On 2022/06/28 at 10:34 PM, ibrahim007 said:

I setup as bypass mode and im receiving E72 and sometime error E60

Fault code 72 is to do with current sharing; fault code 60 is excessive power fed into the inverter's output.

Either of these, especially when in bypass mode, to me suggests problems with the AC-out wiring. Are the outputs perhaps daisy chained? Are the cables different length or wire gauge?

I have the same problem......

Is the problem solved ? How and thank you very much

On 2022/02/04 at 6:32 AM, Mariud said:

Good Morning All

I've been struggling with error 72 since I've installed my second inverter. Firmware was updated by Mustek( 2x SOL-I-AX-5NB in parallel) to the latest firmware last week. Mine have the same symptoms like al others on this post. Any new development on resolving error 72?

Regards

Marius

Can you share the firmware file of 

axpert king 2 5000watt inverter?

On 2022/06/28 at 3:34 PM, ibrahim007 said:

I have three inverter working in parallel Kit configuration, I setup as bypass mode and im receiving E72 . problem solved after hard reset and input DC and output AC breaker shutdown, then up the breakers and restart the inverters one by one.

 

some times, Master one goes down

some times slave one goes down.

it happeneds some times when PV solar power goes suddenly down and up.

anyone can help to solve my issue. 

i have AXPERT 2 volteronic inverters 

output of all inverters are combined to give one source to house.

AC input is feeding the inverters only to charge the batteries while before inverters the switching is done via contactors to switch between solar and utility power

 

br

 

I am experiencing the same problem, I have found that this error only occurs when power is lost from the grid and operating on battery/PV and happens very frequently when the power is fluctuating from the PV mainly on partly cloudy days. The current workaround I have found is to turn off the PV and only use battery when power is lost from the grid. However this could be a problem for anyone else that are completely off grid.

Hope this helps until a proper solution is found.

Today I received a document from the company in China that sold me the invertors addressing errors 72, 08 and 60. They suggested to put 18uF/600VDC across PV terminals. I can't however find capacitor with that kind of a specs so not sure if it isn't bs.

sop of capacitor(31-013935-00g) assemble to pv terminal ( f72&f08&f60 and flicker issue).docx

22 minutes ago, R79 said:

Today I received a document from the company in China that sold me the invertors addressing errors 72, 08 and 60. They suggested to put 18uF/600VDC across PV terminals. I can't however find capacitor with that kind of a specs so not sure if it isn't bs.

sop of capacitor(31-013935-00g) assemble to pv terminal ( f72&f08&f60 and flicker issue).docx 3 MB · 2 downloads

Thanks for sharing, I cannot see anything wrong with such a mod, the 18uf600v may be very difficult to source though. If impossible to find, you can go higher eg 22uF, and if 600V is a problem, you can go with 2x450V in series, but then need to double the capacitance (eg 47uF) 

 

1 hour ago, BritishRacingGreen said:

Thanks for sharing, I cannot see anything wrong with such a mod, the 18uf600v may be very difficult to source though. If impossible to find, you can go higher eg 22uF, and if 600V is a problem, you can go with 2x450V in series, but then need to double the capacitance (eg 47uF) 

 

Actually I thought of experimenting with putting DC capacitors across PV terminals before they sent that document to me. I have already ordered a couple of much larger capacitors 4700uF/450V. I'm bit nervous about the safety of such thing but other than that I should be fine, right? Also I'm at around 350V on my PV arrays so 450V capacitors should be sufficient I believe.

Edited March 3, 20233 yr by R79

4 hours ago, R79 said:

I have already ordered a couple of much larger capacitors 4700uF/450V.

Wow, those must be huge. Be very careful with those, they will store a massive amount of energy. The charge on them could be lethal for several hours if you don't have something to bleed it/them off, and even then it could take 10 minutes to be come non-lethal. These will be polarised; observe polarity.

I think that film capacitors would be better in this application. They are better suited to absorbing the high frequency surges in voltage that you find with switching  power supplied (such as the solar charge controller). Unfortunately, these will have to be X2 type or better, as they are across a significantly high voltage, and these capacitors are notorious for not lasting well, but that can't be helped.

Even 18 μF will be physically large and a challenge to fit inside the inverter. Use moderately thick wire (around 1 mm²) to the PV terminals, preferably with eye terminals crimped on. As already mentioned, they won't be very cheap, and you will likely need to source them from an on-line electronics retailer like Digi-Key, Mouser, element 14/Farnell, or RS Online.

On 2023/03/03 at 10:08 PM, R79 said:

Today I received a document from the company in China that sold me the invertors addressing errors 72, 08 and 60. They suggested to put 18uF/600VDC across PV terminals. I can't however find capacitor with that kind of a specs so not sure if it isn't bs.

sop of capacitor(31-013935-00g) assemble to pv terminal ( f72&f08&f60 and flicker issue).docx 3 MB · 6 downloads

Thank you for sharing! Has anyone tried it already? When I was experiencing the flicker problem last year, I tried electrolytic capacitors 100uF/400V on PV input without any significant results. But I guess the electrolytic capacitors had a really high ESR, so maybe grid foil capacitors (X2 type)could be much better.

My intermittent solution is that both PV strings (East and West) are connected only to one inverter using diodes.
In this way, the parallel operation remains stable, but limits the max PV input to just one inverter.

You may care to look at a similar document I found in my downloads folder today. The .docx document I refer to in the description is the one above. The one I found has very similar text, but also pictures on how they expect you to do it. And also the size of the capacitor; I'm pretty sure the one in the photos is a lot smaller than 18 μF 600 VDC. Maybe 1.8 μF.

Edit: Duh, link.

 

Edited March 6, 20233 yr by Coulomb

Since installing 600VDC 22uF capacitors two weeks ago I haven't experienced any error 72. 🤞

Edited March 21, 20233 yr by R79

On 2020/07/12 at 7:42 AM, Coulomb said:

Where did you buy these capacitors

 

Thank you for the answer. I have ordered two capacitors. I have another question;

Why install capacitor inside inverter and not outside ?

8 hours ago, Steph40 said:

Why install capacitor inside inverter and not outside?

I believe because the source of the EMI is inside the inverter, the fix will be more effective inside than outside, where some unprotected cable could radiate interference. Best to stop it at or near the source. The metal case should prevent most EMI from escaping if the capacitor is inside.

11 hours ago, Steph40 said:

Thank you for the answer. I have ordered two capacitors. I have another question;

Why install capacitor inside inverter and not outside ?

I don't think it matters. It's just cleaner to have them inside. At the moment for testing I have them outside, maybe later I will put them in.

Hello 

I confirm that installing a capacitor on PV input of each inverter avoid the occurrence of F72 error 

My installation works well for a week !!!

Hi Steph40 and R79.  Has the capacitor sorted your problems out permanently?

I have three inverters in parallel and one of them has the same behaviour as described here and am hoping that the capaitor is the solution.

I can confirm that the capacitors solved my problem. Prior to this mod, the output voltage in my parralel setup was fluctuating so much that the setup was useless (flickering bulbs, turning on UPS etc...), now everything works fairly stable. But I recommend foil capacitors (grid ones, motor capacitors etc..) I used initially 400V electrolytic capacitors but after few days they heated up and vented (terible smell). Now using foil capacitors - they are bigger, but do not heat at all and have much lower ESR. You need at least 5uF, the more, the better - but be carefull when they are charged.

24 minutes ago, Vladimir said:

I can confirm that the capacitors solved my problem. Prior to this mod, the output voltage in my parralel setup was fluctuating so much that the setup was useless (flickering bulbs, turning on UPS etc...), now everything works fairly stable. But I recommend foil capacitors (grid ones, motor capacitors etc..) I used initially 400V electrolytic capacitors but after few days they heated up and vented (terible smell). Now using foil capacitors - they are bigger, but do not heat at all and have much lower ESR. You need at least 5uF, the more, the better - but be carefull when they are charged.

Thank you

On 2023/03/23 at 4:46 PM, Coulomb said:

I believe because the source of the EMI is inside the inverter, the fix will be more effective inside than outside, where some unprotected cable could radiate interference. Best to stop it at or near the source. The metal case should prevent most EMI from escaping if the capacitor is inside.

Hi Coulomb

 

I have the same problem as many of the other people in this thread.  I didn't know the problem's cause has for certain been identified as EMI interference yet, but I assume it could very well be.  If that's the case, do you think it's coming from the MPPT solar charger high frequency switching, specifically when solar power is low,  as some has suggested ?  

If that's the case, apart from installing the capacitors as suggested as  a possible fix, could it not also help to wrap tinfoil around the communication and current sharing cables as well to help shield them from EMI ?  

On 2023/07/20 at 8:57 PM, Plaasjapie said:

do you think it's coming from the MPPT solar charger high frequency switching, specifically when solar power is low,  as some has suggested ?

I agree that it's likely caused by the MPPT high frequency switching. However, at low solar power, while the MPPT has to "work harder" to boost from low voltage to the same bus voltage, the larger effect would be to reduce emissions at low solar power because the currents are lower. But I'm no expert in this area.

On 2023/07/20 at 8:57 PM, Plaasjapie said:

could it not also help to wrap tinfoil around the communication and current sharing cables as well to help shield them from EMI ? 

I'm sure you could get some benefit from that, but I expect the benefits to be quite small. The data cables will already be shielded, and the current sharing cables will be very low impedance and twisted as well.

Yes, shielding the cables will probably not help much, and also would be unwieldy and difficult to do properly in any case.

Interestingly, to add further evidence of EMI as the probable cause,  I found this post https://diysolarforum.com/threads/eg4-6500-inverter-shutdown-with-f80-fault-during-testing.55184/ , where the poster said he "discovered a significant amount of the rfi is from the mppt" - 

My inverter supplier is sending me those 600V capacitors to install on the MPPT connections, so hopefully that will solve my problem, as it apparently did for some other people.

I am also going to order some clip-on ferrite cores ( https://za.rs-online.com/web/p/ferrite-sleeves/1703331?gb=b ) for my solar cables and also for the serial data cables and the current sharing cables, just to double sure.  Torroids could probably also do the trick.  I have many of them around in old PC power supplies.

Edited July 21, 20232 yr by Plaasjapie
wrong link

On 2023/07/21 at 6:15 PM, Plaasjapie said:

 

My inverter supplier is sending me those 600V capacitors to install on the MPPT connections, so hopefully that will solve my problem, as it apparently did for some other people.

 

Have taken the time over the weekend on Sunday to install the 600V capacitors into my 2 parallel connected Axpert King II Voltronic inverters.  This is a working system supplying loads to my home during loadshedding, so is quite an inconvenience to shut the system down during this time.  

I have to report that unfortunately installing these capacitors did NOT work...  After working flawlessly on only AC supply the last week (as it did for months before I connected solar), very soon after I connected the solar to the inverters supply, I got the F80 and F72 errors again.  Whole system (both inverters) go into bypass mode, and have to be completely shut down and restarted.    It was a cloudy day, I might add, but a solar MPPT should not have trouble with this right ?

Now my supplier, Full Circle Solar,  want me to take out both inverters, and send them both to him so he can test it in his workshop !!  Leaving me without a backup solution during loadshedding.  Needless to say, this is very unacceptable and high disruptive and inconvenient.  

https://1drv.ms/v/s!AuPP1ik91xcWggkjTgz2GiCUeI8l?e=5O2cBV

After restarting the system after the Voltronic F80 error, I get this F72 error in the above video, and it goes away only after I wait for a while,  and then try restarting again .