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12-22-2018, 05:48 PM
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#21
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Guru
City: Vermont
Join Date: Jan 2013
Posts: 10,092
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Quote:
Originally Posted by BandB
The part that keeps me confused is that over the years we've had others do the same but no one ever reports back talking about how wonderful and saying they'd do the same thing again. I get the feeling the benefits are there, but more on the line of slight improvement than of revolutionary.
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Here is some discussion on feedback after two years Any two years reviews for Firefly batteries? - Page 3 - Cruisers & Sailing Forums
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MVTanglewood.com
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12-22-2018, 09:23 PM
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#22
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Guru
City: Fort Lauderdale. Florida, USA
Join Date: Jan 2014
Posts: 21,449
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Quote:
Originally Posted by twistedtree
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Yes and that still doesn't tell me enough to run out and buy any. It's very mixed and still very little long term usage, a couple up to two years.
People who follow the link, don't overlook there is a page 1 and page 2.
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12-22-2018, 10:08 PM
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#23
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Guru
City: Kitimat, North Coast BC
Vessel Name: Badger
Vessel Model: 30' Sundowner Tug
Join Date: Jul 2012
Posts: 5,946
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Quote:
Originally Posted by BandB
The part that keeps me confused is that over the years we've had others do the same but no one ever reports back talking about how wonderful and saying they'd do the same thing again. I get the feeling the benefits are there, but more on the line of slight improvement than of revolutionary.
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https://www.pacificnwboatertested.co...-really-better
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"The most interesting path between two points is not a straight line" MurrayM
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12-22-2018, 10:25 PM
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#24
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Guru
City: Fort Lauderdale. Florida, USA
Join Date: Jan 2014
Posts: 21,449
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Quote:
Originally Posted by MurrayM
[url]https://www.pacificnwboatertested.com/blogs/tested-boat-products/are-carbon-foam-batteries-really-better
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Thanks for the link. Still less than two years. Perhaps a year from now we'll hit some three year users.
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12-23-2018, 07:10 AM
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#25
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Guru
City: Vermont
Join Date: Jan 2013
Posts: 10,092
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Quote:
Originally Posted by BandB
Thanks for the link. Still less than two years. Perhaps a year from now we'll hit some three year users.
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I think the 5-10 year window will tell the longevity story. But a battery's basic performance characteristics matter quite a bit too, and I think that part has been demonstrated. So I think if someone really wants the ability to more deeply discharge, and faster recharge, and understands that lifespan beyond 2 years is still an unknown... it may be worth it.
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MVTanglewood.com
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12-23-2018, 12:06 PM
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#26
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Senior Member
City: Presently SE Georgia
Vessel Name: Gone Walkabout
Vessel Model: 1999 KadeyKrogen 39
Join Date: Jul 2013
Posts: 187
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Yup, good summary. I'm betting that the imo proven FF PSOC properties will translate into substantially longer bank service life. Plus peace of mind with not having to worry about getting back to 100% SoC constantly. But it is a bet.
Here's an interesting & comprehensive article by Rod Collins on AGM fractional C charging, also a good retread for those who understand it: https://marinehowto.com/how-fast-can...ry-be-charged/.
Quote:
Originally Posted by twistedtree
I think the 5-10 year window will tell the longevity story. But a battery's basic performance characteristics matter quite a bit too, and I think that part has been demonstrated. So I think if someone really wants the ability to more deeply discharge, and faster recharge, and understands that lifespan beyond 2 years is still an unknown... it may be worth it.
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__________________
Rgds,
Wil
In a Mad World, only the Mad are Sane
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12-25-2018, 07:28 PM
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#27
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Senior Member
City: Marathon, FL & On Loop
Vessel Name: Maka Honu
Vessel Model: Ta Yang, 42 Tayana PH Trawler 1976
Join Date: Mar 2014
Posts: 313
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Simple is good lined up 7 trogan T1285 lead acid in parallel to.replace 4 series golf cart batts. Upgraded inv/ charger to Magnum 2800. Works great.
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12-26-2018, 09:55 AM
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#28
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Senior Member
City: Presently SE Georgia
Vessel Name: Gone Walkabout
Vessel Model: 1999 KadeyKrogen 39
Join Date: Jul 2013
Posts: 187
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Though more expensive, AGMs are simpler to take care of than wet cells. Due to PSOC tolerance, FFs even more so. I think you meant T1275s....
__________________
Rgds,
Wil
In a Mad World, only the Mad are Sane
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12-26-2018, 10:15 AM
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#29
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Senior Member
City: Marathon, FL & On Loop
Vessel Name: Maka Honu
Vessel Model: Ta Yang, 42 Tayana PH Trawler 1976
Join Date: Mar 2014
Posts: 313
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Yes thanks T-1275 for our load profile bank 7 was ideal .
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12-26-2018, 10:17 AM
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#30
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Senior Member
City: Marathon, FL & On Loop
Vessel Name: Maka Honu
Vessel Model: Ta Yang, 42 Tayana PH Trawler 1976
Join Date: Mar 2014
Posts: 313
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Lead acid for house to keep all batts same type in our case. We have easu access for check and water.
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12-28-2018, 01:55 PM
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#31
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Veteran Member
City: Spicer
Vessel Name: Rozinante
Vessel Model: Taswell 43
Join Date: Jun 2016
Posts: 65
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Following. We're currently using 6 T105s for a house bank, and like you, we need to keep them in the current compartment.
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12-28-2018, 02:46 PM
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#32
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Senior Member
City: Potomac Maryland
Join Date: Jan 2013
Posts: 105
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Quote:
Originally Posted by Wil
I'm swapping out my existing 12v house bank (six Trojan GC2s in 3P2S) for six FireFly L15+s in either (12v) 6S2P or 2P6S configuration.
Background: FF L15+s are interesting in that each battery consists of 2 x 450Ah/2v cells that can be set up in either series or parallel configuration. This allows using the same six L15+s to set up either a 12v/900Ah or 24v/450Ah bank.
I'm looking for input here first on which 12v FF configuration (6S2P or 2P6S) to set up before I confirm with the factory, Schwab, etc. The 6S2P (see drawing of Old Bank and New Bank together) is much neater than 2P6S config (see Alternate configuration drawing), but maybe the 2P6S is better for some reason?
The batteries must go in the box as shown for the old T105 and new FF L15+ footprints to match.
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If I interpreted your diagrams correctly, there seems to be no problem. The confusion arises because inside each rectangle you are referencing two separate 2-volt batteries.
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Rodolfo
SeaTrek
Marine Trader 40
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12-29-2018, 08:03 AM
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#33
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Senior Member
City: Victoria, BC
Vessel Name: TUGAWAY
Vessel Model: Nordic Tug 37
Join Date: Jun 2015
Posts: 137
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I put a set of 6 12V firefly batteries into our Nordic Tug 37 a year ago for 660 Ah total.
So far they have worked very well. They have a flatter voltage curve than the previous AGM’s ( I.e. dropping to 12.7 V pretty quickly but then staying there a good while) They tolerate draws down to 40% capacity without any difficulty keeping voltages north of 12.2V.
With Solar charging and a desire to keep generator runs to a shorter duration, the Fireflies (in theory) allow one to get back to 90% SOC and not be damaging the bank.
So far I'm very pleased and have not seen a degradation in performance but I will need a few more years before I can be definite.
-evan
Here's a link to the Wiring Diagram and Pic of installation
https://eheffa.zenfolio.com/p513003349/ea11ea0ee
https://eheffa.zenfolio.com/p513003349/e9f13d85c
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12-29-2018, 08:03 PM
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#34
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Senior Member
City: Presently SE Georgia
Vessel Name: Gone Walkabout
Vessel Model: 1999 KadeyKrogen 39
Join Date: Jul 2013
Posts: 187
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Each FF L15+ battery indeed does consist of 2 x 2v cells that can be wired in series or parallel.
Quote:
Originally Posted by rolomart3
The confusion arises because inside each rectangle you are referencing two separate 2-volt batteries.
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__________________
Rgds,
Wil
In a Mad World, only the Mad are Sane
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12-29-2018, 08:26 PM
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#35
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Senior Member
City: Presently SE Georgia
Vessel Name: Gone Walkabout
Vessel Model: 1999 KadeyKrogen 39
Join Date: Jul 2013
Posts: 187
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Thanks for the example, nice to hear they're providing good service to date. Your six FF G31s are 12v each, you paralleled them all up. My six FF L15+s are a max of 4v each, so require a series-parallel setup. Actually could go with the six 2v version (2P6S), but the 6S2P version has the advantage imo.
Quote:
Originally Posted by eheffa
I put a set of 6 12V firefly batteries into our Nordic Tug 37 a year ago for 660 Ah total.
So far they have worked very well. They have a flatter voltage curve than the previous AGM’s ( I.e. dropping to 12.7 V pretty quickly but then staying there a good while) They tolerate draws down to 40% capacity without any difficulty keeping voltages north of 12.2V.
With Solar charging and a desire to keep generator runs to a shorter duration, the Fireflies (in theory) allow one to get back to 90% SOC and not be damaging the bank.
So far I'm very pleased and have not seen a degradation in performance but I will need a few more years before I can be definite.
-evan
Here's a link to the Wiring Diagram and Pic of installation
https://eheffa.zenfolio.com/p513003349/ea11ea0ee
https://eheffa.zenfolio.com/p513003349/e9f13d85c
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__________________
Rgds,
Wil
In a Mad World, only the Mad are Sane
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