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Old 03-18-2021, 06:16 PM   #41
kchace's Avatar
City: Brookline, NH
Vessel Name: Blue Heaven
Vessel Model: Albin 43 classic double cabin, twin 135 Lehmans
Join Date: Sep 2013
Posts: 2,054
Originally Posted by Kevin.Bridgen View Post
Thanks Ken,

I was looking at a couple Balmar 120s. I already have double Vs just for redundancy sake on the circ pump.

Trying to get info out of manufacturers is like pulling hens teeth.
Trojan says 10-13%, Crown says 10-20%, Rolls recommends 10% with 5% min and 20% max.

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Old 03-19-2021, 01:20 AM   #42
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City: Edgewater, MD
Vessel Name: Catalina Jack
Vessel Model: Defever 44
Join Date: Nov 2011
Posts: 2,442
If it helps, I have a 920 ah bank (Deka FLA) charged by two Balmar 100-amp alternators. It takes 4.5 hours to charge them to 100% when discharged to 50%. Assuming a continuous output of 80 amps, that is a total of 160 amps of potential charging. However, the batteries will only accept a fixed number of amps so increasing alternator output charge the batteries any faster. Using 15% as the CAR yields 148 amps so I have no use for larger capacity alternators.

As for the higher acceptance rates of AGMs, they are of no advantage in this regard without alternators capable of delivering more amps. But, as others have noted, alternators in excess of 100 amps require dual drive or serpentine belts. Converting will cost $500 per engine not to mention another $1,000 or more for a higher output alternator. And then you may encounter bracketry challenges.

AGMs are an answer for some situations (difficult access to water batteries, for example) but I see no functional advantage over FLA for most use profiles. Also, AGMs fueled by low-amp internally regulated alternators will be murdered in short order. See Rod Collins' article on his MarineHowTo website for a detailed explanation of why.

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Old 03-22-2021, 01:06 PM   #43
City: Surrey
Vessel Name: Copper Moon
Vessel Model: Universal Tri-Cabin
Join Date: Oct 2020
Posts: 17
Thanks catalinajack,

That is good info. I will check out the "marinehowto" website.

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