I haven't seen any BMS for lead-acid though I suspect they exist or DIY kits for lithium could be modified. But...the easy way out is just separate 12V chargers (or banks on a charger). You can't do that with lithium easily because no one makes 4.1V chargers :)
-Keith
--- In electricboats@yahoogroups.com, Bill <bill@...> wrote:
>
>
> Keith -
>
> Thank you. Any recommendations on systems to help balance the series?
>
> Bill
>
>
> On Feb 5, 2011, at 12:59 PM, "aweekdaysailor" <aweekdaysailor@...> wrote:
>
> > Charging in series (72V) - and especially in a string that long is a problem. This is one area where the solar/wind can help - if you get each of the batteries a nice 12V (staged) charge source, it can compensate for the unequal charging that the series string will impose.
> >
> > But it's an expensive way to do it. I would opt for 2, 3-bank 12V chargers in place of the Zivan and give each battery the attention they deserve. That also gives you some redundancy in case of a failure in the charger.
> >
> > -Keith
> >
> > --- In electricboats@yahoogroups.com, "aweekdaysailor" <aweekdaysailor@> wrote:
> > >
> > > I think the (propulsion) batteries are light for this setup. However...you have a genny
> > >
> > > But...much depends on your local sailing conditions. Solar and wind are a complete waste of time IMHO on a boat this size. Consider the ratio of drive requirements to potential input.
> > >
> > > The only potential use for solar/wind is to top up to full voltage if your main charge sources don't handle it properly.
> > >
> > > My $0.02
> > >
> > > -Keith
> > >
> > > --- In electricboats@yahoogroups.com, "green_on_blue" <bill@> wrote:
> > > >
> > > >
> > > > New to the Forum but have read through many of the postings. The
> > > > information sharing and candor of the forum members is awesome and much
> > > > appreciated.
> > > >
> > > >
> > > >
> > > > Apologies for the length of the first post ….
> > > >
> > > >
> > > >
> > > > Below is a summary of a project that my wife and I have undertaken to
> > > > convert our 44' sailboat to electric propulsion. We are hoping to
> > > > turn our personal experience into a future business venture that brings
> > > > electric propulsion to more people.
> > > >
> > > >
> > > >
> > > > Last weekend we finished pulling the diesel ICE so we are obviously
> > > > committed but any thoughts for "hurdles to watch out for" or
> > > > fine tuning suggestions are always welcome.
> > > >
> > > >
> > > >
> > > > We are working with a great company â€" Sally and David at Annapolis
> > > > Hybrid Marine â€" for the Thoosa electric propulsion motor and have
> > > > also been talking with Charlie Johnson at JTB Marine in St. Pete
> > > > Florida, as he has done top-notch work on our boat in the past when we
> > > > were in Florida.
> > > >
> > > >
> > > >
> > > > Current State
> > > >
> > > > - Hylas 44 Center Cockpit â€" 22,000 lbs displacement
> > > >
> > > >
> > > >
> > > > - Propulsion
> > > >
> > > > o Yanmar Diesel â€" 55 HP â€" Model 4JHTE
> > > >
> > > > o 17" diameter â€" 3 blade "feathering", Self-Pitching
> > > > Prop
> > > >
> > > > o 105 gallons of fuel
> > > >
> > > >
> > > >
> > > > - Power Sources
> > > >
> > > > o Balmar 12v Alternator
> > > >
> > > > o Shore Power â€" 110AC â€" 30A
> > > >
> > > > o NextGen â€" 5.5kw diesel genset â€" 110AC
> > > >
> > > > o Victron 12v Charger
> > > >
> > > >
> > > >
> > > > - Power Storage
> > > >
> > > > o House Batteries â€" Northstar AGM â€" 400 ah capacity
> > > >
> > > > o Engine Battery
> > > >
> > > > o Windlass Battery
> > > >
> > > >
> > > >
> > > > - Large Power Consumers
> > > >
> > > > o 12v DC Refrig
> > > >
> > > > o 110v AC Refrig
> > > >
> > > > o 110v AC Air Conditioners (2)
> > > >
> > > > o Auto-pilot â€" Rathyeon (Electric Drive)
> > > >
> > > > o Chartplotter/Radar â€" Nav Instruments
> > > >
> > > > o Electric Windlass
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Proposed State â€" planning to be back in the water this Spring /
> > > > Summer
> > > >
> > > > - Propulsion
> > > >
> > > > o ASMO Marine - Thoosa 12000 and controller
> > > >
> > > > o 21" diameter â€" 3 blade fixed prop. Have not determined
> > > > pitch yet.
> > > >
> > > >
> > > >
> > > > - Power Sources
> > > >
> > > > o Shore Power â€" 50A â€" split for 220AC and 110AC applications
> > > >
> > > > o NextGen â€" 5.5kw diesel genset â€" 220AC
> > > >
> > > > o Victron 12v Charger: 110AC input â€" for house bank
> > > >
> > > > o Zivan 72v Charger: 220AC input â€" for motor bank
> > > >
> > > > § considering other chargers but this seems likely.
> > > >
> > > >
> > > >
> > > > - Power Storage
> > > >
> > > > o House Batteries â€" Northstar AGM (2 â€" parallel) â€" 400 ah
> > > > capacity
> > > >
> > > > o Motor Batteries â€" Northstar AGM (6 - series) â€" 200 ah
> > > > capacity
> > > >
> > > > o Windlass Battery
> > > >
> > > >
> > > >
> > > > - Large Power Consumers
> > > >
> > > > o 12v DC Refrig
> > > >
> > > > o 110v AC Air Conditioner â€" 1 unit (one removed)
> > > >
> > > > o Auto-pilot â€" Rathyeon (Electric Drive)
> > > >
> > > > o Chartplotter/Radar â€" Nav Instruments
> > > >
> > > > o Electric Windlass
> > > >
> > > >
> > > >
> > > > In the future we plan to also add in solar and wind generation but we
> > > > want to see how the systems performs in real life â€" and allow the
> > > > "cruising kitty" to grow back.
> > > >
> > > >
> > > >
> > > > All thoughts are welcome as we go through this journey.
> > > >
> > > >
> > > >
> > > > We are passionate about the idea of electric versus diesel but also know
> > > > there is a balance that is needed to get more people comfortable with
> > > > the idea. Our hybrid approach with the diesel genset is the balance
> > > > for us in the beginning but we are hopeful that technology and pricing
> > > > will one day allow batteries, solar, etc. to push the genset and diesel
> > > > fuel off the boat altogether.
> > > >
> > >
> >
> >
>
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