Hello. As the title suggests, when the air conditioner starts, the lights flicker continuously. My setup is as follows: 2 x 3kV MultiPlus II inverters, a 10kW battery, and 25mm2 x 50cm cables. How can I fix this? Thanks everyone.
What is the power consumption of the air conditioner? It should be on the nameplate/certification sticker.
Where are these 25mm2 cables? eg between battery and a Multiplus II ? Or output of a Multiplus II and the A/C?
Please add a wiring diagram or picture of the actual setup. A 3kVA unit can handle up to 2400Watt but the higher the temperature, the lower this gets. Also. Are the units in parallel setup or split phase?
You can also look at the battery load and voltage in VRM → Advanced and then add a graph. But perhaps it isn’t a load issue,
but power factor or something else.. For now it’s like calling a Doctor and saying I have an itch. Can’t help without more info.
Sounds like an overload situation. Any red lights flickering on the MPII’s during this phenomena?
Good evening, sorry for the delay in responding.
My air conditioner consumes about 1kW/h and uses inverter motor technology.
No worries. During the peak current for startup, 1.5x to 2x more power needed, so that’s easily 2kW, which is most of the capacity of one MPII 3kVA.
Have you measured it’s peak startup current with a clamp AC current meter? or checked the specifications on the electrical certification plate?
Thanks for the reply. I have two 3kVA inverters = 6kVA.
And in any case, it doesn’t just do it at peak power, but almost all day, when the air conditioner is on.
Hello, no overload and no warning light, the inverters are 2x3kva=6kvA I only use 1kw/h for my air conditioner.
Hello, I have 2x3kva=6kva and 10kw of lifepo4 battery.
Cheap made inverter airco can put voltage spikes on the grid or have bad Power-factor; it’s possible that the Victron inverter does not handle this properly.
Air-conditioners from well known brands do not have this problems.
Inverter airco does not have inrush-current they start the compressor gradually.
Exactly that, never had any problems with our LG aircon running on 1ph of 3ph multiplus 2 5k setup
could also be just bad quality led lights, i see that a lot
You mean 10kWh? What battery/bms is it? What are it’s specs and, if managed, the ccl and dcl?
Inevitably, the battery can be the source of these problems.
With parallel systems, you can also have asymmetry. Have you checked that they are balanced?
I have a flow in the nodered section that can show this in realtime.
Good evening, I’m having a problem with my MultiPlus II inverter. When I connect loads above 1 kW, I get a voltage surge lasting about 1/2 second. Nothing happens, the inverter works normally, but it’s annoying and unhealthy for my electrical appliances. How can I fix it? Thanks.
@ You will have to provide more information and VRM graphs would definitely help. What types of loads, size of system cabling, size of system, battery etc.
Hello, I have 10kw of battery, cable sez. 35mmq, for 0,50cm long. Thank you.
I have 2 multiplus ii from 3x2 6kva.
To liitle information for me to be of much help. Try to identify the source e.g. specific device that causes it, ensure all the connections are well crimped and tightened to specification. While limited with min 1min intervals to capture data, use VRM graphs to look at the system parameters overall to identify e.g. anomalies in battery performance at the time etc.
Sometimes a particular load chops ths sine wave and makes something like that an issue. Or a pump control.
Adding an SPD will help if you can’t fid the source.
Other times its actually a loose connection. One system i found had a lights flicking brighter and dimmer issue, i found a change to the correct gauge ac. Wiring was the solution ( they were running 2.5mm on a 5kVa. Very undersized.)
Hi, sorry for the delay in responding. The cables are 25mm², I have two 3kVA inverters in parallel and two 5kW batteries = 10kW total.
The voltage fluctuations (flickering) happen even with just the 1kW air conditioner.
I checked all the terminals and they are tight.
I previously had a low-quality Chinese inverter and this problem didn’t occur.
Where should I place the SPDs? On the DC side, at the solar panel input, or on the AC side?
Thank you very much.