Hi,
I am currently solving the connection of a dual battery system in my oldschool camper VW bus. The power will be generated only by a 14V 55A alternator, solar panels will not be installed.
The picture shows my idea of connecting the system. Will the system work like this?
I only need to power the Eberspacher B1L heating and charging my mobile phone from the camping battery.
Thank you in advance for your help
Greetings from the Czech Republic
Venca
The Cyrix relay is not needed if you are using the dc/dc converter. That has a remote input that can be used to control the charger. Some also have Battery voltage detect levels that can detect when the engine is running - though I haven’t looked into this for a long time.
Alternatively, if the camping battery can also take the 14.4V from the normal lead battery, you could use the cyrix relay, and omit the Dc/Dc charger. If you want to use both relay and charger, then the relay needs to be on the starter battery side of the dc/dc.
Do also make sure that low temperature charging of the camper battery is avoided…
Thank you very much for your response. I tried to draw 2 variants of the modified wiring. Are the diagrams correct and is it possible to use both variants? Which variant is safer? Is it the variant using Cyrix 120A?
And the last question: Is a 40A fuse OK or do I need to use a stronger one?
Apart from both variants having the power source (Starter battery / Alternator) indicated as wired to the dc/dc Output (should be input); they are both good in other respects.
I’ll check the correct ports on the DC-DC charger. Thank you very much for your help.
