Realistic expectations for my house batteries - Page 12 - SailNet Community
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post #111 of 138 Old 04-18-2019
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Re: Realistic expectations for my house batteries

hpeer-
Be careful with the Honda genset. Their usual "inverter" type gensets are designed for 110/120VAC output, and the 12VDC output is intended JUST for battery charging. The DC quality is incredibly ragged and can damage electronics if it is used as a DC supply directly. Somewhere on the web, there are some wonderful o'scope pictures showing this in detail.

FWIW.
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post #112 of 138 Old 04-19-2019
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Re: Realistic expectations for my house batteries

Best to just pretend its not there, piddling amps level anyway.

Use a quality shore charger whose max output is just under say 90% load off the main 115V output.

Ideally one that lets you derate output so can be run concurrently with other loads even when attached to a thirsty high-CAR bank when it's depleted.
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post #113 of 138 Old 04-19-2019
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Re: Realistic expectations for my house batteries

John,

Thanks for the warning. Iíve never used that 12vdc feature. I just use it as a source to run my charger.

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post #114 of 138 Old 04-19-2019
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Anyone have experience with the Oasis Firefly batteries?
The press on them is pretty good (80-90% discharge w/o damage, quicker charging times), but I don’t know anyone who actually owns one.
I understand they’ve addressed the uneven quality issues they had several years ago although production levels lag and there’s a wait time when ordering.
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post #115 of 138 Old 04-19-2019
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Re: Realistic expectations for my house batteries

Yes, they live up to the hype as specialist for resisting PSOC and low-DoD abuse.

In markets where their cost is within coooeee of LFP, latter will be a better choice IMO.

Yes chronically backordered need to plan ahead, Bruce @ OceanPlanet is da man in NA, for QC commissioning and good warranty / support. I would not order direct from India.

Maine Sail has written up detailed test reports, with Nigel Calder I believe, apparently their inventor lives nearby.
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post #116 of 138 Old 04-19-2019
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Re: Realistic expectations for my house batteries

John, do you have personal experience with Firefly batteries? Jay said he is aware of the press on them, but didn't know anyone who actually owned them, and was seeking such experience.

Mark
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post #117 of 138 Old 04-19-2019
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Mark I know you’re a Li fan still many aren’t. Take a peak at affordable cruising or look at what’s inside most cruising boats. It isn’t Li. I’m on year 6 of my lifelines. Probably put carbon in when they go. Space and weight aren’t a concern. With solar and wind getting to 100% soc isn’t as well. Cost is. Replacing/ reprogramming charging systems is.
At present with 1020 usable amp hours isn’t. Getting to run the generator with a load is.
My situation is not unusual so Li is overkill for many.
OP asked a good question. I’ve been told for a full time cruiser 8-10 years is reasonable. That’s a passed along opinion. Take it as such.

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post #118 of 138 Old 04-19-2019
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I think people have the wrong idea...the lfp batt cells are stable...not crazed on meth...
I trust the cells more than i do the plethora of bms's
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post #119 of 138 Old 04-19-2019
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Re: Realistic expectations for my house batteries

Quote:
Originally Posted by outbound View Post
Mark I know youíre a Li fan still many arenít. Take a peak at affordable cruising or look at whatís inside most cruising boats. It isnít Li. Iím on year 6 of my lifelines. Probably put carbon in when they go. Space and weight arenít a concern. With solar and wind getting to 100% soc isnít as well. Cost is. Replacing/ reprogramming charging systems is.
At present with 1020 usable amp hours isnít. Getting to run the generator with a load is.
My situation is not unusual so Li is overkill for many.
OP asked a good question. Iíve been told for a full time cruiser 8-10 years is reasonable. Thatís a passed along opinion. Take it as such.
I'm not sure why you are addressing this to me. I'm happy with whatever battery people want on their boats. As far as my posts on LFP, I was only addressing some misconceptions, and warning people about "experts" who may not actually have any real experience with them. Same for the carbon foam above.

You will pay the same for Firefly as for LFP. Programming charging sources should not be onerous. Replacing poor charging sources could be - but these types should probably be replaced for the sake of any battery chemistry health. Poor charging sources kill lead as fast as they do lithium. I can't think of a decent model of charging source - solar, wind, mains - that can't safely charge lithium. I can think of bad models that can't, and shouldn't be used with lead either.

8-10 years for a battery bank for a full-time cruiser is optimistic. That is from real experience over this time period with optimized charging, electrical, and battery maintenance systems. Gel possibly, FLA not.

As I understand it, your bank is not in use full-time, so 6yrs is not a full-use lifespan. This is not a judgement, but it is important to note. Some here have been describing the life of their battery banks, while discounting the fact that the banks are laid up half the year, and hooked to the dock doing no cycles, or shallow cycles, most of the time when they are in use. Many more years of life should be expected for these batteries over heavily used batteries of the same type - but one cannot make lifespan claims in general without noting this important point.

Most people who are heavy use and think they are getting long lifespan have over-provisioned, and not realized until the end how bad their batteries had become.

Mark

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Re: Realistic expectations for my house batteries

Outbound, to put a finer point on my above post, please refer to post #77, where I wrote:

"If money is the sole, or overriding, consideration, then flooded golf cart batteries can't be beat. If one is not cruising or living full-time off grid, then LFP doesn't make as much sense."

Mark

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