love the idea and i've been looking for a motor that could generate as well.... especially nice in terms of redundancy as one spare would cover both functions.... haven't yet found a motor/gen that i really like and suggestions are very welcome
From: robert m <jennonpress@hotmail.com>
To: electricboats@yahoogroups.com
Sent: Tuesday, April 10, 2012 4:10 AM
Subject: RE: [Electric Boats] Re: Carter...48v diesel battery charger information
hi, just a thought, may not work. how about using the drive motor as the generator. would need a couple clutches or the like to engage and disengage motor and prop.
To: electricboats@yahoogroups.com
From: mccomb.michael@yahoo.com
Date: Mon, 9 Apr 2012 18:41:04 -0700
Subject: [Electric Boats] Re: Carter...48v diesel battery charger information
From: Carter Quillen <twowheelinguy@yahoo.com>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Monday, April 9, 2012 7:17 PM
Subject: Re: [Electric Boats] Re: 48v diesel battery charger information
On 10/04/12 07:04, Eric wrote:
>
> Unfortunately, regardless of random member's analysis of why these units should be cheaper, I'm going to guess that any reliable marine DC generator in the 48V-144V range will be more expensive than an AC generator, primarily due to the limited demand and low production numbers. So I would expect that a Panda, Onan or Kohler AC genset of an equivalent kW output will be cheaper than what you'll find in DC or even what you'll be able to cobble together yourself.
>
> That's just my opinion, but I'm aiming to set realistic expectations. And think of how awesome it would be for all of us if you can prove me wrong...
>
48v DC is also 'Telco Voltage' and there will be a lot of kit around
for it. But Telco's expect and are prepared to pay for, very high
availablity - these gen sets are back up power that just 'has to work'.
So between 'it just has to work' level of engineering AND the 'it's for
a telco mark up', such kit is expensive. It will be absolutely bullet
proof, but expensive.
A DIY really should be cheaper - as you are targeting and entirely
lower level of engineering rigour.
Now you could argue that a marine system should be even tougher than a
Telco spec one - as lives might depend on that system reliably starting
and kicking in, but that's a whole other argument :-)
Now I use a Honda eu20 as backup on my boat - which by any marine
engineering standard is unsuitable for the job - between fumes and fuel
spill potential, but it works for me. (I've never had to use it 'in
anger' fortunately.) I'm aware of the risks and act accordingly. (Like
NOT starting it in the enclosed areas of the boat for starters)
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To: electricboats@yahoogroups.com
From: mccomb.michael@yahoo.com
Date: Mon, 9 Apr 2012 18:41:04 -0700
Subject: [Electric Boats] Re: Carter...48v diesel battery charger information
hey Carter...... do you have a favorite "internally regulated, 48V, 100 amp alternator"?
From: Carter Quillen <twowheelinguy@yahoo.com>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Monday, April 9, 2012 7:17 PM
Subject: Re: [Electric Boats] Re: 48v diesel battery charger information
The Honda EU series generators rock but Honda is proud of them too. And you have to have gas on the boat which is not as good as not having gas on the boat. I decided a while back that I don't want to carry gas on the boat anymore so I have been thinking about building a 48V diesel generator for a while now. I can tell you what I've decided for myself.
Kubota makes a nice 6.5 kW engine you can buy from thier dealers in the US. I've heard you can get them band new in the box from Japan for as cheap as $2000 but I'll believe that when I scrape together the money to actually go and buy one. It's the same one you see in some the high end ready made gensets. I already have two different internally regulated, 48V, 100 amp alternators and a keel cooler and dry stack in my engine room to connect to. You can get any kind of drive belt, pully,chain, or sprocket you need from USA Bearing in Lakeland Florida so I should be able to cobble the thing together for less than $3K. I'll let you know. But even if you have to buy an alternator or some other form of generator you should be able to put the thing together for under 5K.
Has anyone ever use a diesel or gas welder to drive a series hybrid or quick charge batteries?
Miller makes a nice little 10hp continuous duty unit you can get used for a couple thousand bucks. They even come in propane and you can dial them up to something like 200amps. Just a thought.
From: Matthew Geier <matthew@acfr.usyd.edu.au>
To: electricboats@yahoogroups.com
Cc: Eric <ewdysar@yahoo.com>
Sent: Monday, April 9, 2012 7:21 PM
Subject: Re: [Electric Boats] Re: 48v diesel battery charger information
To: electricboats@yahoogroups.com
Cc: Eric <ewdysar@yahoo.com>
Sent: Monday, April 9, 2012 7:21 PM
Subject: Re: [Electric Boats] Re: 48v diesel battery charger information
On 10/04/12 07:04, Eric wrote:
>
> Unfortunately, regardless of random member's analysis of why these units should be cheaper, I'm going to guess that any reliable marine DC generator in the 48V-144V range will be more expensive than an AC generator, primarily due to the limited demand and low production numbers. So I would expect that a Panda, Onan or Kohler AC genset of an equivalent kW output will be cheaper than what you'll find in DC or even what you'll be able to cobble together yourself.
>
> That's just my opinion, but I'm aiming to set realistic expectations. And think of how awesome it would be for all of us if you can prove me wrong...
>
48v DC is also 'Telco Voltage' and there will be a lot of kit around
for it. But Telco's expect and are prepared to pay for, very high
availablity - these gen sets are back up power that just 'has to work'.
So between 'it just has to work' level of engineering AND the 'it's for
a telco mark up', such kit is expensive. It will be absolutely bullet
proof, but expensive.
A DIY really should be cheaper - as you are targeting and entirely
lower level of engineering rigour.
Now you could argue that a marine system should be even tougher than a
Telco spec one - as lives might depend on that system reliably starting
and kicking in, but that's a whole other argument :-)
Now I use a Honda eu20 as backup on my boat - which by any marine
engineering standard is unsuitable for the job - between fumes and fuel
spill potential, but it works for me. (I've never had to use it 'in
anger' fortunately.) I'm aware of the risks and act accordingly. (Like
NOT starting it in the enclosed areas of the boat for starters)
------------------------------------
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