Lithium battery NTC

[Bigjay1968]

In the next couple of weeks I’m changing over to a Roamer seatbase 230ah battery, now the charger and solar controller is straight forward to swap to a lithium profile. But what I am struggling with is where to get a NTC sensor to go from the B2B charger to the battery, its a plug in type “molex jnr”. I can’t see one any where, especially as I need about 2m in length. Question is, is it fool hardy to rely on the batteries BMS to control over/under temp charging?

 

[Lenny HB]

BMS should be the last resort as it cuts the charging at 0° much better to have a sensor with charging cut off at 4° or 5°.
What B2B is it?
I think the sensor is only a thermistor if you could find the spec it would be easy to make one up.

 

[Bigjay1968]

BMS should be the last resort as it cuts the charging at 0° much better to have a sensor with charging cut off at 4° or 5°.
What B2B is it?
I think the sensor is only a thermistor if you could find the spec it would be easy to make one up.

Lenny, its a NE325 nordelettronica B2B.

 

[Two on Tour]

The best thing to do is not to let your lithium battery get to a temperature low enough that you want to stop it from being charged, which is why I have our lithium battery on a temperature controlled heat mat.
When our battery temperature gets down to 7° the heat mat switches on.

 

[cyberyacht]

As the B2B only operates whilst driving, do you drive in overcoat, fur gloves and balaclava and visit northern Norway in December? I would imagine your battery isn't likely to be below 5C while you are in it. Possibly only while parked and then your Solar Controller is doing its thing and should be set for the cutoff.

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[Bigjay1968]

As the B2B only operates whilst driving, do you drive in overcoat, fur gloves and balaclava and visit northern Norway in December? I would imagine your battery isn't likely to be below 5C while you are in it. Possibly only while parked and then your Controller should be set for the cutoff.

The B2B is also the charger for when on hookup, so potentially it could quite possibly be on whilst I’m outside in my overcoat, fur gloves and balaclava

 

[Lenny HB]

Lenny, its a NE325 nordelettronica B2B.

Didn't know they made them so I won't be any help.

 

[Bigjay1968]

The best thing to do is not to let your lithium battery get to a temperature low enough that you want to stop it from being charged, which is why I have our lithium battery on a temperature controlled heat mat.
When our battery temperature gets down to 7° the heat mat switches on.

Didn’t realise there was such a thing! Would this be preferable over a temp sensor or in combination with?

 

[cyberyacht]

The B2B is also the charger for when on hookup, so potentially it could quite possibly be on whilst I’m outside in my overcoat, fur gloves and balaclava

You don't bring the temperature inside your van down to match the outside do you? Surely, it's only likely to be a problem while in storage in a very cold environment.

 

[Bigjay1968]

You don't bring the temperature inside your van down to match the outside do you? Surely, it's only likely to be a problem while in storage in a very cold environment.

Do you think I wouldn’t need a temp sensor? I take it the sensor is only there to stop charging at low temps to avoid damage to the battery?

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[Two on Tour]

Didn’t realise there was such a thing! Would this be preferable over a temp sensor or in combination with?

This is the 12v heating film that I used, although mine is 200mm wide and its hooked up to an Inkbird digital temperature controller.

https://infrarot-fussboden.de/12V-HeatingFilm-14cm-wide-110W

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[Bigjay1968]

This is the 12v heating film that I used, although mine is 200mm wide and its hooked up to an Inkbird digital temperature controller.

https://infrarot-fussboden.de/12V-HeatingFilm-14cm-wide-110W

Inkbird 12V Digital Temperature Controller ITC-1000 Heater Cooler 2 Relays Brew | eBay

Find many great new & used options and get the best deals for Inkbird 12V Digital Temperature Controller ITC-1000 Heater Cooler 2 Relays Brew at the best online prices at eBay! Free delivery for many products.

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Interesting, thanks for the info

 

[cyberyacht]

Do you think I wouldn’t need a temp sensor? I take it the sensor is only there to stop charging at low temps to avoid damage to the battery?

Desirable but the original query was whether one should rely on the BMS. The likelihood of the temperatures dropping that low was the point I was making. I'd be happy to rely on the BMS but then I live in the south of England.

 

[Two on Tour]

Lenny, its a NE325 nordelettronica B2B.

How are you using your NE325 on EHU as the NE325 is only a 12v DC to DC B2B with no 240v input according to the spec sheet on it?, plus I would imagine the B2B's temperature protection is only to sense the battery over heating, not getting too cold as I can see no way of adjusting the temperature settings for the unit.

 

[Bigjay1968]

How are you using your NE325 on EHU as the NE325 is only a 12v DC to DC B2B with no 240v input according to the spec sheet on it?, plus I would imagine the B2B's temperature protection is only to sense the battery over heating, not getting too cold as I can see no way of adjusting the temperature settings for the unit.

Your correct, schoolboy error……….. was looking at the manual and it said “ if you are using the DC/DC converter to charge the services battery…..” I immediately thought, I have a dc/dc so it must be charging the battery lol.

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[Scotch mist]

This is the 12v heating film that I used, although mine is 200mm wide and its hooked up to an Inkbird digital temperature controller.

https://infrarot-fussboden.de/12V-HeatingFilm-14cm-wide-110W

Inkbird 12V Digital Temperature Controller ITC-1000 Heater Cooler 2 Relays Brew | eBay

Find many great new & used options and get the best deals for Inkbird 12V Digital Temperature Controller ITC-1000 Heater Cooler 2 Relays Brew at the best online prices at eBay! Free delivery for many products.

www.ebay.co.uk

got one as well but half the price

Temperature Controller Thermostat LCD Digital with Sensor STC-1000 12V/110-220V | eBay

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[Two on Tour]

got one as well but half the price

Temperature Controller Thermostat LCD Digital with Sensor STC-1000 12V/110-220V | eBay

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So have I and they are half the quality of the Inkbird and very tacky and I personally would not leave one switched on unattended in our motorhome, hence, why I did not point the OP in it's direction.

 

[Scotch mist]

each to their own but I would have said same unit just different branding , same as many Chinese offerings

 

[Two on Tour]

each to their own but I would have said same unit just different branding , same as many Chinese offerings

You obviously have not had the two items side by side as I have.

I already had four Inkbird controllers for our fridge fans and tank heaters and when I went to put together the heat mat for our lithium battery but there was no stock of the Inkbirds in the country at the time so I bought a STC-1000 of which none are branded and are knock off's of the ITC-1000F.
I opened up the casing of STC-1000 when it arrived and decided that it was worth the wait and I ordered an Inkbird direct from China, but as you say, each to their own.

 

[Scotch mist]

I’ve had 3 now , never a problem but I hear ya

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[autorouter]

But what I am struggling with is where to get a NTC sensor to go from the B2B charger to the battery, its a plug in type “molex jnr”. I can’t see one any where, especially as I need about 2m in length

Have you tried Delta Conversions? They do Nordelettronica units, repairs and accessories. I couldn't see one on their site, but I'm sure they could make one up and supply it. Or at least sell you the bits to make one up, including the connector.

 

[Bigjay1968]

Have you tried Delta Conversions? They do Nordelettronica units, repairs and accessories. I couldn't see one on their site, but I'm sure they could make one up and supply it. Or at least sell you the bits to make one up, including the connector.

Thanks, I’ll give them a call and see what they recommend

 

[Jimbohorlicks]

My Ecotree 100 ah lithium has Bluetooth and a heat pad incorporated into the battery.
Its not been cold enough to try it out yet but the Bluetooth app shows SOC ,charge/ discharge amps , temperature. and individual cell voltage.,which is all I need at the moment without any costly add ons
Check with your intended supplier to see if they have anything similar that's also an underseat battery.