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Old 03-18-2021, 06:16 PM   #41
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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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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
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Thanks catalinajack,

That is good info. I will check out the "marinehowto" website.
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Old 03-04-2024, 07:48 AM   #44
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Drive Dampers

I see the discussion of replacing the drive damper plate.
How do you know when it is time to replace?
I have the Lehman 120s and have started hearing a ringing noise in one engine when in gear. Generally at 1000-1400rpm. Noise goes away out of gear even at the same rpm.
I have owned this boat for 12 years and put approx 1200 hours on it.
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Old 03-04-2024, 07:58 AM   #45
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It is hard to diagnose because they fail gradually.

It had not been replaced when I bought boat.

Engine was noisy at idle, a lot of rocker clatter.

Once changed, very easy, engine room noise cut in half.
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Old 03-04-2024, 06:50 PM   #46
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Here's my experience doing a solo examination of my damper plate using a block and tackle with some wood scraps. I now carry everything needed on board.

https://www.trawlerforum.com/forums/...kit-65045.html
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Old 03-06-2024, 08:08 PM   #47
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Take a look at alternator output curves before you decide on an alternator.

for example https://balmar.net/balmar-technology...output-curves/
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