Hello,
im using a new Multiplus II with ccgx EM24 and a 50kwh LiFePo4.
I noticed that the Multiplus 2 is not exceeding 62-63Amp Charging Power.
This is more than 12% les than in Specifications!?
Has anybody else this Problem?
Of course 70A Limit is set in VEconfig 3.
best regards
Michael
Hi,
Could you please post the settings from VEConfigure?
You can do so by selecting file, export and then copy pasting here.
Hi,
of Course.
REGISTERKARTE: Allgemeines Systemfrequenz50Hz Landstrom50.0A Fernbed. hat Vorranggeprüft Dynamische Strombegrenzung ungeprüft External current sensor connected (see manual)ungeprüft Ladezustand nach Abschluss der Konstantstromphase95.0% Batteriekapazität480Ah Charge efficiency0.95 REGISTERKARTE: Grid Country / grid code standardGermany: VDE-AR-N 4105:2018-11, internal NS protection LOM detection AC input 1Type B (grid code compliant) rise-in-voltage protection U>253.0V start network service HF treshold50.20Hz Use Aux1 as disable FeedIn signalgeprüft Use a fixed Cos Phi Filter time for input voltage3.3s Cos phi at point 11.00 REGISTERKARTE: Wechselrichter PowerAssistungeprüft Wechselrichter-Ausgangssp.230V Wechselrichter DC Abschaltspannung37.20V Wechselrichter DC Neustartspannung43.60V Schwellwert für Alarm bei DC niedrig43.60V Do not restart after short-circuit (VDE 4105-2 safety)ungeprüft Aktivierung AESungeprüft REGISTERKARTE: Ladegerät Ladegerät aktivierengeprüft Schwacher AC-Eingangungeprüft Stop after excessive bulkungeprüft Lithium batteriesgeprüft Ausgleichsfunktion verwenden (Röhrenplatten-Traktions-Batteriekurve)ungeprüft LadekurveVoreingestellt Konstantspannung56.80V Erhaltungsspannung54.00V Ladestrom70A Wiederh. Konstantspannungszeit1.00Stunden Intervall wiederk. Konstantspannungsphase7.00Tage Konstantspannungszeit1Stunden REGISTERKARTE: Virtueller Schalter REGISTERKARTE: Verwendung Verwendung des virtuellen SchaltersVS nicht verwenden REGISTERKARTE: Assistenten REGISTERKARTE: Assistenten-Konfiguration ESS (Energiespeicherungs-System) (Größe:1019) *)System verwendet LiFePo4 Batterien mit einem Zwei-Signal-BMS. *)Die Batteriekapazität des Systems beträgt 480 Ah. *)Sustain-Spannung 48.00 V. *)Die Batterie ist voll, wenn der Zusatzeingang 1 geschlossen ist und die Batterie ist leer, wenn der Zusatzeingang 2 geschlossen ist. *)Erhaltungsladungsphase erzwingen, wenn BMS angibt, dass Batterie voll und in Funktion "nur Ladegerät" umschalten, wenn BMS angibt, dass Batterie leer. *)Abschalt-Spannung für einen Entladestrom von: 0,005 C= 50.00 V 0,25 C= 48.00 V 0,7 C= 47.20 V 2 C= 46.00 V *)Wechselrichten wieder zulassen, wenn die Spannung 1.20 V über Cut-off(0) liegt. *)Relevante VEConfig-Einstellungen: - Batteriekapazität 940 Ah. - PowerAssist nicht ausgewählt - Lithium-Batterien ausgewählt - Dynamische Strombegrenzung nicht ausgewählt - Lagerungsmodus nicht ausgewählt Die Gesamtgröße aller Assistenten einschließlich der erforderlichen (versteckten) Systemassistenten beträgt: 1078
Well, what you can see that in the VRM portal e.g. the MP2 draws up to 4000W, charging the battery with approx 3400W.
And whether that is an coincidence or not: If you divide the 3400W pushed in the batts by 48V (nominal voltage), you'll get 70A exactly...
I have yet to see an MP2 that shows 70A in the VRM portal...
Hi
Depending on the temperature it will throttle back the charge power.
But it is never reaching 70A. So if i start with gridpoint 10kw the multiplus starts charging and reaches in seconds 62Amp. Some later the cooling fan starts.
but it says all time at around 62Amp.
Temperature is around 15 degrees in the technics room.
So are you sure that this is the reason?
will your multiplus reach 70A? And under wich conditions?
best regards
there are few other reasons for reduced charging power: DC voltage too high, ripple on the DC line, limited current on AC IN. But usualy is temperature or ripple.
Hi @Michael Schmidt,
The most likely cause of loss of maximum charge power is enabling the Weak AC setting in the Charger Tab of VEConfigure.
" Schwacher AC-Eingangungeprüf "
There is more explanation about why this is the case here:
https://www.victronenergy.com/live/multiplus_faq#derating_of_the_power_factor
It is recommended to try disabling the Weak AC input setting in the Charger Tab, and trying to improve the AC supply quality if you want to increase charge power. However, be aware this may result in no charging at all.
Hi,
the weak AC is already unchecked in the VEconfig3.
the translation seems to be a little unpricise.
do you mean i should try to activate?
No, it must be a mistake in translation.
It should be disabled, Weak AC unticked.
So the issue is elsewhere. Is the system on VRM for a closer look?
Yes the system is in VRM Portal.
what do you need for checking?
I have this exact behavior. Roughly a maximum of 60-63A DC charging, even before the fan spins up on my 48/5000.
For reference, on my 48/15000, which is specified at 200A, I get about 190A for a couple of minutes before it throttles smoothly down to ~160A.
I basically never get the rated spec on either unit.
I have the same problem and have not found an answer yet. Any progress, yet? Help or a hint would be very much apreciated.
Hi Tom,
thanks for the reply. I tried to check my setup based on your hint. I compared the smart shunt read-outs (which ought to be the "single source of truth") with the portal. The values are identical. So, where did you take the second screenshot?
In addition I would like to mention an odd observation. Using a different fan impacts power. Connecting a lower powered fan reduces charging power immediately (i.e. without a change in the operating temperature of the MP). Reconnecting the original fan restores the power level.
Kind regards
Rob
I do not have a shunt, the Watt-values in the VRM screenshot are provided by the MP2 and the BMS (I have an JDB BMS which I use via dbus-serial-battery in my Victron setup).
And: It is only "one" Screenshot from the VRM.
I added the MP2 values via "Settings" -> "System Setup" -> "Battery measurements". In my menu I see the BMS and the MP2 there and chose both to be displayed in the VRM.
And thanks for the hint with the fan. Since my setup is located in a cellar room I did not care to replace the noisy fan.
Best,
Tom
I still find it very strange since 2 independent measuring devices in my setup (Smart Shunt and JK BMS) measure the exact same power and current. And, as I said, the Smart Shunt MUST be accurate. 70 amps should be delivered with respect to the charging voltage. Even supposing that the 70 amps only refer to the nominal voltage of 48V, I do not see that current level when the battery is at its nominal level of 48 V.
If you are correct, I would be curious as to know why Victron shows currents in the VRM portal that are so far off?
Kind regards,
Rob
nope, I use the BMS + additional software to monitor the battery and calculate the charging / discharging limits.
The values of the MP2 are only shown as a reference and because they are available.
Your point about DC side / AC input side is correct - would need to check with the clamp ampermeter, I guess. Never did that so far.
But anyways: Would love to hear an official statement from Victron about that one if our assumptions about "nominal voltage etc" is correct.
Best,
Tom
I had a similar conversation with the guy who's building my boat, who has done *lots* of installations, mainly Quattro 48/10000 which is rated at 140A charging current (7kW). He says that he's never seen this even when the unit is cool and in a cold environment, current in the low 120s (>6kW) is the best he's seen.
