I am worried that the inverter housing (MultiPlus-II 48/5000/70-50 230v) heats up very much - you can barely hold your hand, I think it’s about 55 degrees Celsius (and 35 degrees indoors during the day).
But the internal fan of the inverter does not start. At the same time, everything works normally.
I fixed the T-sense sensor on the inverter to the negative contact of the 48 Volt power supply (on the inverter).
Is this correct?
35C is a very warm ambient temp.
Tsense is for temp compensated charging, as per the manual:
For temperature-compensated charging, the temperature sensor (supplied with the inverter/charger) can be connected. The sensor is isolated and must be fitted to the negative terminal of the battery.
So don’t connect it there, and it isn’t helpful for lithium batteries.
What load is on the inverter at the time?
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The inverter has its own internal sensor for starting the fan. The sensor is supposed to monitor the heatsink of the driving FETs.
But, on low load, the FET’s heatsink is not heating up so much.
Another source of heat is the big toroidal transformer.
I believe that the transformer is the main heat source in your case and up until the FET’s heatsink is warming up, by influence, it will be a while.
Not to mention that the placement of the transformer in the upper part of the inverter doesn’t help at influencing the FET’s heatsink, because of the natural convection. And generally, the fan is started over 50 deg.
Try to increase the load to 2-3kW and see if, after a while, the fan is starting.
Another way of testing the fan is, according with Victron service instructions, to disconnect the internal temperature sensor and in that moment the fan should start on full blow. That way you test both the sensor and the fan.
But this will imply opening the case which can be tricky for a non technical person.
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But the rechargeable battery (I have a PylonTech US3000c) has its own temperature sensor and we can see the change in battery temperature on a separate graph in the Cerbo GX shell).
Then where to connect the T-sense temperature sensor? And why is it, if temperature compensation for the PylonTech US3000c is provided without it?
I have no experience, so I am concerned about the high temperature of the inverter body during the inverting process. Although everything works fine.
You don’t need it for a pylontech…
You need to do more research and skill up.
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Thank you I will now know that the temperature readings for starting the fan are done by a separate internal sensor inside the inverter.
Thank you Now I know that a separate T-sense sensor is not necessary in my case. Thanks for the tip.
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I have a MultiPlus II GX 48/3000 and work with Pylontech batteries. Is it possible to use the T-sense sensor to independently measure and display a temperature and possibly process it further with node red?