question

jab avatar image
jab asked

how to combine 12v and 24v circuit on boat

i just found out the cyrix-ct does not allow two different voltage levels.

can anyone help me which device(s) i need to allow me to charge my 24v system with my 12v alternator in a way that my 12v (starter) battery doesnt get emptied by the 24v (trolling) circuit

12v24v.jpg

Cyrix Battery Combiner
12v24v.jpg (60.0 KiB)
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2 Answers
wkirby avatar image
wkirby answered ·

A DC-DC charger would solve this problem.
In your diagram you have a common negative, so a non-isolated version would work for you.

The Victron 12/24-15 would do the job:
https://www.victronenergy.com/upload/documents/Datasheet-Orion-Tr-Smart-DC-DC-chargers-non-isolated-360-400W-EN.pdf

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jab avatar image
jab answered ·

thank you wkirby!

any technical reason you recomended the 360-400 W version

just a matter of comfort or other technical reasons to consider?

and would i be able to charge the 12v or even both circuits when at the dock with a 'normal' ac charger?

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