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Victron Orion Smart Charger Low Temp Cut Off

NWC100

New Member
Joined
Oct 29, 2022
Messages
16
Hi all
In my van I have the below setup.
24v 100ah lifepo4
Smart solar 100/15
BMV712
2x Battery sense (van & house)
Orion Smart charger 12/24 10
MPP clone 24/3000

It's not super cold where I live but often drops to 0c overnight, this forces the solar charge not to work in the mornings as cutoff is set at 6c, problem is that if I use the van in the mornings the dc/dc charger will start up and push the nearly 10a straight to battery, it appears to not use the low temp cutoff provided by the battery sense to the shunt like the solar charge does.

Did I miss something in the settings, is this the way it's supposed to operate, any way to work around this?

Is this 10a going to damage the battery if it's charging with the battery between 0c and 6c?

Thanks in advance for any advice you may have

Nick
 
Did I miss something in the settings, is this the way it's supposed to operate, any way to work around this?
The Orion charger does not communicate over the ve buss and there is no low temperature disable. What you can do is use an external mechanical thermostat with the H or L control pins on the Orion.
Screenshot_20250126-100822_OneDrive~2.jpg
 
Potentially useful for someone else; the new Orion XS charger does support low temp cutoff. From the manual:

"Low temperature cut-off (configurable for lithium batteries)
Note that this setting only takes effect when the battery temperature is
shared by other devices, for example, by a BMV-712 or SmartShunt in
a VE.Smart network. This setting is not effective if a BMS controls the
charger."
 
You certainly don't want to be charging below 32°F. As the temperature approaches 32°F the charge amps should be decreased until you have zero charge amps at 32°F.

Where do you have the BMV-712 temperature probe located? Picture?

Batteries are quite dense and hold heat. If you insulate them they'll hold the heat even better. I use a warming system to keep the battery temperature between 40°F and 50°F. That way, they're always ready to take a charge.

6°C may be a little high for the charge cutoff. I think 10 amps of charge at 3°C or 4°C wouldn't be a problem.
 

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