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Yes there was a bit missing from my post, the point being if you use D+ then there is no drain when the engine is not running, no other power sources required. So all good (y)

Ive been looking to find away to stop a Victron Orion Tr B2B charger charging LiFePO4 batteries below 0C and I think Ive finally settled on a method. Ive been playing with a W1209 Digital Thermostat to control the B2B via its high input. To my delight the settings are stored in non-volatile...

Ive been testing these and to my disappointment Ive discovered that there is a 10 degree hysteresis, they are designed for rising temperatures so the 5C Normally Closed unit turns on at 5C but turns off at -5C so will not work as a protection for charging lithium, however a 10C would work as it...

Forget that function question, I just have to use a 5C temperature switch in series with an ignition feed to the H input to stop it charging at cold temperatures

Did you work out with the Orion wether the H and L inputs were an OR function or an AND function, I havent got mine yet but was looking to put temperature control on the L and ignition on the H. If they are an OR function then its not going to work.

I’d use the relay for the blue smart mains charger as that hasn’t got a remote control input. As I see it one would control the Orion direct, the other the mains charger via a relay they would then mount on a piece of ally which can be glued to the battery.

I've been looking at this for my own setup and just wondered if you'd considered temperature switches, the mechanical kind, I was considering 5C they come in NC or NO contacts, I believe the contacts are active above that temp so a NC one connected to 0V could control the B2B and another NC...

Yes, even a series pass element will have a volts drop across it, I will go and measure tomorrow!! So if you had a Venus GX unit could you get all these units to talk to each other and not try to compete with each other or is that what you have been doing with a RaspberryPi

Thank you as always for the your input, I havent actually measured the voltage yet, I have assumed it is a series pass element in the Battery Master and therefore in Bulk or absorption mode from Solar or mains charger would pass 14.4v to the starter although it is meant to limit that to 1.1A so...

I'm about to fit an Orion-Tr Smart to my motorhome which currently has a SmartSolar MPPT charging the leisure battery and a VanBitz BatteryMaster maintaining the starter battery. For those with the Orion Tr fitted already, how do you stop the B2B being activated by the Solar charging the starter...

Just an observation but I'm guessing the icebox is empty? I think the characteristics would change with some frozen products in the icebox

You havent said so what are the voltages on the two pins that you connect together? Are you able to measure the current that flows once the input is shorted, Are they the same? You have assumed that the input circuitry is the same but by connecting the pins together of the different units you...