Propex heater sensing high voltage

[markmoto]

Good evening,

New battery to battery split chargers for smart alternators usually push 15 to 15.3v to AGM batteries as results Propex heater sensing high voltage even in a switched off position.
Is there any work around ?
Thanks

 

[Campervan_man]

ebay sell 12V voltage regulators that regulate the voltage. Similar to voltage regulators protecting satellite systems.

 

[markmoto]

Anyone might be interested I have contacted Propex and they replied back:

...Heaters manufactured from the beginning of this year (2020) have a revised compliant PCB which has modification, one of which is the increased high voltage cut-out setting to 17v.....

ebay sell 12V voltage regulators that regulate the voltage. Similar to voltage regulators protecting satellite systems.

Thanks, really helpful, purchased one already : )

 

[Campervan_man]

The voltage regulators can become warm to hot over time so be careful not to put anything close to it and a mini air vent will help to keep cool.

 

[Pausim]

If you have a smart alternator I would suggest a Battery to Battery Charger. Not only is there the possibility of high voltage issues but the alternator charging will shut down as soon as the engine battery is fully charged, even though the leisure battery is usually still hungry. My last motorhome had a smart alternator and the engine charging of the leisure battery improved a lot after I fitted a B2B.

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[St3v3]

15V seems really high to be sending to the batteries, I don't think that'll do any good! I agree with above about getting a proper B2B charger. It'll do the proper staged charging to look after the batteries properly.

 

[jezport]

Highest Duracell advised me for their AGMs was 14.8v

 

[Pausim]

Highest Duracell advised me for their AGMs was 14.8v

And the Bunny knows best! The more I hear about AGM batteries the more difficult they seem to be to look after. Volts too low they sulphate. Volts too high also damaging. Too short a charging cycle bad.

It seems to me that many manufacturers and customers have got left behind by advances in battery technology. We the customers demand more and more from our electrical systems and are now offered high performance batteries (AGM, Gel, LiFePO4 etc.) that can meet these demands. However high performance comes with special charging needs and simple chargers and incidental engine charging doesn’t cut it. The battery manufactures no doubt base their performance figures on very exact charging. Meanwhile many battery salespersons quote these performance figures without mentioning, or perhaps even understanding, how these figures are achieved.

There seems to be a lot to learn and the experience of other Funsters has been very helpful to me. Thanks folks!