Harbor Nights
Veteran Member
Hello trying to find out how big of a battery i should have to start my mains. So far i dont see a requirement in the engine manual, but will look a 3rd time....
The current set up is one that i don't like as it would seem to be "bigger is best because we did no know better" mind set that was used in the old days
Current setup. Twin engine with two 8Ds hooked together to make a large start battery ( i always forget which is parallel /series). Both batteries start either engine and has a 12v starter.
Looking for thought of what others are using. The boat is set up with the ability to start using the house battery if needed so in my mind one battery to start both mains is more than enough power.
So the questions that comes to mind.
1.Why not use a single 8D to start both mains?
2. Do you think a single type 31 is big enough to start the mains.
3. How about two type 29 or 31 to start either engine if the MCA is needed (lets face it, the 8D is very heavy and i dont think i can lift it nearly 5 feet up to get it out of the engine room)
I am leaning towards #2 as the first choice then #3.
Engine are cummins V555 that start fast.
Thank You.
The current set up is one that i don't like as it would seem to be "bigger is best because we did no know better" mind set that was used in the old days
Current setup. Twin engine with two 8Ds hooked together to make a large start battery ( i always forget which is parallel /series). Both batteries start either engine and has a 12v starter.
Looking for thought of what others are using. The boat is set up with the ability to start using the house battery if needed so in my mind one battery to start both mains is more than enough power.
So the questions that comes to mind.
1.Why not use a single 8D to start both mains?
2. Do you think a single type 31 is big enough to start the mains.
3. How about two type 29 or 31 to start either engine if the MCA is needed (lets face it, the 8D is very heavy and i dont think i can lift it nearly 5 feet up to get it out of the engine room)
I am leaning towards #2 as the first choice then #3.
Engine are cummins V555 that start fast.
Thank You.