Jump to content

Axpert max 8kw inverter overheating


Gilberto

Recommended Posts

Hello. I am having random error 2 on my axpert max inverter 8kw. Usually it is when it have solar, charging battery and giving load to the house. I have a pic of my solar assistant of the temperatures. What is the max temp for the inverter? What can I do to lower it? 

IMG_7260.png

Link to comment
Share on other sites

2 hours ago, Gilberto said:

What is the max temp for the inverter?

It's probably:

Inverter heatsink: 85°C on, 65°C off

Battery heatsink: 75°C on, 55°C off

Unless your fans are locked (warning code 1), in which case they become:

Inverter heatsink: 80°C on, 60°C off

Battery heatsink: 70°C on, 50°C off

Those are from Axpert Max 8 kW firmware version 90.06.

It's likely difficult to get the separate temperature measurements, though the undocumented Q1 command does respond with the required readings. Alas, the Q1 command is not documented, and the reverse engineering I did for some MKS models does not apply fully to the Maxs. There is also the hassle of getting the Q1 command through the display. It's perhaps best to just assume that your problem is the battery heatsink, as it has the lower temperature limit.

Quote

What can I do to lower it? 

Just the obvious things: make sure that the fans are indeed working, clean out any excess dust. Ensure that the inverter has adequate ventilation and is not positioned where it will get direct sunlight. There is a small chance that one of the fans may be faulty.

Edit: By "off", I mean that fault code 02 will go away when the reading falls below that value. The "on" values are what triggers the fault code.

Edited by Coulomb
Link to comment
Share on other sites

4 hours ago, Coulomb said:

It's probably:

Inverter heatsink: 85°C on, 65°C off

Battery heatsink: 75°C on, 55°C off

Unless your fans are locked (warning code 1), in which case they become:

Inverter heatsink: 80°C on, 60°C off

Battery heatsink: 70°C on, 50°C off

Those are from Axpert Max 8 kW firmware version 90.06.

It's likely difficult to get the separate temperature measurements, though the undocumented Q1 command does respond with the required readings. Alas, the Q1 command is not documented, and the reverse engineering I did for some MKS models does not apply fully to the Maxs. There is also the hassle of getting the Q1 command through the display. It's perhaps best to just assume that your problem is the battery heatsink, as it has the lower temperature limit.

Just the obvious things: make sure that the fans are indeed working, clean out any excess dust. Ensure that the inverter has adequate ventilation and is not positioned where it will get direct sunlight. There is a small chance that one of the fans may be faulty.

Edit: By "off", I mean that fault code 02 will go away when the reading falls below that value. The "on" values are what triggers the fault code.

Ok thanks for the help. The fans are working. What I detected is the intake vents clogged. It has a filter and it was clogged. Better take them off? Why does the fresh air enter on top? It would be the other way around. Fresh air would enter at the bottom and hot exit at top. Hot air goes up always. Any body tried inverting the fans? Is the filters necessary? 

Link to comment
Share on other sites

1 hour ago, Gilberto said:

Ok thanks for the help. The fans are working. What I detected is the intake vents clogged. It has a filter and it was clogged. Better take them off? Why does the fresh air enter on top? It would be the other way around. Fresh air would enter at the bottom and hot exit at top. Hot air goes up always. Any body tried inverting the fans? Is the filters necessary? 

A question I have had for quite some time. With normal convection hot air rises. But it you force it with 2 fans does it really matter that you force it against the normal convection direction ? 

Link to comment
Share on other sites

10 minutes ago, Scorp007 said:

A question I have had for quite some time. With normal convection hot air rises. But it you force it with 2 fans does it really matter that you force it against the normal convection direction ? 

I think the way the inverter is picking hot air because hot air is on top. If it’s exhausting hot air on the bottom it raises and enters the inverter again on the top intake. This way we are fighting physics I think

Link to comment
Share on other sites

30 minutes ago, Superfly said:

Yep convection is a weak force however I have built many computer cases and never exhaust down - I have employed the same principles  mentioned in this video in my inverters as well.. intake at the bottom and exhaust at the top with positive case pressure.

 

 

So u changed the the direction of the fans on the inverter? 

Link to comment
Share on other sites

22 minutes ago, Superfly said:

Yes, I also added two fans at the top - however I decided to lower the power of the fans - so each is 0.25Ax2 per fan header - the stock fans are 0.6A - wasn't sure of the current carrying capacity of the headers..

 

Ok thanks. Tomorrow I will try without the filters. Then I will see what to do after that

Link to comment
Share on other sites

Some of our inventions do not always work as much as we think if the results are measured. 

Many posts indicated the lower noise if the bottom grille is removed. On my Axpert a sound APP does not measure any change with or without grille. 

Not sure what is wrong with my Axpert. 

Perhaps like comparing beans and cabbage🤔tomatoes is much nicer😀

Link to comment
Share on other sites

I also have a Axpert max 1. I removed the filters long time ago and manually open the inverter once a year and blow it out with a blower. Temps stays nice and low even in summer. Those filters slow the airflow down so much. I get they there for dust, but if the unit constantly over heats whats the point not going to last long in any case.

Inverter also runs much quieter as it does not need so much fans constantly running.

My fans are still the original fans still facing down. I was contemplating turning them around but just the filter delete made the inverter better.

My 2 cents. see image for temps the last 3 months.

Axpert Max 1 temps.jpg

Edited by Henry2501
Link to comment
Share on other sites

Something I have been wondering about wrt changing the fan direction is the location of the more sensitive/likely to fail components on the mainboard. Maybe @BritishRacingGreen can help out as you seem to be repairing quite a few of these axperts and I've been reading your and @Coulomb's posts about caps drying out and was wondering if the ones you see failing more often are at the top of the board or if location doesn't really matter? If the more sensitive components are towards the top of the mainboard then it would make sense to pull the fresh air in at the top rather than push warm air up over the lower components first. Just a thought.

Link to comment
Share on other sites

56 minutes ago, Henry2501 said:

I also have a Axpert max 1. I removed the filters long time ago and manually open the inverter once a year and blow it out with a blower. Temps stays nice and low even in summer. Those filters slow the airflow down so much. I get they there for dust, but if the unit constantly over heats whats the point not going to last long in any case.

Inverter also runs much quieter as it does not need so much fans constantly running.

My fans are still the original fans still facing down. I was contemplating turning them around but just the filter delete made the inverter better.

My 2 cents. see image for temps the last 3 months.

Axpert Max 1 temps.jpg

That is what o did yesterday. Seen better temperatures since the removal of the filters

Link to comment
Share on other sites

yes we have experienced this with modified inverter that we come across. Especially the axpert inverters. If you look at the bottom where the fans is you can see a lot of small parts components. I came across 2 inverters already where people turned the fans around and those small components eroded from the forced air on them. That also one of the reason i did not do the fan mod. Did not want to go in to this as some smart people here will probably say i am talking nonsense as electronics have a coating on to prevent erosion but thanks for bringing it up.

Link to comment
Share on other sites

Just remember please clean the inverter out often depends on how much dust you have. I wipe my side vents at least 2 or 3 times a month. When i walk in to the garage and see dust on them i clean it. Then also open the inverter once a year and blow off any extra dust inside out.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...