Powering a 1200 w. Inverter directly from the Engines Alternator

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Dave in Lake Villa - 20 Jul 2006 02:50 GMT

I know someone who is doing this without any problems. It is fused at 30
amps. The Inverter powers his fridge using the 110 v. heating elements
within for better operation. (probably could use a 400 watt and get
by).

Is this method satisfactory, over tieing into the Coach Batterys. ?
The benefit is when he shuts off the engine for lunch at a restaurant or
for gasoline refills....he isnt draining the Coach Batteries and hes
not gone that long to where the fridge food spoils.

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Steve Barker LT - 20 Jul 2006 03:26 GMT

The output of the alternator is tied directly to the batteries. He's not
gaining anything unless he's going through an isolator diode setup.

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Steve Barker

>I know someone who is doing this without any problems. It is fused at 30
> amps. The Inverter powers his fridge using the 110 v. heating elements
[quoted text clipped - 5 lines]
> for gasoline refills....he isnt draining the Coach Batteries and hes
> not gone that long to where the fridge food spoils.

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SnoMan - 20 Jul 2006 06:07 GMT

>The output of the alternator is tied directly to the batteries. He's not
>gaining anything unless he's going through an isolator diode setup.

Actually it is not a good idea at all because altenator output has a
lot of hash on it and battery alse help sabilze the voltage and clean
up the hash some too. *the hash will appear in output and possible
shorter inverters life too under heavt load) BTW, a 1200 wat inverter
needs at least a 100 amp fuse too becaue it will draw more than 100
amps at 12 volt to make 1200 watts of output.
-----------------
The SnoMan
www.thesnoman.com

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Dave in Lake Villa - 21 Jul 2006 00:06 GMT

'BTW, a 1200 wat inverter needs at least a 100 amp fuse too becaue it
will draw more than 100 amps at 12 volt to make 1200 watts of output.
-----------------
The SnoMan'

REPLY: But what if youre using the 1200 w. Inverter with loads that pull
27 DC amps TOTAL ? (a small Fridge using 2 amps at 110 v. and a small
crockpot using .7 amps at 110 v) . Thanks.

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William Boyd - 21 Jul 2006 01:05 GMT

>'BTW, a 1200 wat inverter needs at least a 100 amp fuse too becaue it
>will draw more than 100 amps at 12 volt to make 1200 watts of output.
[quoted text clipped - 6 lines]
>
>

I have a 300amp main line fuse between my 1500watt inverter for my rv
system. The inverter has a dropout for overload and one for over or
under input dc. The fuse is just a short protection as the way I see it.
Both of my inverters work that way, to reset you just turn it off and
back on. The power indicator is either green or red.

--http://www.1stmob.com/s17.htm

BILL P.
Just
Me
&
DOG

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SnoMan - 21 Jul 2006 01:49 GMT

>'BTW, a 1200 wat inverter needs at least a 100 amp fuse too becaue it
>will draw more than 100 amps at 12 volt to make 1200 watts of output.
[quoted text clipped - 4 lines]
>27 DC amps TOTAL ? (a small Fridge using 2 amps at 110 v. and a small
>crockpot using .7 amps at 110 v) . Thanks.

Well I would not use a 1200 watt inverter then to begin with because
the efficency is best at or near max load and a 1200 watt unit with a
300 wat load will use more total power than a 500 watt one with the
same load.
-----------------
The SnoMan
www.thesnoman.com

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