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 – Sally and David at Annapolis
> > Hybrid Marine – 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 – 22,000 lbs displacement
> >
> >
> >
> > - Propulsion
> >
> > o Yanmar Diesel – 55 HP – Model 4JHTE
> >
> > o 17" diameter – 3 blade "feathering", Self-Pitching
> > Prop
> >
> > o 105 gallons of fuel
> >
> >
> >
> > - Power Sources
> >
> > o Balmar 12v Alternator
> >
> > o Shore Power – 110AC – 30A
> >
> > o NextGen – 5.5kw diesel genset – 110AC
> >
> > o Victron 12v Charger
> >
> >
> >
> > - Power Storage
> >
> > o House Batteries – Northstar AGM – 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 – Rathyeon (Electric Drive)
> >
> > o Chartplotter/Radar – Nav Instruments
> >
> > o Electric Windlass
> >
> >
> >
> >
> >
> > Proposed State – planning to be back in the water this Spring /
> > Summer
> >
> > - Propulsion
> >
> > o ASMO Marine - Thoosa 12000 and controller
> >
> > o 21" diameter – 3 blade fixed prop. Have not determined
> > pitch yet.
> >
> >
> >
> > - Power Sources
> >
> > o Shore Power – 50A – split for 220AC and 110AC applications
> >
> > o NextGen – 5.5kw diesel genset – 220AC
> >
> > o Victron 12v Charger: 110AC input – for house bank
> >
> > o Zivan 72v Charger: 220AC input – for motor bank
> >
> > § considering other chargers but this seems likely.
> >
> >
> >
> > - Power Storage
> >
> > o House Batteries – Northstar AGM (2 – parallel) – 400 ah
> > capacity
> >
> > o Motor Batteries – Northstar AGM (6 - series) – 200 ah
> > capacity
> >
> > o Windlass Battery
> >
> >
> >
> > - Large Power Consumers
> >
> > o 12v DC Refrig
> >
> > o 110v AC Air Conditioner – 1 unit (one removed)
> >
> > o Auto-pilot – Rathyeon (Electric Drive)
> >
> > o Chartplotter/Radar – 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 – 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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