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HOW TO: Check your Zamp Battery Temperature Sensor for proper operation


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This is only for those with Solar; the Zamp controller uses a remote sensor attached to a battery terminal to determine the temperature so that it can decide how much current it should allow. You will need a digital volt/ ohm meter, a cup of hot water and a cup of ice water. The probe should be waterproof, but just in case, only submerge it so that the ring is under water.

I removed mine during a (major, in progress) battery cable mod - the factory had cut the probe cable and crudely spliced it back together, then covered it with sticky tape ;( I wanted to see if the sensor checked out before reattaching it again correctly. You can also go behind your controller in the cabin and unhook the two wires and test from there, but in any case you will need to remove the sensor from wherever it is attached. If you test from inside you will need a helper outside. Here is what mine looked like:

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Zamp does not publish any specifications for this device, nor do they tell you exactly where to install it. An Amazon reviewer replaced his with a new defective one that was shorted out, and it fried his controller....! I suspect he installed it on a positive terminal. If the sensor is installed on a NEGATIVE terminal, and it shorts out, it will not apply power to the wrong components, it will just quit working. Or alternatively you can install it on the side of one of the battery cases using tape.

Zamp probe at Amazon

Using a digital voltmeter, check each wire (red and black) one at a time to see if they are isolated from the mounting ring- the meter should read infinity (open circuit). A shorted probe should be replaced, it will not function.

Next check the resistance between the pair of wires. This value changes with temperature. There may be a chart somewhere but it isn’t really needed. Mine read 13.7 Kilo ohms (13,700 ohms) when the garage temperature was 55 degrees F.
 

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Carefully lower the probe into hot water. I used tap water at about 130 degrees F. After a minute or so it stabilized and the meter read 4.6 K ohms.

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Lower it into ice water, the meter read 28.8 K ohms.

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I hope this helps, I have not seen this discussed anywhere. If somebody finds an official Zamp temperature/ resistance chart for this probe, please let me know so I can add this information.

John Davies

Spokane WA

Edited by John E Davies

"Mouse":  2017 Legacy Elite II NARV (Not An RV) Two Beds, Hull Number 218, See my HOW TO threads: https://olivertraveltrailers.com/topic/john-e-davies-how-to-threads-and-tech-articles-links/

Tow Vehicle: 2013 Land Cruiser 200, 33" LT tires, airbags.

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What temperature value does the Zamp controller display during the test?

Mossey

Edited by mossemi
Typo

Mike and Krunch   Lutz, FL   LEII #193 “the dog house”

 

 

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Posted (edited)

It didn’t display anything because it was not connected. My 12 volt electrical system is in pieces, literally and completely.  Here is what it will hopefully look like. This is just a foam mockup.
 

89EC4D6F-B1F6-47E7-8F6B-C7BEBE2460F3.thumb.jpeg.28278ad90c9a29d12c1cec5398c516f8.jpeg
 

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I don’t recall ever seeing a temperature displayed, so either mine is/ was dysfunctional or I was just too dumb to find the right button. I mostly leave it set on Amps. Is there a Menu option that must be selected for it to show battery temperature? Should I read the FM? pardon my foul acronym language.....

I will be sure to check it out when I can put power back on the trailer, which may be Tuesday. I am still waiting on parts.

John Davies

Spokane WA

 

 

 

Edited by John E Davies

"Mouse":  2017 Legacy Elite II NARV (Not An RV) Two Beds, Hull Number 218, See my HOW TO threads: https://olivertraveltrailers.com/topic/john-e-davies-how-to-threads-and-tech-articles-links/

Tow Vehicle: 2013 Land Cruiser 200, 33" LT tires, airbags.

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From the Zamp manual.

The mock up looks clean.

Mossey

261BB428-E690-4D68-8FBC-92EEDA6C0E24.thumb.jpeg.b056d9717b20752e232d59f77165ae3a.jpeg

Edited by mossemi
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Mike and Krunch   Lutz, FL   LEII #193 “the dog house”

 

 

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