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Old 05-22-2016, 11:05 AM   #21
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By the way, battery life needs to be measured by number of cycles and amps drawn out. Years doesn't mean much, if anything, at all assuming proper maintenance. Due to our cruising style and preferred moorage (anchoring and moorings instead of docks), as well as unfettered usage, we pounded our inverter bank more in three years than a typical recreational boater would in 12. Ditto the various starting and house DC batteries, especially the generator.
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Old 05-23-2016, 09:13 AM   #22
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MaineSail (CMS) to the rescue again. The write-up is more about deep cycle batteries, but there is lots of good info about starter and dual-purpose batteries too.

What Is A "Deep Cycle" Battery? Photo Gallery by Compass Marine How To at pbase.com
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Old 05-23-2016, 09:30 AM   #23
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Has anyone used this system? It seems like a better way to go, especially if you already have a house battery bank. It has separate charge connections, and cranks like a regular battery without the weight. The come in 12 & 24 volt sizes and the biggest one weighs 18 lbs...
Maxwell Technologies Engine Starting Module
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Old 05-23-2016, 03:24 PM   #24
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Quote:
Originally Posted by stubones99 View Post
Has anyone used this system? It seems like a better way to go, especially if you already have a house battery bank. It has separate charge connections, and cranks like a regular battery without the weight. The come in 12 & 24 volt sizes and the biggest one weighs 18 lbs...
Maxwell Technologies Engine Starting Module

Looks like it replaces ONE (out of how many?) Group 31 start batteries. And then provides either 1800 or 900 CCAs, depending on model.

It's unclear, to me, whether that counts OTHER Group 31 start batteries in the same bank or not.

Two of our G31s in one bank -- already -- would provide 2300 CCAs.

Quick glance at their site, didn't immediately see costs for comparison...

Good weight savings, I think... at least for the installation chore. Can't guess if it'd be significant otherwise unless dealing with boatloads o' other batteries...

-Chris
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Old 05-23-2016, 04:39 PM   #25
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You could use the house bank to charge the start "battery" so it would replace both (if 24vdc required). and it's not cheap... but infinite charge / discharge cycles.
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