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Topic: Best battery disconnect (Read 422 times) previous topic - next topic

Best battery disconnect

Is there a recommended Start battery disconnect switch for the 2000 U320 M11 450. Is there a recommended amp rating. Thanks

Re: Best battery disconnect

Reply #1 –
If your coach has two large start battery cables connected to battery bank, one may be a direct wire to starter, and if there are no more wires running from starter battery terminal, there will not be any transient start battery loads and usually not necessary to put a disconnect switch on this high-amp use cable.

You could then shut down all start battery loads with a reasonable priced disconnect switch on the other big cable and not ever restrict starter current.

Most battery disconnect switches could offer some resistance to the very high amp starter motor draws and any voltage drop can stress / overheat (starter) motors.

Re: Best battery disconnect

Reply #2 –
9/16 wrench to disconnect the primary ground Wire  Held in place with earth magnets. other than a runaway starter I see no need. If you're concerned of batteries going dead they're happiest disconnected from each other. The weakest one will pull the other two down till they're all dead.
Scott

Re: Best battery disconnect

Reply #3 –
If you are determined to have a disconnect switch on your start battery bank, then the Blue Sea Model 3000 is a suitable candidate.  With a 30 second cranking rating of 1750 amps, it should be able to handle the current draw of your M11 in all but the coldest operating conditions.

HD-Series Heavy Duty On-Off Battery Switch - Blue Sea Systems

See chart below copied from M11 Service Manual:

1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Best battery disconnect

Reply #4 –
Same topic but 11 years ago: Battery Quick Disconnect
John Fitzgerald
1991 U300 (SAI) Side Aisle Island Bed 40'
Detroit 6V92 with Allison Retarder
Meridian (Boise), Idaho
 

Re: Best battery disconnect

Reply #5 –
Quote from: Chuck & Jeannie –
If you are determined to have a disconnect switch on your start battery bank, then the Blue Sea Model 3000 is a suitable candidate.  With a 30 second cranking rating of 1750 amps, it should be able to handle the current draw of your M11 in all but the coldest operating conditions.

HD-Series Heavy Duty On-Off Battery Switch - Blue Sea Systems

See chart below copied from M11 Service Manual:


Chuck wonder how much reduced that would be for the gear reduction starter? I would think the numbers would be much less. Thanks for posting numbers. I knew they were big
Scott