Good day, I have a Victron 75/15 connected to the battery in the camper and the car starter battery is often discharged. Can you please advise me. I would like the following connection. victron 75/15 load output connect to the Votronic standby charger and then Votronic standby charger output to the car starting battery? Has anyone connected it like this?
The load output is powered by the battery, not the PV input, so you'd very possibly find this a poor solution; also please note that loads with high inrush or startup currents (as I suspect your standby charger would qualify as) must not be connected to the load output of the solar controller, as per the user manual
SmartSolar 75-10 to 100-20 User Manual
If the starter battery is often going dead, it is most likely time to replace the starter battery and/or identify and resolve any phantom loads that may be leading to the frequent discharge.
Also check the wiring for loads like a fridge connected to your starter battery. Use a clamp DC meter. Should be next to nothing with ignition off. And with charging voltage on the input to the Votronic you should see a charge current of 2-3A.
Everything in the camper is OK. The car does not start the engine for more than a month, so the battery needs to be recharged. The Voltronic is really just a resistor, a fuse and a diode connected in series. The question is if the Victron accepts the reverse voltage (that's about 6V) and the reverse current of the diode.
There shouldn't be any reverse voltage unless the Votronic is faulty or you don't have a common ground through the system.
The problem is that nobody knows what controls the Load output from the Victron. Is there a relay, transistor or something?
