I have a 20ft boat with a outboard jhonson 85 motor. I want to run a stereo with no amp,, a vhf radio,4 blue neon strip lights around seats,,2 under water neon lights rear of boat & 2 head lights.. Is it ok to use car batteries or do they hav to be marine
Car batteries will work if you have some lying around. Marine have carrying handles on and I think are a bit tougher, and not much more expensive. Car batteries are designed basically for starting engines not running lights for ages, deep-cycle ones are supposed to be better for that.
Offhand, your load doesn't sound so bad though I'm not sure what the charging capacity of your outboard is. One battery is probably good. For more flexibility, you can have 2 with a switchover. If you run one down when you are anchored, you can still switch over and start the engine. E.g. get one big enough to run the engine, and maybe a bigger more expensive one for the lamps etc. ("house battery")
(my 32ft sailboat originally had only 1 battery, running nav lights, 7 cabin lights, a VHF radio, autopilot, depth sounder. When I tried running an electric cooler when anchored, that was too much... now I have 2, as above)
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