Br999

Hello everyone, I have an Axpert MAX II 11K Twin, and with the return of autumn I reconfigured my inverter to increase the charging power to take advantage of the slightest ray of sunshine. I set it to 150A (I know it's a lot and it would be better to stay lower). In the spring when I set 150A my smartshunt indicated 143A (we are already far from 150A), but now I no longer exceed 139A on the smartshunt, yet the inverter still displays 150A. What could be the cause of this drop? Is there a way to adjust/calibrate the current? The inverter remains below 50°C at 10.8Kw of power. Thank you for any help or information on this subject.

My inveter have firmware u1 75.00 and u2 39.04, apparently not compatible

So I would have to ask the seller for the firmware version before buying it(if I decide to buy one). I never found the firmware download or update anywhere for the Axpert MAX 2 11K TWIN...

I manage to limit the temperature to 48°C, with improved cooling at an mppt power of 10.8kW (8kW battery charge and 2600W for the AC water heater) but perhaps other components which are not monitored heat up more. It might be better to mount a second inverter in parallel. Besides on this subject is it possible to put the same model but which will possibly have another firmware in parallel? I bought mine a year and a half ago, no guarantee that the model being sold is exactly the same?

I have an adc7480/72/E 3200W battery charger but the output voltage is adjustable to 55.2 volts.I already have this charger

anyone else to give me their opinion on this possibility?

Yes, I want to activate the second charger when consumption is low and the sunshine is strong. At this moment I only use 8kW (max power of the inverter charger) of solar power while the mppt/inverter/photovoltage panels can 11Kw. the second charger will be connected to the AC output of the inverter, to reach a total of 11000 W = house consumption (300W) + battery charge ((140+42A) X55.2V). so it would be possible to recharge the batteries of the inverter with a charger powered by the 230v produced by the inverter itself? no risk of returns? I don't really know the internal topology of this type of inverter the goal is not to use the battery to recharge the battery, I understand that this is not possible and useless, but to use the power not to use mppt (around 2.5kw) during full sun, to charge more via the AC output of the inverter.

Hello, I have an Axpert Max 2 11Kw TWIN, and I would like to increase this battery charging capacity (if possible). This is limited to 150A (rather 141A really), around 8kW, and in certain conditions my home only consumes 300W while solar production can reach the maximum, i.e. 11kW. there is therefore a loss of energy. I have an adc7480/72/E 3200W battery charger and I would like to add it as a backup charger using the AC output of the inverter. I know this is not the ideal setup but can it work without problem? I checked the insulation of the inputs/outputs of this charger, and apparently it is indeed an isolated model. As this charger is limited to 42 amps, I will program it so that it turns on when the battery load of the inverter exceeds 100 amps and that it turns off when the battery load drops below 50 amps. At full power with low consumption in my home I could charge the battery up to 180 amps. In your opinion, is an assembly of this type risky for the inverter? In the inverter manual it is clearly indicated that it is not isolated, but if the charger is isolated this should not pose a problem?

Hello, has anyone had this problem or anything similar to it? when the battery charge reaches its maximum and the AC load is close to zero, intabilities appear on an mppt, the one where the voltage is the highest? I tried to invert the inputs, the problem is the same, the input where the voltage is the highest fluctuates arrived at 150A battery charge when I have time ans sun I will try in 8s on both mppt but there is work to change all that. no idea ? thank you

yes but I find that they were wide with the derating, for a 500v voc and 450v mppt inverter, from 360v PV the battery charge goes from 150 to 90a! 60%! It's a bit of an abuse because it's not written anywhere in the manual!

the mppt goes up to 450v, and in 10s I do not exceed 375v I think the safety margin is sufficient, right?

Hello, today a beautiful sunny day, and new problems appear! When the AC load is low, and the PV power is high, the battery charge fluctuates. We see it on the graph I "play" with the water heater, when it is on, the pv power is stable, and as soon as I turn off the water heater the battery current drops then rises to 150A, then falls again then rises again... The problem is visible on mppt 2 the voltage drops to 150v. I just changed from 3p8s + 3p8s to 4p8s + 2p10s. I don't know if the problem arose before because it's been a long time since there was a strong sun Or maybe in 10s the power derating is already effective? I know that if I exceed 360 volts the charge no longer exceeds 90 amps Can too little AC consumption pose a problem? last summer the problem did not arise I always consumed more because of the pool pump which worked all day thanks for any help

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

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

Ok, if I do it I'll leave a message, it's not too urgent as winter arrives it might heat up less!

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

Not really, 8s on both sides around 230Vdc but two strings in parallel on 1 and three strings on 2. why ?

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?

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

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

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...

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

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.

Hello everyone, I have an Axpert Max 2 11k Twin with firmware u1 75.00 and u2 39.04. Has anyone seen/found these firmware? Thanks!

Apparently 12 panels in series are too many for this inverter, despite the mppt which is given up to 450vdc. Already at 360Vdc, a recharge limitation occurs (max 90A instead of 150A). I don't know if this is a "firmware bug" limitation or a real hardware limitation to prevent damage. I don't understand why this happens, so I don't know how to avoid this problem except by changing the photovoltaic field from 2px12s to 3px8s. Does anyone have a limitation of this kind on Voltronics equipment, when used in High Voltage mppt and high charging current?