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Old 10-07-2018, 15:46   #1
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Different battery profiles same charge source

On our Outremer we use Fireflys as the house and agms as the starting batteries. The alternators are stock but running through balmar 614 regulators that are set for the FFs .
In theory the starting batteries are not getting properly charged .
How have other. People dealt with this
We also have 900 watts of solar and a 60 amp sterling charger all set for theFF batteries profile
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Old 10-07-2018, 15:54   #2
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Re: Different battery profiles same charge source

First off, Firefly "carbon foam" are AGM, just a specific type, like Odyssey or Northstar TPPL.

You are set up properly, the bigger more costly deep cycling House bank gets the coddling,

Starters are barely used, should be cheap and robust, they get what they get and don't complain.

Should not be a problem, certainly not worth putting in a DCDC charger.

Focus on **verifying** yourself the Firefly are getting what they are supposed to, with an ammeter.
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Old 10-07-2018, 15:55   #3
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Re: Different battery profiles same charge source

What combiner / ACR is joining Starter to House?

What model batt is Starter? Maybe link to its technical charge profile specs?
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Old 10-07-2018, 20:56   #4
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Re: Different battery profiles same charge source

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Originally Posted by john61ct View Post
What combiner / ACR is joining Starter to House?

What model batt is Starter? Maybe link to its technical charge profile specs?
Thanks for responding , I am aware that the ffs are agm and have set all my equipment to look after them .
I thouht that letting the starting batteries look after themselves (paraphrase) might be the answer.
The boat was fitted with a 5 pole diode style isolator . Which I need to replace as it is cracking in places .
I am looking at the blue seas equipment ,combiners and relays etc
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Old 11-07-2018, 05:15   #5
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Re: Different battery profiles same charge source

How many Starters and what model?
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Old 12-07-2018, 15:43   #6
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Re: Different battery profiles same charge source

Note that the absorption/bulk knee is 14.4V at 25C. The website does not provide a float voltage. Suggest that you contact the manufacturer or Bruce Schwabb at Ocean Planet for the float voltage.

Note also that, as with all LA batteries, the FF have a negative temperature coefficient so all charging sources need temperature compensation on their output.
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Old 12-07-2018, 16:42   #7
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Re: Different battery profiles same charge source

Direct from Bruce:

Firefly float: 13.2V better for longevity than 13.4V, if you have the ability to customize the setpoint.

But when cycling "just stop" is best, no float at all, like LFP.

In storage watch for self-discharged.
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Old 12-07-2018, 19:22   #8
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Re: Different battery profiles same charge source

Many use alternator to charge the house bank with an echo-charger for the starter battery.
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Old 12-07-2018, 19:53   #9
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Re: Different battery profiles same charge source

Quote:
Originally Posted by john61ct View Post
Direct from Bruce:

Firefly float: 13.2V better for longevity than 13.4V, if you have the ability to customize the setpoint.

But when cycling "just stop" is best, no float at all, like LFP.

In storage watch for self-discharged.
That is interesting as there was a note from ff to change float to 13.5 earlier this year. As for the start batteries one side is a ď8feline agm and the other I donít remember
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Old 13-07-2018, 05:07   #10
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Re: Different battery profiles same charge source

No that change was to "allow" a higher Float, not recommend it.

My impression was, for marketing purposes, since so many existing charge sources aren't adjustable.

Like with "drop in" LFP, "sure, no need to swap out your existing infrastructure designed for lead, just drop it in!" sales pitch.
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Old 13-07-2018, 05:12   #11
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Re: Different battery profiles same charge source

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Many use alternator to charge the house bank with an echo-charger for the starter battery.
Echo Charger will drop voltage a bit.

A suitably sized Blue Sea ACR is best, but expensive.

If alt is the only charge source you need for Starters, then a $50 ignition wired solenoid will do.
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