24 VDC appliances?
 

On Mon, 12 Jan 2004 06:42:21 GMT, Rick
wrote:

Just preference I guess, I have had my boat for about 7
years now and while it is big enough to have a couple of
gensets, an inverter, and a very large 120V battery bank I
love my propane stove and wouldn't give it up for anything.

=================================================

You're choice of course, but I'm not wild about having propane on a
boat, and the convenience of not having separate stove fuel to worry
about is kind of nice.

24 VDC appliances?
 

This is what I'm thinking too- if I have a large amount of electrical
connections anyway, why worry about a spark igniting a propane leak
somewhere in the bilge? Plus I have cruised in arribean a lot and
sometimes spent a whole day plus $50-100 on taxis to fillup $10 worth of
propane tanks. M


"Wayne.B" wrote:

On Mon, 12 Jan 2004 06:42:21 GMT, Rick
wrote:

Just preference I guess, I have had my boat for about 7
years now and while it is big enough to have a couple of
gensets, an inverter, and a very large 120V battery bank I
love my propane stove and wouldn't give it up for anything.

=================================================

You're choice of course, but I'm not wild about having propane on a
boat, and the convenience of not having separate stove fuel to worry
about is kind of nice.

24 VDC appliances?
 

This is what I'm thinking too- if I have a large amount of electrical
connections anyway, why worry about a spark igniting a propane leak
somewhere in the bilge? Plus I have cruised in arribean a lot and
sometimes spent a whole day plus $50-100 on taxis to fillup $10 worth of
propane tanks. M


"Wayne.B" wrote:

On Mon, 12 Jan 2004 06:42:21 GMT, Rick
wrote:

Just preference I guess, I have had my boat for about 7
years now and while it is big enough to have a couple of
gensets, an inverter, and a very large 120V battery bank I
love my propane stove and wouldn't give it up for anything.

=================================================

You're choice of course, but I'm not wild about having propane on a
boat, and the convenience of not having separate stove fuel to worry
about is kind of nice.

24 VDC appliances?
 

I agree. We actually will have the Spectra watermaker and these are extremely
efficient. I owned one for 5 years on a 31ft boat and with 5 people 2 120W solar
batteries are able to maintain it to provide enough water daily.

If we use spectra, the watermaker will consume approx the same amount of kwh as
the fridge.

We will have the generator as well

M

"Wayne.B" wrote:

On Sun, 11 Jan 2004 22:34:28 GMT, misia
wrote:

I agree electric heater might be the most energy hungry element, especially if
the water has to be retained and temperature maintained in the tank for 10
people onboard.

================================================== ====

To cruise with 10 people in the tropics, you're going to need a water
maker and lots of power. You might as well spring for a decent sized
generator with 110/220 volt power and not worry about finding 24 volt
appliances or stove fuel.

24 VDC appliances?
 

I agree. We actually will have the Spectra watermaker and these are extremely
efficient. I owned one for 5 years on a 31ft boat and with 5 people 2 120W solar
batteries are able to maintain it to provide enough water daily.

If we use spectra, the watermaker will consume approx the same amount of kwh as
the fridge.

We will have the generator as well

M

"Wayne.B" wrote:

On Sun, 11 Jan 2004 22:34:28 GMT, misia
wrote:

I agree electric heater might be the most energy hungry element, especially if
the water has to be retained and temperature maintained in the tank for 10
people onboard.

================================================== ====

To cruise with 10 people in the tropics, you're going to need a water
maker and lots of power. You might as well spring for a decent sized
generator with 110/220 volt power and not worry about finding 24 volt
appliances or stove fuel.

24 VDC appliances?
 

The exchanger you mention is the engine exhaust exchanger or engine cooling
system exchanger? Do you maybe have any links to practical solutions?

I have found 24V water heater heating elements which could be used as auxiliary.

Regards M



I came accross this Webasto heater:

http://www.navstore.com/pdf/webasto/Webasto%20TSL17.pdf

What do you think?

I did not check your link, but what you might want to ask your engineer for
would be a design for a water-to-water (Glycol based)heat exchanger to keep
your shower water HOT. This could be done with off-the-shelf electric
components if you have the space, and need only be configured to your space
by your architect and engineer. The electric would be your seldom-used
backup, and you could have your choice of 120, 240, or custom voltage
standard mount heating elements (check off-the-grid, solar, and wind power
resources for these items).

Rob
*
*
*

24 VDC appliances?
 

The exchanger you mention is the engine exhaust exchanger or engine cooling
system exchanger? Do you maybe have any links to practical solutions?

I have found 24V water heater heating elements which could be used as auxiliary.

Regards M



I came accross this Webasto heater:

http://www.navstore.com/pdf/webasto/Webasto%20TSL17.pdf

What do you think?

I did not check your link, but what you might want to ask your engineer for
would be a design for a water-to-water (Glycol based)heat exchanger to keep
your shower water HOT. This could be done with off-the-shelf electric
components if you have the space, and need only be configured to your space
by your architect and engineer. The electric would be your seldom-used
backup, and you could have your choice of 120, 240, or custom voltage
standard mount heating elements (check off-the-grid, solar, and wind power
resources for these items).

Rob
*
*
*

24 VDC appliances?
 

Steve Lusardi wrote:

If you use a water cooled muffler as a heat exchanger to heat your fresh
water, at some point your freshwater tank will be hot enough.

Just curious, no one mentioned using the exhaust waste heat
for domestic water heating. I have never seen such an
installation and suspect it is pretty rare since for the
reasons you mention it is a cumbersome means to avoid using
heat from the coolant.

Rick

24 VDC appliances?
 

Steve Lusardi wrote:

If you use a water cooled muffler as a heat exchanger to heat your fresh
water, at some point your freshwater tank will be hot enough.

Just curious, no one mentioned using the exhaust waste heat
for domestic water heating. I have never seen such an
installation and suspect it is pretty rare since for the
reasons you mention it is a cumbersome means to avoid using
heat from the coolant.

Rick

24 VDC appliances?
 

"misia" wrote in message
ail.from.there...
On my new boat I will have a powerfull 24VDC battery bank charged by a
diesel generator and auxiliary sources.

How powerful? Are you talking about a thousand amp-hours, or a hundred
thousand amp-hours? I can't imagin the cost, hassle and space rewquired for
the latter, but it is what you would need to provide what you are asking
about.


I did a bit of search but couldn't find much- are there any 24 VDC
appliances such as cooker/oven, fridge, AC and water heater you could
recommend?

In general, it is impracticle to use battery power for creating heat, i.e.,
stoves, ovens, water heaters, etc. It simply takes too much power for too
long to make it practical to store. Nevermind the voltage, it is more of an
issue of watt-hours.


I know I can run standard items through power inverter but I would
prefer not to do it for the sake of reliability/efficiency/cost.

Using the inverter, you have the reliability and cost of just one thing: the
inverter. After that, you can use very reliable and low cost 110 volt AC
appliances. To find 24 volt anything is going to be expensive, and the
bottom line is that DC motors are just not as reliable as AC motors, and
high current/low voltage is harder to work with (and thus less reliable)
than higher voltage/lower current.

I want
to go totally electric (no gas)

Then run your generator when you need the power, and use the batteries for
the small stuff.

A reasonable battery bank can run your lights, refrigerator, and through an
inverter you can run small appliances (such as a blender or short use of the
microwave), TV, stereo, computers, etc.

When looking for 24 volt equipment, take a look at commercial and "mega
yacht" sources. Lights shouldn't be a problem, but you may find that
electronics are scarce and very expensive. Since your battery bank is most
likely made up of a number of batteries in series, you could tap off a 12
volt line and have both a 12 volt and 24 volt system. Use the 24 volts for
the higher wattage stuff, such as the inverter, windlass and lights. Use
the 12 volts for the electronics, such as depth finders, VHF, etc.

Run the stove, water heater, and air conditioning off the generator.


Rod McInnis