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robertg66 asked

2 x MP-II 5k not working in Inverter mode, why?

Hi,

I have 2 Multiplus-II 5k-70 parallel, connected to 6 x US3000, Cebro GX (2.62) and a Fronius Primo on AC-Out1. What I don't understand is why the MP-II stops working when they are connected to the grid and in 'Inverter' mode. They work when connected to the grid and in 'Charge only' mode. They also work when they are in 'Inverter' mode and NOT connected to the grid. Who can help me to find the problem why they don't work when connected to the grid and in Inverter mode? Dealer is saying they configured the Multiplus correct and can't find a wrong setting.

To test and to find the problem I exclude the cabling and the in-house circuit (also the Fronius) therefore I connected the Multiplus's directly from the Main grid circuit breaker to the Multiplus 'AC-In's (cables are same length, no fuses or busbar in between). On the AC-Out1 I directly connected a load (no busbar or breakers). When I switch the MP-II on it takes them multiple tries before connecting to the grid. When and if it succeeds the loading to the battery is very unregular and fluctuating. One of the multiplus is making a unregular fluctuating humming sound. After 2-6 minutes the MP-II shutdown (no error in the VRM portal). Sometimes they restore and sometimes they stay off.

All settings that I know of (from the manuals) are set. 'Limit Inverter Power' is switched off.

I am lost... why does it work in other modes and not when in Inverter mode?


Robert

Multiplus-IIbattery charging
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robertg66 avatar image robertg66 commented ·

A remark, I have the feeling that when connected to the grid the Multiplus's are being limited, hold back. I can see the all the value going up and down. I measured on AC-In the volts fluctuating between 220 and 235 volts.

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ddickov answered ·

Hi Robert would need to see your multiplus settings to confirm it is set to transfer the grid through to ac1 out, this maybe disabled in the system settings, have you checked both multiplus’s are running the latest firmware also. If all checks out I would maybe suggest sending it to victron to inspect it thanks david

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robertg66 answered ·

Hi David, Tanks for your reply. What would be the best way for you to check the settings? Both are running on firmware 2623475.


Robert

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ddickov answered ·

If you have a Bluetooth ve direct adapter, Could use the iPhone app or android to view the current firmware version, just save your settings also before you do it, if you are using the laptop or pc a MK3 to usb would be required, this can be paired with victron connect for windows and that would update the units to the same firmware as they both have to be the same to operate correctly, if you could screen shot your settings and post them in the reply thanks

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ddickov answered ·

Hi Robert if you are able to I would try a power down and the. Re boot them both and see how you get on.

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robertg66 answered ·

Goodmorning David,

Sadly I don't have a MK3 to read or adjust the settings. The installation was setup by the dealer a few days ago (it's a new installation). They forgot the ESS Assistant what I have done myself (using VRM Portal). The dealer thinks the problems are related to the house installation. Something disturbing that effects the working of the Multiplus. I checked everything and couldn't find a problem. Step by step I want to check and rule out things. The dealer is 450 kilometers away, I asked them to ship a MK3.

When it arrives I will share the settings. In the mean time it's running on 'Charge only' mode.

Robert

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seb71 avatar image seb71 commented ·

If you added the ESS assistant using VRM, then why do you say you can't see the inverters settings?


From your initial description it sounds as one possible cause could be that you don't have a grid code set.

But if you added ESS, that requires a grid code, so you must have something set there.

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Related Resources

MultiPlus-II Product page 

MultiPlus-II Manual

Multiplus-II GX Online Manual

MultiPlus-II 230V Datasheet 

VE.Bus Error codes

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