Steve:
Yes that would work. But, there is that delicate balance of not cooking the batteries in the process. Though I guess if one kept the supply at around 48 volts when motoring the chances of harming the bank would be minimal.
Mike
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Mike,
What if you rectified the voltage off the generator to 48 volts. Send it to both the batteries and the motors, monitor the output of the genset and control the voltage to the batteries? Just thinking….
Steve in Solomons MD
From:
Sent: Thursday, July 22, 2010 7:06 AM
To: ELECTRIC BOAT GROUP
Subject: [Electric Boats] Dual Pro Output current.
"From what I understand the draw rate with the Dual Pro is around 10 amps at 110 Volts and I typically cruise pulling 15 amps on my 48 Volt bank?"
Sam:
Be careful about confusing Ac amps into the charger input vs DC Amps on the output. This is an issue I've been wondering about. I have a feeling the Dual Pro does not charge the bank as fast as the zivan. If the Dual Pro is pulling 10 AC amps from the Honda I am assuming all four batteries in the 48 volt bank are discharged about the same amount . This should be divided evenly between the four individual charges meaning each individual charger is getting 2.5 AC amps. I have not seen a circuit diagram of the Dual pro but, judging from it's weight it seems it has some pretty hefty step down transformers inside. Which will lower the AC voltage but, increase the current on the output of the transformers. I know my Zivan is providing 16 amps DC into the battery bank as measured on my XBM battery monitor. I just don't think the Dual Pro is providing all that much current into each battery and so seems to take much longer charging using the Honda. But, I have not as yet measured it. I don't think each charger in the Dual Pro would be capable of providing the 15 Amps dc you require for cruising. If it were to be used as a power supply for motoring. I welcome other comments on this from those who may know more about the Dual Pro and it's circuitry.
Capt. Mike
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From: Samuel Shallard <sshallard@maine.
Sender:
Date: Wed, 21 Jul 2010 21:26:07 -0400
To: <
ReplyTo:
Subject: Re: [Electric Boats] Wiring issue
I also have a Honda EU 2000 and had been wondering how it would work if I plugged the Dual Pro into it when operating the boat to provide for extended cruising time. It sounds like you have done that with the Zivan. Have you done it with the Dual Pro? I always have a fear of blowing something up but thought it should work. Electricity is not my strong suite and I am probably the last person that should be building and running an electric boat.
From what I understand the draw rate with the Dual Pro is around 10 amps at 110 Volts and I typically cruise pulling 15 amps on my 48 Volt bank?
On Jul 21, 2010, at 8:25 AM, Capt. Mike wrote:
I have two different battery charging systems on board. I have the 48 volt ZIVAN NG--1 that plugs into the controller to charge the whole bank. I also added a Dual Pro PS-4 that charges each individual battery. I'm finding they both have their uses on board. With the ZIVAN and the Honda 2000 generator I can push my boat at about 3 knots without drawing any current from the battery. I bought the Dual Pro because I was concerned about the balancing issue of the individual batteries. For reasons I have not yet fully explored it seems to me that the ZIVan seems to charge the bank faster than the Dual Pro. This would not be a problem when connected to the grid at a dock. But, since I'm usually on a mooring or at anchor. Generator running time is more of a concern. My plan is to now use the ZIVAN to bulk charge the bank. Once it switches to the second stage (pulse) charging I will switch to the Dual Pro to balance the pack.
Capt. Mike
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From: Samuel Shallard <sshallard@maine.
Sender:
Date: Wed, 21 Jul 2010 06:07:28 -0400
To: <
ReplyTo:
Subject: Re: [Electric Boats] Wiring issue
Interesting discussion and one I went through when I put my system together.
When I was planning my installation I had this same discussion with the engineer's at DualPro and Lifeline batteries. Initially the Lifeline response was that I could not do it, Dual Pro we do it all the time. I finally managed to get the two parties to communicate and they agreed that no disconnect was needed. What in part was interesting was that I was talking to two electrical engineers who deal with batteries and charging systems for the livelihood.
I have been operating the system this way for several years now-I leave the charger connected year round when I am not boating - and everything seems to operate flawlessly. I see no noticeable change in my home power consumption either
On Jul 21, 2010, at 5:25 AM, hardy71uk wrote:
Not so . providing the 48 volt line is switched off and the charger output does not share a common earth with the 48 volt pack its quite ok to charge each 12 volt battery one at a time with a single charger without splitting the pack into 12 volt units.
Modern chargers are often fully floating ( earth free) but some may be earthed to the line power plug . In that case be sure that the the 48 volt pack is not earthed back to the line plug earth too.
Chris S
--- In electricboats@
>
>
> Charging your bank with a single 12V charger requires that you disconnect the bank into 12V sections before charging. Trying to charge pieces of the bank while connected doesn't work well. In this case, the uncharged batteries pull current from the charging battery causing the charger to sense a higher load than the battery that it is hooked to. This causes the charger to continue pushing high current after the target battery is close to full. This leads to higher heat and wear on the target battery.
>
> Let me know if you need any additional info.
>
> Fair winds,
> Eric
>
>
>
>
> --- In electricboats@
> >
> > I am sure there are folks more knowledgeable that I but I would think
> > you have multiple options.
> > I have 4 12 volts wired in series 48 Volt system and use a single
> > DualPro 4 bank charger. It charges each battery separately even
> > though the batteries remain wired in series. It is probably the Rolls
> > Royce system but operationally is foolproof and all I do is connect
> > the power cord. It pulls around 10 amps max.
> > The cheapest way would be to have a single bank charger and switch
> > from battery to battery as each one charges.
> > On Jul 20, 2010, at 6:17 PM, adamgoforth7701 wrote:
> >
> > > I have a boat that i am looking at that is not charging. It is a 48
> > > volt system. It has two banks of 24volts (4 6v batteries). How to i
> > > charge all batteries off of one charger?
> > >
> > >
> >
>
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