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Old 07-23-2018, 10:31 AM   #1
Bus Nut
kazetsukai's Avatar
Join Date: May 2017
Location: Windham NH
Posts: 989
Year: 1999
Coachwork: Amtran
Chassis: International RE
Engine: International T444e
Rated Cap: 76
Parallelizing slightly off-voltage sources

I have several sources of 12v, 24v that differ in voltage slightly. Wondering if its okay to put each on common bus bars.

For instance I have my AGM batteries which I'd like to run in 12V config. Are those (that get up to 14.4v) going to be okay wired in parallel with a step-down converter (24v -> 12v) that typically has lower voltages?

How about my 24v stuff? I have a Tesla battery, typically between 22v-24v. I also have a 500W 120vac -> 24v power supply- which could get up to 28v. Can I wire that in parallel?

I know batteries of the same type and size will equalize, but one wouldn't want to put a lawn mower battery in parallel with a solar AGM battery I would think.

Anyone else facing the multiple-sources, multiple-consumers dilemma?

I'm also about to put everything on a common ground- 12V, 24V, 110V, AC and DC.
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Old 07-23-2018, 10:36 AM   #2
Bus Geek
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Join Date: Dec 2016
Location: Weeki Wachee, FL
Posts: 3,028
Year: 1997
Coachwork: Bluebird
Chassis: TC2000 FE
Engine: Cummins 5.9
Rated Cap: 72
Power will always flow from a higher voltage to a lower voltage. Mismatching batteries means your higher voltage unit will always be trying to charge your lower voltage unit, aka your lower voltage unit will always be pulling the higher voltage unit down. This is bad for both of them. An isolation mechanism would be a better plan than letting them connect together.
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