What Size Battery is Needed For The Cummins Onan Generator?
Updated 01/15/2026 | Published 01/13/2026
Question:
what size cca battery do you need for a starting
asked by: Gerg
0
Expert Reply:
Hey Greg,
For the # CM32ZR Cummins Onan Generator you will generally need a 12V battery with 250-350 cold cranking amps. Usually a group 24 or 26 battery works just fine.
What are you going to be using this for?
expert reply by:
Nick S
0
Product Page this Question was Asked From
Onan Generator - Quiet Series 4000 EVAP Onboard RV Generator - 4,000 Watts - Gasoline
- Generators
- No Inverter
- Gas
- 3001 - 4000 Watts
- Onboard Generator
- 12V Output
- Carbureted
- Electric Start
- Cummins Onan
more information >
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Gerg
1/14/2026
I’m looking at going lithium. Couldn’t find any info about amps required to start. So my thought is 400. Bms battery could start the generator ie 2 200 bms300 hr? Need to replace 6 volts batteries