44 minutes ago, PaBz0r said:

Seems he has 4 of them, idling  

Correct.  4 X US3000 = 14kWH.

I also looked at Revov, but their BMS was not ready and they could not give me a timeframe for when it would be.  And I got the Pylons for slightly more than the Revov's price per kWH. Bargain.

 

 

@Ironman from who did you buy your Pylons from? 

@Jaco de Jongh

14 minutes ago, Ironman said:

@Jaco de Jongh

The I must drop @Jaco de Jongh a PM and find out what price I can get from him for the B2000 and 3000's. 

2 hours ago, Ironman said:

HW Rev 4

Can I just note that the hardware revision itself has nothing to do with this. It just happens to be the case that a particular revision was being built at the time. In other words, all philosophers are human, but not all humans are... oh hang on... I mean the affected units all have the same revision, but not all the units of that revision are affected 😛

 

15 minutes ago, plonkster said:

but not all the units of that revision are affected

Ok, good to know.  So does Victron know exactly which serial numbers are affected, or do they investigate it on a case by case basis, as they did with mine?

Also: For everybody that ordered the Multiplus II 5000 - can you confirm that none of the HW Rev 4 units are affected?

Edited November 11, 20196 yr by Ironman

16 hours ago, Ironman said:

And thus, that at 4000W, the current drawn from the battery is likely to be about 102*4000/4500 = 90 Amp

I know it is not important, since the fact is that the screw was of the wrong material to carry a high current. So whether it's 90A or 140A is immaterial, but just for clarity, I agree that the current from the battery may have been about 90A, but the current into the LV side of the transformer which that screw appears to be carrying is much higher than the current from the battery.

15 hours ago, Ironman said:

So does Victron know exactly which serial numbers are affected

Yes. The issue is that once they enter retail it's not possible to track them. There are an insane amount of third party resellers holding stock.

17 minutes ago, plonkster said:

Yes. The issue is that once they enter retail it's not possible to track them. There are an insane amount of third party resellers holding stock.

It would be nice to list the serial numbers on a site somewhere so users could check themselves.  I.e. if your multiplus is not doing any heavy loads at the moment, you'd only find out if this is an issue once you hit heavy loads - and then it will be a bit sad.

Edited November 12, 20196 yr by admiral

My 3.5kVa Multiplus II derates itself by 400W without fail after 45 - 50 minutes when inverting its max of 2400W. See the graph attached from this morning. Ambient temperature in the garage this morning cant be more than 23 degrees. I've seen the same thing happen in ambient temperature of less than 20 degrees. Is it normal to derate so soon in a mild ambient temperature?

See here for information about derating: https://www.victronenergy.com/upload/documents/Output-rating-operating-temperature-and-efficiency.pdf

The Multi does derate further, but what you're reporting does not sound normal. Are you sure it is the Multi and not something else, such as a managed battery?

1 minute ago, plonkster said:

See here for information about derating: https://www.victronenergy.com/upload/documents/Output-rating-operating-temperature-and-efficiency.pdf

The Multi does derate further, but what you're reporting does not sound normal. Are you sure it is the Multi and not something else, such as a managed battery?

How can I be sure - is there something I can check? What I can tell you is the battery is idling. There is almost enough solar power to cover the full load.

11 minutes ago, deapsquatter said:

is there something I can check?

How familiar are you with hacking into your GX device ? 🙂

If you root the GX device (see here), and you log into it using ssh (Windows people use PuTTY), and you run dbus-spy (that's a bit like regedit on a windows machine... don't touch things you don't know), and you navigate to com.victronenergy.vebus.whatever and scroll down to /Hub4/L1/AcPowerSetpoint, you can see the power level that is commanded by the GX device (how much it should feed into the INPUT). On /Ac/ActiveIn/L1/P you can see the actual power being fed in. Compare the two.

The idea is to see if the Multi is being commanded to feed in less, or whether it is slowing down on its own.

Of course this data is all sent to VRM, so you can also put in a support request and have someone check it for you.

This shows the battery working over that period. OK so it is working fairly hard at a battery temp of 32 degrees (single Pylontech 2.4 kW).

Thanks I am watching dbus-spy now....

How do I read this? Assuming the total its inverting is L1/P + L1/V?

Or L1/P + L1/S - but thats > 2400W?

/Hub4/L1/AcPowerSetpoint is 2937

Edited November 13, 20196 yr by deapsquatter

7 minutes ago, deapsquatter said:

How do I read this?

If I assume you forgot the negative sign on the AcPowerSetpoint, then the GX device is commanding the Multi to feed 2900W into the grid on the AC input of the Multi. The Multi is however only doing 2000W. The negative sign means the power is exported.

So the Multi is doing less than commanded. So it does indeed appear to be derating then.

L1/V is the voltage, L1/I is the current, L1/P is the power. L1/F is the frequency. I'm not sure what /S is but it is not important 🙂

See here for explanation of what everything does.

5 minutes ago, plonkster said:

If I assume you forgot the negative sign on the AcPowerSetpoint, then the GX device is commanding the Multi to feed 2900W into the grid on the AC input of the Multi. The Multi is however only doing 2000W. The negative sign means the power is exported.

So the Multi is doing less than commanded. So it does indeed appear to be derating then.

Yes that should be - 2937.

If it's derating how come the animation adds up? (in my mind I wouldn't actually have defined this as derating yet). (3372 + 386) - 2400 = 1358 which is what its saying.

This is a 3.5 kVA multi.

Edited November 13, 20196 yr by deapsquatter

1 minute ago, deapsquatter said:

This is a 3.5 kVA multi.

You sure? I've never heard of that model.

Send me your VRM link and I can take a look?

2 minutes ago, deapsquatter said:

how come the animation adds up?

Because it calculates the "AC loads" box by using the grid meter's reading and subtracting what's on AC-out. It must add up 🙂

 

So now it looks like this (worse)

/Ac/ActiveIn/L1/P = -1657

/Hub4/L1/AcPowerSetpoint = -2468

Is this a kW vs kVA thing?

You have to mind your P's and Q's.

Apologies -  I have the 48V | 3000VA Multiplus II.

Edited November 13, 20196 yr by deapsquatter

1 minute ago, deapsquatter said:

Apologies I have the 3000VA multi...

That makes more sense. 1657/3000 ~= 60% (a little less), and I know the Multi derates to 60% when it gets really hot. But I have never seen a Multi get that hot. Send me your VRM site link so I can take a look.

1 minute ago, plonkster said:

That makes more sense. 1657/3000 ~= 60% (a little less), and I know the Multi derates to 60% when it gets really hot. But I have never seen a Multi get that hot. Send me your VRM site link so I can take a look.

Sent - thanks