Battery size

[pezz]

What size starting/cycle battery are people running?

Have a Hds 12 and 9 running of a 120amp 800 cca and need a new one just thinking what I had was overkill and heavy!

[seamonkey]

What motor are you running?

[bamm]

Originally Posted by pezz

What size starting/cycle battery are people running?

Have a Hds 12 and 9 running of a 120amp 800 cca and need a new one just thinking what I had was overkill and heavy!

Cca = cold cranking amps

120a how many amps u have when not getting charged via alternator

Ur hds units would lucky too draw 5amps each from memory someone correct me if this is wrong

[seamonkey]

CCA is basically starting power. That's where the type of motor comes into it. What the poster needs to look at is RC - Reserve Capacity and that's in minutes.

The more pumps, sounders etc the more RC minutes required. For couple of HDS's and pumps 120mins RC would be a starting point. If your run an Optimax the biggest you can fit and afford is the way to go.

[pezz]

Running 115hp merc.

Rc is 180min.

Suggest I stick to thE same then which is a supercharge all rounder.

[seamonkey]

Yep. Before you jump price up an Optima D27m or D31M blue top. Little lower in RC rating but a better construction and delivery and smaller. Allrounder is a good all rounder though.

[pezz]

I was looking at the optima but wasn't sure on size.

I'll have another look at the ones you have suggested.

pezz.