question

edvanz avatar image
edvanz asked

Cerbo GX Current is wrong but voltage and watts are good???

The watts and voltage are correct but the Amps are way off, this causes an issue for my generator as I set the limit for the generator just below the max amps the generator delivers but Cerbo thinks it is consuming 5 or 6 Amps less than the generator is delivering but the voltage and wattage are perfect inline between the generator /or even shore power and the Cerbo. This causes the generator to go in overload and it trips the shore power all the time. To bypass this behavior I set the limit in the Cerbo 6 A lower than the shore power or the max output of the generator.

1688147409877.jpeg

233V is the same as my NL generator 8423W same as my NL generator but the Amps are wrong it should be 36,5A. Same for AC-out L1 also wrong. I thought that with the data the Cerbo has it should provide the right Amps calculation.

What have I done wrong???

Setup is 2x quattro 8000 , 1x Skylla , 2x Mppt 150/70 , Cerbo Gx , Centaur 16

cerbo gx
1688147409877.jpeg (29.4 KiB)
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

4 Answers
edvanz avatar image
edvanz answered ·

And today it is the other way around, it is driving me crazy

1688212148385.jpeg


1688212148385.jpeg (38.6 KiB)
3 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Alexandra avatar image Alexandra ♦ commented ·

Input 11.5 - loads= 327w difference

Loads (6.06 + 3,813 + 1.13 = 11.173 )

Losses due to heat (at loads like that fans will be running) and wiring inefficiencies and load power factor. I assume batteries and dc loads are being measure with shunts and so are accurate not calculated by the system

400ish watts on an 11.5kw draw is actually pretty decent.

1 Like 1 ·
Show more comments
cozzmicc avatar image
cozzmicc answered ·

Hi!

I have a similar problem: I'm reading from the CerboGX the values of my Solaredge SE10K via ModbusTCP. The values of the voltages are ok, but the values of the total watts are nonsense. I'm reading the values with QModMaster and my external Energy-Optimizer (Smartfox Pro2). Both the same. Screenshots of VRM and Win10. Oh, and beside this, the values of the watts are on an address (+1) not mentioned in the xlsx-file.

Loots of problems...

20230701-181936.jpg

Thanks for answers!screenshot-20230701-182158-chrome.jpg


screenshot-20230701-182158-chrome.jpg (145.0 KiB)
20230701-181936.jpg (6.2 MiB)
2 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

edvanz avatar image edvanz commented ·
I see, don't understand nobody from VICTRON jumps in and explains why this happens or some experienced dealers. Maybe we should post this in the development section too
0 Likes 0 ·
Alexandra avatar image Alexandra ♦ edvanz commented ·

...https://community.victronenergy.com/questions/5889/new-victron-community-guidelines.html

screenshot-20230702-080522.jpg

0 Likes 0 ·
screenshot-20230702-080522.jpg (156.4 KiB)
edvanz avatar image
edvanz answered ·

Hi Alexandra,


I know this and I am very thankful for the volunteers to try to help out but some dealers can't answer or don't take the effort to find out the answer and here sometimes Victron staff and the better dealers are helping out. This problem is not a new problem Brians post from 23 March is indicating the same problem and he tested it and found out that is only happens when you have parallel products in your system

1688360494274.jpeg



1688360494274.jpeg (115.7 KiB)
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

nickdb avatar image
nickdb answered ·

The current reading hasn't aligned for a long time, if ever, and there doesn't seem to be intent to change it for various reasons.

You are trying to compare apparent current with real power, these won't align.

The multi is not a particularly accurate measurement device, nor is it very quick, so external meters will always be better than the internal one.

There are timing delays within the multi and externally so what gets shown on VRM, via multiple sources, may not originate from the same moment in time and thus won't align.

Yes it is annoying but unfortunately it is the way it is and I don't expect to see it change any time soon.


1 comment
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

edvanz avatar image edvanz commented ·

Thanks, Nick, at least it is nothing I have done wrong but why sell DCM panels to control the intake Amperage and even have support videos about how nice this is for power assist and not blowing the fuse on the shore when you are in a marina? Still don't understand when it displays wattage and voltage correctly why they can't do the math and display the corresponding current

0 Likes 0 ·