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Power issue with Multiplus Compact in ESS System

Hello,

I'm using a Multi C 24/1600/40 in ESS configuration. Everything works fine, but the Multis max. Output Power is about 1050W. img-20210121-220350.jpgIn the datasheet normal Power of 1300W is written. If I disconnect ACin, the Multi works fine with about 1500W for short time. screenshot-20210121-221120-comandroidchrome.jpgWhen I reconnect ACin an the load of my House exceeded 2000W, and no Inverter Limits are set, the Multi Power ist max. 1050W to Grid. screenshot-20210121-220332-comandroidchrome.jpgBecause i run an AC Couplet PV Inverter I test it at night, by set "Grid Power" to -1500w for short time. Is this normal? If it, I wish to see a little note in the Datasheet that in ESS no 1300W possible, if not, can someone tell me about an issue? My config was already seen by distributor and he said it's fine.

Thank you

ESSmultiplus compact
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3 Answers
xpuser85 avatar image
xpuser85 answered ·

Now it works. The issue was the Firmware. I'm very happy and thankfull. Thanks for your time. Have a nice weekend.

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Paul B answered ·

I would suspect you are going into over load and thus the Inverter is Derating.

the Multiplus 1600 range is 1600VA (Not watts) at 25Deg C , so if the units tempature increases above 25Deg C then the 1600VA max Limit decreases.

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xpuser85 avatar image xpuser85 commented ·

The installation of the multi is in my cellar with about 17degrees room temperature. I thought that the multi will switch to overload above 15 or 30 seconds, but the output power does not exceed 1050W for 1 second...

screenshot-20210123-105113.jpg

Here you can see that even if it's 40 degrees, it should generate 1200W...

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Paul B avatar image
Paul B answered ·

Try it on a resistive load IE a water heater,

also whats the Internal temp, is the cooling fan turning on when needed.

It depends on input volt as well so if the volts drop then the current increases, this also has a limiting factor as well


another problem is whats running and whats the Power factor if the item has Hi leading or lagging power factor this will also reduce max output.


Please be aware I am not saying these are your issues, just giving you some pointers to look at

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Paul B avatar image Paul B commented ·

Another one to look at is the internal cut off voltage setting if thats been changed then it could be set at two high a voltage should be around 20 volts.

you will need a KM3 to look at that

1611397795907.png

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Paul B avatar image Paul B commented ·

Or in the ESS have you set a limit inverter power ????.


Another one to look at is the internal cut off voltage setting if thats been changed then it could be set at two high a voltage should be around 20 volts.

you will need a MK3 to look at that

this is overriden in the ESS assistant, so check the settings there (the below is a example of a 48 volt system)

1611398193929.png

1611397795907.png

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seb71 avatar image seb71 Paul B commented · 
you will need a MK3 to look at that

Or via VRM.

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xpuser85 avatar image xpuser85 Paul B commented ·

If you like, I send you my vsc file. No secrets in there. I test it with a technical hot air dryer which I can set to 80, 970, and 1500W, so it it a Ohmic load. On ACout without grid, no problem, but with grid connection in ESS only 1050W compensate by Multi. As I wrote in my first question, there is no limit set to inverter while the test runs.

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