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just-chillin avatar image
just-chillin asked

MPPT 1224-40 Temperature Sensor

The thermistor(?) on the BTS probe of my MPPT 1224-40 charge controller has broken off.

It was connected to the controller via an RJ45 connector. On each tails of the encapsulated thermistor there was a resistor soldered in series: one is 10k and the other is 76k.

I have a replacement sensor (genuine victron Im advised) that has the following characteristics : 96k at -20C (freezer), 10k at 20C (room temperature) & 1k at 100C (boiling water). Would this be a suibale sensor to solder in series with the existing resistors please?

Alternatively, can anyone advise the resistance characteristics of the BTS probe please?


Many thanks in advance

Temperature Sensor
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2 Answers
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

What is a MPPT 1224-40?

Do you mean a Orion 12/24? But there is no Orion with 12/24 and 40A!?
And also the neither the MPPT nor the Orion have a T-sense...
Or the BlueSolar PWM? But there is also no model with 40A.

Can you make a picture of the device?

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JohnC avatar image JohnC ♦ commented ·

Maybe this? https://www.victronenergy.com/upload/documents/Manual-BlueSolar-MPPT-Charge-Controller-12V-24V-40A-EN_FR_DE_ES.pdf


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Matthias Lange - DE avatar image Matthias Lange - DE ♦ JohnC ♦ commented ·

Yes, after a bit of google I also found this device.

This old manual has a terrible translation into German. :D

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just-chillin avatar image just-chillin Matthias Lange - DE ♦ commented ·

Thanks to all for making the effort to respond.

Apart from getting info off google which I am (and have been able) to do myself is there no way of getting technical input from Victron themselves eg original technical design specification documentation?

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just-chillin avatar image
just-chillin answered ·

Pictures as requested



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Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·

Oh, you have a very old device.
The T-sense is not necessary for the MPPT to work.
It is optional to optimize the charging at high/low temperatures.

It looks more like RJ12 not RJ45.

Sorry but I don't know what you can use as a replacement.

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Victron temperature sensor disambiguation table - which product supports which sensor