Redarc D+ for Lithium Battery Charging

[Furgoavispa]

Possibly.....

It would have to be an isolator switch beefy enough to deal with the max current..... but some dc-dc charger dont like having the battery disconnected, possible internal damage and faults stored.....

It's much better to run dc-dc chargers with an ignition/run feed that can easily be switched off. (A simple in line low current switch will suffice)

Hello from Spain and excuse me for my bad english

I bought a Redarc 1240D from Travelvolts (thanks Martyn) and I tried to switch off the blue cable (ignition feed) in order to stop charging my Fraron 100 ah lifepo4 battery when freezing and it does not works.

Without the ignición wire switched, the redarc just works charging the leisure battery when it detects over 13,2 V in the main batt and stops below 12,8 V

How can I switch off the redarc when freezing?

Thanks

 

[Dellmassive]

Hello from Spain and excuse me for my bad english

I bought a Redarc 1240D from Travelvolts (thanks Martyn) and I tried to switch off the blue cable (ignition feed) in order to stop charging my Fraron 100 ah lifepo4 battery when freezing and it does not works.

Without the ignición wire switched, the redarc just works charging the leisure battery when it detects over 13,2 V in the main batt and stops below 12,8 V

How can I switch off the redarc when freezing?

Thanks

Have you got solar connected? - solar charging is 24/7?

what do the LED status show? what profile? what charge mode? (can you photo?)


green and orange wire like this for LI Profile:



**************
Blue wire like this for Smart alternator mode.



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maybe try this reset:



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https://www.redarc.com.au/Content/Images/uploaded/Manuals/BCDC Dual Input Instruction Manual.pdf

Dual Input 40A In-vehicle DC Battery Charger

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appart from the above . . . . . .

I've not fitted my 1250D yet im still testing the Victron 12/12/30,

so in the meantime lets see if @travelvolts (travelvolts) and @Dave Hallford-Nye (technical sales manager for the exclusive UK and Ireland distributor for Redarc) has any ideas?


So the main question @Dave Hallford-Nye is that what sets the mode in the 1240D/1250D for standard/low voltr mode, and is it a one time setting at install? or a constant thing?

and why is his 1240D changing to standard mode after he has removed the ignition feed (should be LV mode)

its not something i have tested as yet (but will be soon)


so he want the 1240D totally shut down when the +12v ignition feed on the blue wire is removed.

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[Furgoavispa]

Yes, I have an Anderson connect for a Renogy portable 100 w panel. (yellow cable + ground) It works properly.

The DC/DC charger and the battery are installed under the driver (left) seat of my California Beach MY2018. Lithium profile is selected (green+ Orange wire) and also connected to an optional led.

I installed a Victron BMV712 battery monitor in order to use the themperature relay to open the circuit when freezing (blue wire) but it did not work at all , the Redarc seems to be in Standard Mode input when the circuit of the blue wire is open.
I do not know how to switch off the DC/DC charger automaticaly or even manual when freezing or when I wanna do

With the Van stopped for a couple if seems, if I try to charge the main battery with a EHU, when the battery reachs about 13,2 volts the redarc start to charge the leisure battery too.

I have this photo of my installation.

Thank you Dell.

 

[Dellmassive]

Yes, I have an Anderson connect for a Renogy portable 100 w panel. (yellow cable + ground) It works properly.

The DC/DC charger and the battery are installed under the driver (left) seat of my California Beach MY2018. Lithium profile is selected (green+ Orange wire) and also connected to an optional led.

I installed a Victron BMV712 battery monitor in order to use the themperature relay to open the circuit when freezing (blue wire) but it did not work at all , the Redarc seems to be in Standard Mode input when the circuit of the blue wire is open.
I do not know how to switch off the DC/DC charger automaticaly or even manual when freezing or when I wanna do

With the Van stopped for a couple if seems, if I try to charge the main battery with a EHU, when the battery reachs about 13,2 volts the redarc start to charge the leisure battery too.

I have this photo of my installation.

Thank you Dell.

View attachment 54508

I've had a reply from Redarc tech support.

See below...

××××××××××××××××××

Thank you for the enquiry.



The reason the BCDC is not turning off will be due to alternator still producing a voltage above 13.2v. Even without power to the blue IGN wire, if the input voltage (red wire) is above 13.2 the BCDC will still actively charge.



The solution is to use a ignition triggered relay (can also wire to a switch) to disconnect the RED wire on the BCDC. This will guarantee the input is disconnected and the BCDC will stop charging. If you go down this path, please use a relay that can handle the max current the BCDC can draw from the starting battery (I recommend a 60 amp relay for the BCDC1240D). A kit like THIS would work well, but you can source any suitable relay.



I hope this helps , please let me know if you have any other questions.



Best regards,

××××××××××××××××××



So looks like they are recommended that you use the BMV712 low temp output to control a 60amp relay to shunt the dc-dc main starter feed on/off. (For low temp disconect of your lifepo4.. LTD)

 

[Furgoavispa]

Thank you so much @Dellmasive.

I think I will section the red cable with a manual switch to avoid charging whenever I want.

Can you tell me if it is convenient to do it before or after the fuse, or if it is necessary to add another fuse after the switch?

My lithium battery (Fraron 100ah) already brings protection LTD to avoid charging below 0ºC and LVD below 10.5 volts, but I remain calmer if I can also manually section it.
As a counterpart I understand that it will consume from 8 to 100 mA of the leisure battery when it is switched off.
See picture below

Even with the charger disconnected, the leisure battery will receive some charge through the circuit of the auxiliary elements powered when the engine is on. I don't know how much intensity and if it will be dangerous for a frozen battery.

 

[Dellmassive]

I'd put the switch after the fuse. (On the red supply cable to the dc-dc)

Make sure the switch is 60A or higher rated.....

Maybe one like this.....