Can anyone tell me about this problem? I have  axpert 5 kw 48v burn out.

All 16 mosfet csd19505kcs in DC and 3 transistor irgp4063d  in DC to AC a burn out,nothing else, just this .

I change all this, and switch on the inverter. And it works! But just for a 5 seconds, then was restart, restart again, I switch off.

Then I mesuring it and it's all burn out again,all 16 mosfet in dc and 3transistor  in ac 

Can anyone tell me something about this???

 

6 minutes ago, Dejan said:

Can anyone tell me about this problem? I have  axpert 5 kw 48v burn out.

All 16 mosfet csd19505kcs in DC and 3 transistor irgp4063d  in DC to AC a burn out,nothing else, just this .

I change all this, and switch on the inverter. And it works! But just for a 5 seconds, then was restart, restart again, I switch off.

Then I mesuring it and it's all burn out again,all 16 mosfet in dc and 3transistor  in ac 

Can anyone tell me something about this???

 

I don't know enough about it but my understanding is that the spec on the capacitors on the DC side does not leave much headroom. As they fail or are about to fail they take the MOSFETS too. @Coulomb will be here soon.

33 minutes ago, Dejan said:

and 3 transistor irgp4063d  in DC to AC

That sounds different to the usual thing which affects just the DC/DC stage. Coulomb is your man.

On 22.06.2015. at 12:00 PM, Mart-Mari said:

Hi and thank you. Thing is that Eskom did not supply the power while the "bypass" sign was on. I checked that on my Smart Meter account. I think Chris Hobson is correct. He says:

"Bypass is enabled meaning that if overload occurs in battery mode the inverter will allow grid to bypass inverter. Page 19 program option 23 in the manual. May not be currently bypassing but the mode is enabled." Thanks again.

I am  waiting for this "couloumb"

14 hours ago, plonkster said:

That sounds different to the usual thing which affects just the DC/DC stage. Coulomb is your man.

 

15 hours ago, Chris Hobson said:

I don't know enough about it but my understanding is that the spec on the capacitors on the DC side does not leave much headroom. As they fail or are about to fail they take the MOSFETS too. @Coulomb will be here soon.

I am waiting coulomb to help me...

8 hours ago, Dejan said:

 

I am waiting coulomb to help me...

No pressure, huh?  

Unfortunately, repairing Axperts is more of an art than a science. My colleage "Weber" and I have fixed one or two, but we've also repaired some and had them fail nearly straight away again.

When the MOSFETs blow, it's very common that some of the gate driver components also fail. Same with the IGBTs. Sometimes a failed component is obvious: it's blackened, and it might have a leg blown off. Sometimes it's more subtle: the epoxy is cracked, and when you look at it carefully you notice it. But sometimes it's really subtle: you have to look very carefully, and then you almost convince yourself that you can see a hairline crack.

So really you have to test the three sets of usual suspects: the 16 MOSFETs, the 4 IGBTs at the high voltage end of the DC-DC (opposite end to the inverter IGBTs), and the 4 inverter IGBTs themselves. If they're not short circuited and you can measure about 0.43 V drain to source or collector to emitter reverse biased, and no leakage gate to source or emitter, then they're usually fine. Of course, they all have gate to source/emitter resistors, so to be sure, you have to remove either the MOSFET or the gate resistors (and the MOSFETs have four in parallel).

I've written up a little on doing these tests here: http://forums.aeva.asn.au/viewtopic.php?p=65588#p65588

I update frequently, so use the index on page one and search for the keyword repair. (Yes, the index is getting that large these days... ).

The good news is, you may not need to replace all the MOSFETs for a second-round repair (but likely half of them).

Edit : Oh, and definitely replace the capacitors as Chris mentioned, with long life low ESR types, preferably the ones recommended in the post. 

18 hours ago, Coulomb said:

 

 

Thank you for the moment, I'll be back later, I have more questions, I have many axperts with same failure...

1 hour ago, Dejan said:

I have many axperts with same failure.

How many? :-P

15 hours ago, plonkster said:

How many? :-P

Too much

34 minutes ago, Dejan said:

Too much

I would love to eventually come up with a number of failures out of 1000, which I believe is how the industry measures this. Trouble of course is most of the stories are anecdotal, none of it is really scientific, and too many people chuck them in the bin and don't ask about it or complain to the manufacturer.

On the other hand, I think we've pretty much determined (anecdotally of course) on this forum that the Imeon is the worst of the bunch :-)

From 2013 to now I have had 3 ( 4048 MS- 5 KVA 48 V)  of them fail

All in the middle of Night ( cool, no Solar but on inverter duty as no grid available). Every time it was caps blowing out. ( 09 Error DC BUS Fail

Every time solved by dealer by replacing the whole motherboard  at my cost 

I have now started paralleling two and keeping one around handy. Still cost of three together is less than one Quattro 5 KW ( not evening adding the MMPT or Venus , mk3 etc)

 

50 minutes ago, ghatikar said:

I have now started paralleling two and keeping one around handy. Still cost of three together is less than one Quattro 5 KW ( not evening adding the MMPT or Venus , mk3 etc)

I have been running off-grid for 2 years now and unit is still behaving itself. I am about to parallel my unit with a unit of a similar age. I think one of the secrets to successful Axpert operation is not to exceed 80% of the inverter's capability.

 

3 hours ago, ghatikar said:

Still cost of three together is less than one Quattro

That probably explains the popularity of the blue stuff in remote hard-to-reach places. When you have to fly in with a Helicopter and walk the last 2 kilometer with a new inverter on your back, cost is really a minor issue.

I heard some really humourous stories, getting called out to a site because something is wrong, arriving in sub-zero temperatures to find that everything is working perfectly, it's just that the batteries are frozen :-)

On 19/10/2017 at 12:18 AM, plonkster said:

I would love to eventually come up with a number of failures out of 1000, which I believe is how the industry measures this. Trouble of course is most of the stories are anecdotal, none of it is really scientific, and too many people chuck them in the bin and don't ask about it or complain to the manufacturer.

The other problem is a severe selection bias. Those who had trouble post about it, looking for solutions. Those that have no problems forget about it, and don't tend to post about it.

But yes, I'd love to know the failure rate too, as long as it was reasonably accurate.

A friend bought 3 x 5kva Synerji hybrid inverters and connected them in parallel, however there is an issue with the monitoring the data on the software or ICC. I have done some more research on them and they are re-brands of Must power units, also assuming they are copies of the Voltronic inverters?

https://solaradvice.co.za/product/synerji-5kva4kw-48v-hybrid-inverter-60a-mppt/

Apparently you require a router / modem to communicate correctly. Any other way that they can be connected for monitoring?

 

 

53 minutes ago, Identity Seeker said:

re-brands of Must power units, also assuming they are copies of the Voltronic inverters?

Must is an unauthorised clone of the Voltronic, ie it's lower quality and not blessed by the makers of the original.

On 19/10/2017 at 10:05 PM, Coulomb said:

The other problem is a severe selection bias. Those who had trouble post about it, looking for solutions. Those that have no problems forget about it, and don't tend to post about it.

But yes, I'd love to know the failure rate too, as long as it was reasonably accurate.

I just got a feedback from Ipower installation engineer ( Voltronic rebrand for Nigeria) - Apperantely after 2016 the 60 and 80 amp models have a very low failure rate  apprentely less than 1 in 100. But most of these units are installed in banks with large battery banks with loads at less than 30 % except when the ATM starts counting notes. THE CC part is fully loaded with a 3 KWp panel setup 

1 hour ago, plonkster said:

Must is an unauthorised clone of the Voltronic, ie it's lower quality and not blessed by the makers of the original.

Are the Axpert inverters authorized?

The prices seem to be very close

18 minutes ago, Identity Seeker said:

Are the Axpert inverters authorized?

Axpert is a Voltronic product, Must is a knockoff.

5 hours ago, Identity Seeker said:

Are the Axpert inverters authorized?

 

5 hours ago, pilotfish said:

Axpert is a Voltronic product, Must is a knockoff.

Voltronic sells them under different names in different countries. In Australia I believe it is marketed as MPPSolar and I think it was also sold as Giant Power. In South Africa they were rebranded by Mecer (traditionally a computer reseller who also branched into UPSes). There were even a couple of Renesola rebranded units.

I still wonder why they used the name Axpert. It's like a deliberate misspelling of Expert. There are studies around that show the language you speak fundamentally influences the way you see the world, so speaking Mandarin must have this strange effect on you that some names just make sense even if nobody else gets it :-)

"Prima" televisions as well. Sold in South Africa under the name Sinoteq. In German (and Dutch I believe), if something is Prima, it is good!

Hi

I am busy with a re installation and are expanding to 4@5kva axpert.

 

Is there a correct way bring these unit on line.

 

I saw a youtube video that the the unit must be switch on at the same time which will be difficult as I have only 2 hands. Also then after they are on line the solar panels are been switch one

 

On 11/30/2017 at 10:31 AM, Chris Hobson said:

Cobus Rademeyer?

YES ITS ME

 

I would think switching them on literally simultaneously is about the worst thing you can do, but I'm used to other equipment (that can detect AC on their output and protect themselves in case of misconfiguration).

This manual (around page 14) says you first apply battery power to all, then configure them to run parallel, and then switch them all off again. Then you turn the units on in order, and they will sort out master/slave bits. Then you turn on the AC on both inverters. It says you'll get an error if one inverter has AC and the other doesn't, but it restarts automatically so the errors resolve themselves. Then once they are all happy, then you turn on the output breakers.

It almost sounds as if you should turn on the output breakers with no downstream load, and then turn on the main breaker to start supplying the loads.

Thanks Plonkster so the same consept with 4 units

 

 

 

 

Hi, on getting a parallel setup going..

After everything is connected correctly, ensure the inverters are switched off at their switches.  Now apply PV power to them so they can wake up (they will start charging as well).  Now go one by one and set the parallel setting to PAL  (assuming single phase).  Once done for all inverters, start switching them on one by one.  Wait for the AC out to come online on the first one before switching on the second one etc...

Note, the PAL setting can ONLY be set when the inveter is "awake" and switched off.  That state is only possible with PV power connected in an off grid setup.  If your PV is not yet available, you can get to this state when you apply battery power but you have to get into the menu quick as it will turn off again if there is no PV detected.

Hope that helps.

O, and if you did all this and you still have issues I have seen that it was required to turn them all off (disconnect battery) and power back on again.  I only had that scenario twice in many many installations and can't say why it happened.