October 13, 20232 yr hello, is there anyone who has already opened an Axpert max 2 or an equivalent and who has seen which circuit powers the fans? Is this the same circuit as the 12v output (which is given up to 100w)? I would like to replace it with a more powerful model so how many amps can I draw on the power supply? original it is a 12v 0.90A and I would like to put a delta TFB0812UHE 2.34A or similar. Thanks for your help.
October 13, 20232 yr 51 minutes ago, Br999 said: Is this the same circuit as the 12v output (which is given up to 100w)? I would like to replace it with a more powerful model so how many amps can I draw on the power supply? No, that power supply is an additional isolated user auxiliary power supply. Meant to be a 12V DC UPS to power a router, led lights etc. Although the system +12v power supply is beefier than the 5kW models the extra 1.5 amps per fan is stretching it, bearing in mind that there are up to 4 fans on the MAX range of machines. Theoretically you can power the new fan from the auxiliary 12V PSU as mentioned, but then you must tie its negative to the negative of the internal +12V supply, feed the fan +12V from the auxiliary PSU, and keep the 2 control signals as is (4 wire fan). BUT then you must NOT use the AUX PSU for anything else. If memory serves though, there are two isolated channels of auxiliary 12V. This is a bit messy, so far from ideal. And remember if you enjoying warranty, then it will become null and void. Have you tried to reverse the existing direction of fan flow already? , it makes for some improvement as it pushes hot air upwards, as nature intended! Edited October 13, 20232 yr by BritishRacingGreen
October 13, 20232 yr 9 minutes ago, BritishRacingGreen said: No, that power supply is an additional isolated user auxiliary power supply. Meant to be a 12V DC UPS to power a router, led lights etc. Although the system +12v power supply is beefier than the 5kW models the extra 1.5 amps per fan is stretching it, bearing in mind that there are up to 4 fans on the MAX range of machines. Theoretically you can power the new fan from the auxiliary 12V PSU as mentioned, but then you must tie its negative to the negative of the internal +12V supply, feed the fan +12V from the auxiliary PSU, and keep the 2 control signals as is (4 wire fan). BUT then you must NOT use the AUX PSU for anything else. If memory serves though, there are two isolated channels of auxiliary 12V. This is a bit messy, so far from ideal. And remember if you enjoying warranty, then it will become null and void. Have you tried to reverse the existing direction of fan flow already? , it makes for some improvement as it pushes hot air upwards, as nature intended! Or mount 2 x 2pin fans on the extraction filter grill on top sides of the machine and power then from aux psu supply. You will run the risk though to run your battery down if pv and grid are in short supply. Edited October 13, 20232 yr by BritishRacingGreen
October 13, 20232 yr Author no I have not tried to return the fans, I have already added 3 fans 120 mm above the inverter which pushes the air in with a substantial air filter because the original filters were getting clogged quickly. With this at 10 kW solar, I manage to stay below 55 degrees after several hours, but I would have liked to further improve the air flow. for the moment the device is under warranty I don't want to take it apart too much. on this model you can remove the top cover without touching the warranty label I also redid the connection cover at the bottom of the inverter so that the air comes out better. so to keep it reliable and simple, you should not try too hard to put a more powerful fan
October 13, 20232 yr Author Maybe staying under 60 degrees at 85% of power is good? what is a shame is that apparently there are 3 temperature probes in the inverter but we can only recover one value, that of the MPPT I believe...
October 13, 20232 yr 9 minutes ago, Br999 said: no I have not tried to return the fans, I have already added 3 fans 120 mm above the inverter which pushes the air in with a substantial air filter because the original filters were getting clogged quickly. With this at 10 kW solar, I manage to stay below 55 degrees after several hours, but I would have liked to further improve the air flow. for the moment the device is under warranty I don't want to take it apart too much. on this model you can remove the top cover without touching the warranty label I also redid the connection cover at the bottom of the inverter so that the air comes out better. so to keep it reliable and simple, you should not try too hard to put a more powerful fan 55 is way cool (no pun). The OG10 /MAX 10kw is notorious for running hot and thats no good. @Steve87 is testiment of this. Edited October 13, 20232 yr by BritishRacingGreen
October 13, 20232 yr 3 minutes ago, Br999 said: but we can only recover one value, that of the MPPT I believe... What you mean?
October 13, 20232 yr Author from what I saw in the inverter there are three temperature sensors, and on the serial output we only have one value, that of the mppt
October 13, 20232 yr 3 minutes ago, Br999 said: from what I saw in the inverter there are three temperature sensors, and on the serial output we only have one value, that of the mppt Ah ok, far as reading metrics is concerned, yes.
October 13, 20232 yr Author my goal would be to go below 50 degrees but I think that the three fans on top send so much air, that the air flow is limited by the three original 80 mm fans. this is why I wanted to put more powerful fans as said previously it would be possible to put an isolated power supply and connect the GND together as well as the PWM and TACH but I am a little afraid that the electronics of the inverter will not like not
October 13, 20232 yr 7 minutes ago, Br999 said: from what I saw in the inverter there are three temperature sensors, and on the serial output we only have one value, that of the mppt There are three NTC probes that are individually connected to the DSP controller, which infers the DSP read them individually in order to control the cooldown loop. The MPPT sensors are private to the MPPT controller.
October 13, 20232 yr 4 minutes ago, Br999 said: my goal would be to go below 50 degrees but I think that the three fans on top send so much air, that the air flow is limited by the three original 80 mm fans. this is why I wanted to put more powerful fans as said previously it would be possible to put an isolated power supply and connect the GND together as well as the PWM and TACH but I am a little afraid that the electronics of the inverter will not like not I am confident that the system +12V has got enough power budget to maybe accomodate one beefier fan, and if I must choose, I will start with the one blowing onto the IGBT heatsink cluster.
October 13, 20232 yr Author when I consume a lot on the 230 V part the temperature displayed remains relatively low, the same when I charge the battery the only time when the temperature soars is when there is sunshine, therefore the MPPT part. Is this the one you're talking about?
October 13, 20232 yr 15 minutes ago, Br999 said: when I consume a lot on the 230 V part the temperature displayed remains relatively low, the same when I charge the battery the only time when the temperature soars is when there is sunshine, therefore the MPPT part. Is this the one you're talking about? I was reffering to the leftmost heatsink on the mainboard , as shown below : That heat sink has no less 17 large IGBT's covering the DC-DC converter , the DC-AC converter and the charge buck converter. Because the PV is high voltage version , the PV connection is also done on this bus. I don't know much about the MPPT's , other than its dual , it looks after itself regarding temperature/fan control etc. I dont even know if MPTT temperature is relayed to the main board at all. Maybe @Coulomb can shed some light here.
October 13, 20232 yr Just now, BritishRacingGreen said: I was reffering to the leftmost heatsink on the mainboard , as shown below : That heat sink has no less 17 large IGBT's covering the DC-DC converter , the DC-AC converter and the charge buck converter. Because the PV is high voltage version , the PV connection is also done on this bus. I don't know much about the MPPT's , other than its dual , it looks after itself regarding temperature/fan control etc. I dont even know if MPTT temperature is relayed to the main board at all. Maybe @Coulomb can shed some light here. There are also two NTC probes wired onto this heat sink , so its thermal issues matters considerably to the DSP .
October 13, 20232 yr Author Not really, 8s on both sides around 230Vdc but two strings in parallel on 1 and three strings on 2. why ?
October 13, 20232 yr 7 minutes ago, Br999 said: Not really, 8s on both sides around 230Vdc but two strings in parallel on 1 and three strings on 2. why ? that's ok , you are sharing . Have you noticed at all that during sunny hours that the MPPT fan/s are running while the main board fans are not ? Are the MPPT's benefitting from the your external blower on top ?. Remember the MPPT's has its own airflow ducting.
October 13, 20232 yr Author yes when there is sun all the fans turn well. from above you can clearly see all the electronics, all components benefit from ventilation, the three fans run at full speed as soon as the temperature exceeds 40 degrees or there are more than 2000 solar watts, or 30A current batterie. there is air coming out through all the holes of the inverter these three fans send 3 cubic meters hour each, under the inverter the outlet is a real hand dryer!! The component that heats up the most is the MPPT card even though the integrated fan is running at full speed. hence why I would like to put a more powerful model I will study the solution of an external power supply and sending the signals back to the motherboard
October 13, 20232 yr 6 minutes ago, Br999 said: yes when there is sun all the fans turn well. from above you can clearly see all the electronics, all components benefit from ventilation, the three fans run at full speed as soon as the temperature exceeds 40 degrees or there are more than 2000 solar watts, or 30A current batterie. there is air coming out through all the holes of the inverter these three fans send 3 cubic meters hour each, under the inverter the outlet is a real hand dryer!! The component that heats up the most is the MPPT card even though the integrated fan is running at full speed. hence why I would like to put a more powerful model I will study the solution of an external power supply and sending the signals back to the motherboard Ok give us some feedback on your progress, there a number of OG10 owners out there in the wild that have this problem. Hence my interest. Edited October 13, 20232 yr by BritishRacingGreen
October 13, 20232 yr Author Ok, if I do it I'll leave a message, it's not too urgent as winter arrives it might heat up less!
October 14, 20232 yr 17 hours ago, Br999 said: what is a shame is that apparently there are 3 temperature probes in the inverter but we can only recover one value, that of the MPPT I believe... There are usually 4: MPPT, battery heatsink, AC heatsink, and transformer. The headline temperature reading is the maximum of all these. You can probably get the four temperatures if you really want to; I have them on my monitoring software. For me, the data is in the undocumented Q1 command, but alas, since it's undocumented, they can and do vary the data format from version to version. Yes, it's irritating.
October 14, 20232 yr Author given that I use solar assistant I do not have direct access to the serial connection if the temperature displayed is the maximum temperature of the components we will say that it suits me, but I would have liked to have all the temperatures
October 14, 20232 yr Author otherwise while waiting for me to modify the original fans here is what I did by removing and replacing the upper cover and the disconnection cover which allows me not to touch the warranty label. I made two different filter sizes I made the parts in 3D printing I have the files if anyone is interested with this system in a room at 25 degrees at 10 kW of solar power I keep the inverter below 55°c and it remains less noisy than the original fans Edited October 14, 20232 yr by Br999
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