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Old 01-27-2014, 06:25 AM   #7
FF
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Join Date: Oct 2007
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You can use deep cycle batteries for household and electronics. But engine starting batteries should not be deep cycle. You need the high output of starting batteries for this purpose.

Not always,

ALL that is needed for a great start is enough plate area , so the voltage at the starter stays up.

Even a 50% discharge bank of house batts , if large enough, will happily start most diesels .

The problem comes IF the engine doesnt start right away.

Cranking till dead a start batt is only covering the plates with gas bubbles , so it can attempt another start after a resting period.

Cranking a house set till dead will be many minuets and melt the starter motor.

I prefer to wire the dash V meter to the starter terminal so the crank voltage at the starter can be observed.

Under 9V cranking becomes a health problem for the starter. motor.
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