question

loxley avatar image

[Multiplus II 48/5000 (240v AC)] AC In (grid) limited to 1.8kW in 'Inverter' mode (ESS Mode-3).

Hi all,


I recently got ESS (Mode 3) working on a MultiPlus II 48/5000, with a 300Ah LiFePo4 pack.


I'm able to control the import and export (setting AcPowerSetpoint through MQTT, topic W/<VRM_ID>/vebus/261/Hub4/L1/AcPowerSetpoint).


However, I've noticed that the import/export from/to the grid (AC In) is limited to 1.8kW, when charging or discharging. This limit isn't there when in Passthru mode.


Some examples:

'Maximum import' mode (i.e. full charge):

AcPowerSetPoint: 6000.

Expected: AC in would ramp up max rate service AC out load and to charge batteries with remaining power.


'Maximum export' mode (i.e. full discharge):

AcPowerSetPoint: -6000.

Expected: AC out would be serviced by the batteries, while AC in would ramp up to max negative value (export), supplied by batteries (-100A on batteries). I've observed this -1.8kW Grid value, even with low AC loads value (~0.6kW), but don't have a screenshot at the moment.


Maximum import rate with full AC out load:

AcPowerSetPoint: 6000

Observed: AC out is at max load (cooker, kettle, other loads on) for a limited time, at ~6.3kW. AC In is limited to ~1.9kW, with the 4.9kW being supplied by the batteries.

Expected: AC input would go to maximum to supply the AC loads, with any excess going to charge the batteries.

Here's more details of that instance, from the VRM portal:


Passthru mode, high AC out load:

AcPowerSetPoint: not being set (so not actively controlling setpoint). The AC in (Grid) isn't limited to 1.8kW here.


Here are the firmware versions installed:

MultiPlus II: 475

Venus GZ: v2.58


Is there a setting I've misconfigured that's causing this behaviour (1.8kW limit in AC in, when in charging/discharging a.k.a 'inverter' mode)?


Many thanks and Kind regards,

Duncan.



MultiPlus Quattro Inverter ChargerMultiplus-IIGeneratorcurrent limit
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1 Answer
loxley avatar image
loxley answered ·

Right, I think I might have found the answer:



I'll change this setting and report back.



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