Larry,
I assume you are talking about a 48volt battery charger designed for flooded lead acid (FLA) chemistry batteries. If you are asking about absorbed glass mat "starved electrolyte" lead acid (AGM) batteries, or gell batteries, or any of the lithium variants, or nickel variants, the answer would be very different. Note: different chemistry means different charger and different maintenance requirements.
I favor Richard's (fullkeel2000) approach: mostly charge the batteries individually (using "isolated" chargers), and keep them healthy with the continuous "top cycling" of solar. For FLA batteries, it is helpful to get the electrolyte to bubble hydrogen and oxygen. This helps keep the cells working evenly together and stirs the battery acid so that the lead plates inside the battery fully contribute top to bottom.
For a lower parts count, others reasonably favor a single 48v FLA charger of about 1000 watts (12v times 4 batteries in series times two banks times 10 amps charging per battery). FLAs like approximately C/10 charge rates (very different that 10C, which some lithiums can handle under precise lab conditions). So a 100 Ah (amp hour, AHr, C, capacity) FLA battery loves to charge at 10 amps for the "bulk" of it's dinner, then snack on 2 or 3 amps for a long dessert.
All this is contingent on each of your 8 batteries being of the same capacity and health and internal electro-chemical behavior. A runt or a bully of a battery messes them all up.
Mark Stafford
--- In electricboats@yahoogroups.com, "Larry Doyle" <ldoyle@...> wrote:
>
> Speaking of charging a battery pack, how does a battery charger charge a pack that is comprised of four 12 volt batteries in series paralleled with another set of four 12 volt batteries wired in series?
>
>
>
> From: jlwuja@...
> Sent: Saturday, November 16, 2013 1:02 PM
> To: electricboats@yahoogroups.com
> Subject: [Electric Boats] RE: practicality ?
>
>
>
> Hello, Dependability? Practicality? Both, I guess, but more importantly, I fear some unforeseen calamity in which my batteries discharge to a level from which they cannot be restored. Is that a realistic concern? They thought of flushing the battery investment down the toilet is very frightening. Again, thanks for assistance. This is all new to me. John
>
>
>
> ---In electricboats@yahoogroups.com, <sirdarnell@> wrote:
>
>
> Actually a small solar panel just big enough to overcome self-discharge rates wouldn't need anything but a diode to prevent battery power back flowing to the panel.
>
>
>
>
>
> ---In electricboats@yahoogroups.com, <dominic.amann@> wrote:
>
>
> A correctly sized solar panel with a suitable charge controller can provide safe maintenance charging for most battery setups without a hookup.
>
>
>
> On Thu, Nov 14, 2013 at 11:30 AM, <jlwuja@> wrote:
>
>
> Good Day,
>
>
>
> I'm in the thought process of an electric repower of my boat. Most everything says I should convert based on numbers. One of the considerations, absenteeism, just hasn't been addressed in the sources that I've utilized.
>
>
>
> So here's the question, if an boat owner can't visit a boat for periods of time that could run up to two months on occasion coupled with more frequent absences lasting several weeks, is there a better battery choice to be made?
>
>
>
> In another two years or so, I should hope to be able to pay much more (almost daily) and long periods of absenteeism would virtually be eliminated.
>
>
>
> Should I wait to do the repower? I have a perfectly working diesel presently.
>
>
>
> Thanks for your informed responses. John
>
>
>
>
>
> --
>
> Dominic Amann
> M 416-270-4587
>
| Reply via web post | Reply to sender | Reply to group | Start a New Topic | Messages in this topic (15) |
No comments:
Post a Comment