Just installed a MP2 grid tied, have setup ESS and works when the system grid tied solar is running. Maintains the net close to set point when charging batteries.
Issue is the MP 2 will not export, have been over all settings and nothing is jumping out at me. Hoping have missed something here.
Summary of Settings
TAB: General
System frequency 50Hz
Shore current 15.0 A
Overruled by remote unchecked
Dynamic current limiter unchecked
External current sensor connected (see manual) unchecked
State of charge when Bulk finished 95.0 %
Battery capacity 78 Ah
Charge efficiency 0.95
TAB: Grid
Country / grid code standard Australia B: AS/NZS 4777.2:2020 stand alone app. M (no N-bypass)
AC input 1 Above selected gridcode plus LOM B (compliant)
TAB: AS/NZS4777.2:2020 Australia B (Stand alone appendix M)
Volt-Watt curve voltage V1 195.0 V
Max charge power at V1 0 %
Volt-Watt curve voltage V2 215.0 V
Max charge power at V2 100 %
TAB: Inverter
PowerAssist unchecked
Inverter output voltage 240 V
Inverter DC shut-down voltage 50.20 V
Inverter DC restart voltage 52.20 V
Low DC alarm level 51.20 V
Do not restart after short-circuit (VDE 2510-2 safety) unchecked
enable AES unchecked
TAB: Charger
Enable charger checked
Weak AC input unchecked
Stop after excessive bulk unchecked
Lithium batteries checked
Disable VSense (for diagnostic purposes) unchecked
Configured for VE.Bus BMS unchecked
Charge curve Fixed
Absorption voltage 57.60 V
Float voltage 57.60 V
Charge current 39 A
Repeated absorption time 4.00 Hr
Repeated absorption interval 7.00 Days
Absorption time 4 Hr
TAB: Virtual switch
TAB: Usage
Virtual switch usage Do not use VS
TAB: Assistants
TAB: Assistant Configuration
ESS (Energy Storage System) (size:1012)
*) System uses LiFePo4 with other type BMS
(This can be either a BMS connected via CAN bus or a BMS system in which the
batteries are protected from high/low cell voltages by external equipment.)
*) The battery capacity of the system is 78 Ah.
*) Sustain voltage 48.00 V.
*) Cut off voltage for a discharge current of:
0.005 C= 50.20 V
0.25 C= 49.50 V
0.7 C= 48.00 V
2 C= 46.00 V
*) Inverting is allowed again when voltage rises 1.20 V above cut-off(0).
*) Relevant VEConfigure settings:
- Battery capacity 78 Ah.
- PowerAssist unchecked
- Lithium batteries checked
- Dynamic current limiter unchecked
- Storage mode unchecked
Silence fan (size:46)
*) Disable fan during charge, when Auxiliary input 1 is closed.
Total size of all assistants including the required
(hidden) system assistants is: 1119
TAB: Advanced
limit internal charger to prioritize other energy sources unchecked
I am wondering if this has something to do with my grid energy meter. EM340 → RS485 ethernet → Cerbo, have written a custom .py file. Being my first installation I am not sure what is normal behaviour.
The meter appears to be functioning, shows under devices and values are present.
And the grid meter is in the correct position as well? Is it metering grid or PV?
If you remove all customisation does it work?
Did it work before customizing? What AC PV do you have? Is it on the input or output?
Grid meter is installed in correct location, reason for the customisation is main switchboard location and MP2 are two different buildings with only optical fibre between them.
As EM340 is supported with RS485 direct it might be worth I try running a temporary copper pair and testing. if only to eliminate this being the issue.
So you are aiming at feeding past the meter?
As a short test are you able to move it closer (it might be less work - obviously I don’t know all the details of your install) and try the feed in that way? Then move it back if it works and troubleshoot after?
Have attached a simple diagram showing the layout, Building 2 is new and has been used as battery storage location where Building 1 is the existing electrical installation and main feed in point.
Effort will be easier running a twisted pair 30m.
Idea is to use Building 2 as essential fridges/freezers running of AC-OUT, then be able to charge of Building 1 solar system then supplement (Net zero) feed-in during night hours.
To be honest only just discovered those tonight. Has put me in two minds now, use the zigbee solution or replace the grid meter with a Victron (provides ethernet and much faster update rate) pricing is very similar.
This still hasn’t ruled out my original problem, bad ESS configuration or meter connection.
A temporary cable, just for testing purposes, could be an option. It would help you in differenciating between grid metering or configuration as the possible sources.
I’m also seeing a similar issue with my 3x 5000VA 48V MP2s in three phase where the MP2s are not feeding excess solar into the grid and are instead frequency shifting and lowering the power output of my Fronius inverter and eventually shutting it down with a high voltage.
My Fronius Symo 15kW inverter is set to MG50 grid code and my Victron MP2s are set to AS/NZS 4777.2:2020 stand alone app. M (no N-bypass) grid code. AC-Coupled Feed in is enabled in ESS and my Fronius inverter is wired into AC-Out and is configured in AC-Out in VenusOS/Cerbo.
I reckon you are on to something, as can confirm testing with AS4777:2015 code the MP2 will export with ESS work well. So it is not my energy meter as originally thought.
Interesting… The reason I thought this might be the case was that the CEC website has only certified the MP2 for: “Stand - Alone Inverter With Grid Input - Battery Only”. Grid input being the operative words here…
