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Thermistor Question
#1
I refreshed 3 Akkupacks for my cargobike so far.
On the last one I seem to have a broken thermistor.
At least it works with one of another pack.
What value should I use to get a new one. Are there any standard values used? I can not read anything on the old one.
I did try to measure it, but my ohm meter does not give me a value.

Thanx for your input.

Andy
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#2
Use the ohm meter to measure the resistance of the good thermistor from the other pack ;-)

Also, there are 2 types of thermistors: NTC (negative temperature coefficient) and PTC (positive).
With NTC, the resistance lowers as the temperature goes up.
With PTC, the resistance goes up with the temperature.

NTC 10kΩ and 100kΩ are probably the most commonly used ones, but it could be anything. Best to measure and make sure.
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Modular PowerShelf using 3D printed packs.  60kWh and growing.
https://secondlifestorage.com/showthread.php?tid=6458
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#3
Thanks for your replay.
Now I got it measured. Lookes that my probes are to thick. So I didnt get a value the first time Sad
Resistance is 120k Ohm.

Andy
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#4
Is it about 21C / 70F? Then it's most certainly a 100k NTC thermistor, such as this one:
http://www.bapihvac.com/wp-content/uploa...r_100K.pdf

You probably don't need super accuracy in this case, so you can replace it with pretty much any NTC 100k thermistor you can get your hands on.
Modular PowerShelf using 3D printed packs.  60kWh and growing.
https://secondlifestorage.com/showthread.php?tid=6458
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#5
Yes. It was around 21°C.
Thanks for your help.

Andy
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