned” to the battery charging and therefore L1 power becomes 0 W on AC loads. On the other hand the grid power coming from L2 is “assigned” to L2 power on AC loads. This is wrong.
On a 400 V Y installation the same action with a Multiplus wired between L1 and N would only lead to a power reading on L1 on the gridmeter with no change on L2.
So I think the AC loads calculation on VRM is not correct for a single Multiplus on a Delta installation.
It would be nice to have Victron confirm this and make an option to cover this type of installation.
