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+--- Thread: 24 Volt (/showthread.php?tid=2413)
Pages: 1 2
24 Volt - Jay Darst - 04-17-2006 15:13
The calc for amps at 110 volts to amps at 12 volts-
say 15 amps at 110V = 15 x 110 = 1,650 watts
1,650 watts divied by 12volts = 137.5 amps(at 12V)
because inverters are, at best, about 92% efficient, ya need to
divide the 137.5amps by 92% efficiency, you'll get 149.5 amps (at
12V) to run a 15 amp/110V load.
Fortunately, the roof tops only draw about 12.5 amps at 110V, so-
12.5 x 110 = 1,375watts divided by 12V = 114.6amps divied by 92%
efficiency = 124.5 amps at 12V
Throw in a bit of curve now.
My alternator is actually 14 volts, so the equation looks like this:
12.5 x 110 = 1,375watts divided by 14V = 98.2amps divided by 92%
efficientcy = 106.75 amps at 14V to run my front A/C. Pretty easy
for the 14volt/320amp alternator. Plus the inverter likes to have
plenty of voltage/amperage to convert to 110V, makes it work not so
hard ;~}
Jay Darst
85PT40
Springfield, IL
--- In WanderlodgeForum@yahoogroups.com, "Chuck Wheeler"
>
> Just remember that to provide 15amps at 24 volts will require your
generator
> to provide about 83 amps at 24 volts or about 170 amps at 12 volts
in
> addition to the load it is currently carrying.
>
> - Chuck Wheeler -
> 82 FC 31 SB
> Fort Worth, TX
>
> -----Original Message-----
> From: WanderlodgeForum@yahoogroups.com
> [mailto:WanderlodgeForum@yahoogroups.com] On Behalf Of
putneyflash@...
> Sent: Sunday, April 16, 2006 7:52 PM
> To: WanderlodgeForum@yahoogroups.com
> Subject: Re: [WanderlodgeForum] 24 Volt
>
>
> Blair: could you run the fron ta/c off the inverter by tapping
into the
> correct leg? seems that would work better than having the dash a/c
repaired
> and converted from 12 to 134
>
> re brake FC-35SB albany, ga. "sagecoach"
>
> -------------- Original message from Blair
> --------------
>
>
> Lee, the Outback's are the best in the business and I sell all
types.
> Blair in Oregon
>
>
>
> At 05:57 PM 4/15/2006, you wrote:
> >Hi electricians, My iota charger had an unfortunate encounter
with a
> >welding outlet and I am in the market for a new one. One thing
leads
> >to another and I am now looking at running the front A/C off an
> >inverter for those minor cooling days without the generator.
Then I
> >looked at the currents and now am considering going to and LN 24v
> >alternator(maybe 130A at 24V) and an outback VFX3524M inverter.
It
> >looks to me like I could hook the inverter to one of the 30 amp
legs
> >and put the inverter loads there and that way the existing
selector
> >switch would still work as isolation for the 50 amp and gen use?
> >
> >I have read through the writeup by
> ><http://ourodyssey.blogspot.com/>http://ourodyssey.blogspot.com/
but
> >I don't want THAT much automation. I think the 24v bus would be
an
> >asset for a future solar addition also.
> >
> >Any thoughts on 24V?
> >
> >Lee Benson, 85FC35, Carthage, IN
> >
> >
> >
> >
> >
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24 Volt - indynotjones - 04-18-2006 01:57
--- In WanderlodgeForum@yahoogroups.com, "Jay Darst"
wrote:
>
> My brother Dan has a 1986 FC35RB with the 3208 and a 320amp Leece
> NeVille Alternator. The 160 and 320 use exactly the same mounting
> hardware with no modifications at all- NONE.
>
I looked at one just superficially at the repair shop the other day.
It sure looked bigger. I am on my way over there today. It sure
doesn't look like there is much room around the Motorola that is
there now.
> You will need to change the cable that runs to the alternator as
the
> factory stuff is 1 gage, we replaced ours with 1/0 cable. This can
> be a big PITA on the FC's, pretty easy on the PT.
>
As I think and read it seems that this is the real issue. I already
have the 1/0 and 2/0 cable so that expense is not an issue. Those
sizes are a real bear to work with, let alone threading it around a
greasy frame. That was why I was looking at 24v to start with. I
guess it boils down to the work to change cable v.s. the expense of a
vanner DC-DC converter and all the other stuff to add a 24V bus.
> The 320 amp unit is $1,500 new. Buy a take off(from ambulance or
> fire truck) on E-Bay.
>
The shop has a new one on the shelf, $1,000. I am not sure I need to
go all the way to 320 A.
>
>
Too many variables. This is too much thinking for an old retired guy.
At least it is not cold anymore so I have some time before I have to
worry about getting a Proheat although that is in the back of my mind
when looking at pumps, etc (12 vs 24).
Lee Benson, 85FC35, Carthage, IN