You folks have me totally confused here....

I have it figured that a 350 watt or so continuous draw unit will turn a
tool that is 3 amp, and maybe a 3.5 amp, but it could smoke out if used
long.

Basically a 100 watt unit for every 1 amp draw.

They do sell bigger ones, but they start getting expensive fast.

My 350 continuous has two 115V outlets each separately fused with heavy
wires and alligator clamps for hookup direct to the battery.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

JimG wrote:
>
> Problem is, 30 amps on the 110 volt side would be 275 amps on the 12 volt
> side (assuming 100% efficient). You could run small tools though, I don't
> know about a welder. Best bet would be to mount the inverter very close to
> dual batteries using large gauge, short lengths of cable.
>
> JimG
>
> "Paul Calman" <spam@trap.com> wrote in message
> news:bqnv7r$24vouj$1@ID-87669.news.uni-berlin.de...
> > > For that unit you would need about 300 watts from the inverter, that's
> > about
> > > 25 amps on the 12 volt side. It could work.
> >
> > I was thinking 3300 Watts would carry 30 Amps at 110V AC
> > http://www.the12volt.com/ohm/page2.asp allowing me to use my mini-mig, or
> a
> > sawzall too. I figure on the Jeepster i can easily put an air tank under
> > the floorboards in front of the rear axle, and put the compressor under
> the
> > hood.
> >
> > --
> > Paul Calman, Hathaway Pines, California
> >
> >

 

You folks have me totally confused here....

I have it figured that a 350 watt or so continuous draw unit will turn a
tool that is 3 amp, and maybe a 3.5 amp, but it could smoke out if used
long.

Basically a 100 watt unit for every 1 amp draw.

They do sell bigger ones, but they start getting expensive fast.

My 350 continuous has two 115V outlets each separately fused with heavy
wires and alligator clamps for hookup direct to the battery.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

JimG wrote:
>
> Problem is, 30 amps on the 110 volt side would be 275 amps on the 12 volt
> side (assuming 100% efficient). You could run small tools though, I don't
> know about a welder. Best bet would be to mount the inverter very close to
> dual batteries using large gauge, short lengths of cable.
>
> JimG
>
> "Paul Calman" <spam@trap.com> wrote in message
> news:bqnv7r$24vouj$1@ID-87669.news.uni-berlin.de...
> > > For that unit you would need about 300 watts from the inverter, that's
> > about
> > > 25 amps on the 12 volt side. It could work.
> >
> > I was thinking 3300 Watts would carry 30 Amps at 110V AC
> > http://www.the12volt.com/ohm/page2.asp allowing me to use my mini-mig, or
> a
> > sawzall too. I figure on the Jeepster i can easily put an air tank under
> > the floorboards in front of the rear axle, and put the compressor under
> the
> > hood.
> >
> > --
> > Paul Calman, Hathaway Pines, California
> >
> >

 

Your example is inline with what I have said (although it is closer to 110
watts per amp; Watts = Amps * Volts ). I think what is overlooked is the
current draw on the 12 volt DC side. Watts are watts on either side
(assuming 100% efficiency, most units are more like 90%). So, a 350 watt
inverter would draw nearly 30 amps from the battery at full load; Amps =
Watts / Volts).

JimG

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FCFB109.682877A1@sympatico.ca...
> You folks have me totally confused here....
>
> I have it figured that a 350 watt or so continuous draw unit will turn a
> tool that is 3 amp, and maybe a 3.5 amp, but it could smoke out if used
> long.
>
> Basically a 100 watt unit for every 1 amp draw.
>
> They do sell bigger ones, but they start getting expensive fast.
>
> My 350 continuous has two 115V outlets each separately fused with heavy
> wires and alligator clamps for hookup direct to the battery.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> JimG wrote:
> >
> > Problem is, 30 amps on the 110 volt side would be 275 amps on the 12
volt
> > side (assuming 100% efficient). You could run small tools though, I
don't
> > know about a welder. Best bet would be to mount the inverter very close
to
> > dual batteries using large gauge, short lengths of cable.
> >
> > JimG
> >
> > "Paul Calman" <spam@trap.com> wrote in message
> > news:bqnv7r$24vouj$1@ID-87669.news.uni-berlin.de...
> > > > For that unit you would need about 300 watts from the inverter,
that's
> > > about
> > > > 25 amps on the 12 volt side. It could work.
> > >
> > > I was thinking 3300 Watts would carry 30 Amps at 110V AC
> > > http://www.the12volt.com/ohm/page2.asp allowing me to use my
mini-mig, or
> > a
> > > sawzall too. I figure on the Jeepster i can easily put an air tank
under
> > > the floorboards in front of the rear axle, and put the compressor
under
> > the
> > > hood.
> > >
> > > --
> > > Paul Calman, Hathaway Pines, California
> > >
> > >

 

Your example is inline with what I have said (although it is closer to 110
watts per amp; Watts = Amps * Volts ). I think what is overlooked is the
current draw on the 12 volt DC side. Watts are watts on either side
(assuming 100% efficiency, most units are more like 90%). So, a 350 watt
inverter would draw nearly 30 amps from the battery at full load; Amps =
Watts / Volts).

JimG

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FCFB109.682877A1@sympatico.ca...
> You folks have me totally confused here....
>
> I have it figured that a 350 watt or so continuous draw unit will turn a
> tool that is 3 amp, and maybe a 3.5 amp, but it could smoke out if used
> long.
>
> Basically a 100 watt unit for every 1 amp draw.
>
> They do sell bigger ones, but they start getting expensive fast.
>
> My 350 continuous has two 115V outlets each separately fused with heavy
> wires and alligator clamps for hookup direct to the battery.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> JimG wrote:
> >
> > Problem is, 30 amps on the 110 volt side would be 275 amps on the 12
volt
> > side (assuming 100% efficient). You could run small tools though, I
don't
> > know about a welder. Best bet would be to mount the inverter very close
to
> > dual batteries using large gauge, short lengths of cable.
> >
> > JimG
> >
> > "Paul Calman" <spam@trap.com> wrote in message
> > news:bqnv7r$24vouj$1@ID-87669.news.uni-berlin.de...
> > > > For that unit you would need about 300 watts from the inverter,
that's
> > > about
> > > > 25 amps on the 12 volt side. It could work.
> > >
> > > I was thinking 3300 Watts would carry 30 Amps at 110V AC
> > > http://www.the12volt.com/ohm/page2.asp allowing me to use my
mini-mig, or
> > a
> > > sawzall too. I figure on the Jeepster i can easily put an air tank
under
> > > the floorboards in front of the rear axle, and put the compressor
under
> > the
> > > hood.
> > >
> > > --
> > > Paul Calman, Hathaway Pines, California
> > >
> > >

 

Your example is inline with what I have said (although it is closer to 110
watts per amp; Watts = Amps * Volts ). I think what is overlooked is the
current draw on the 12 volt DC side. Watts are watts on either side
(assuming 100% efficiency, most units are more like 90%). So, a 350 watt
inverter would draw nearly 30 amps from the battery at full load; Amps =
Watts / Volts).

JimG

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FCFB109.682877A1@sympatico.ca...
> You folks have me totally confused here....
>
> I have it figured that a 350 watt or so continuous draw unit will turn a
> tool that is 3 amp, and maybe a 3.5 amp, but it could smoke out if used
> long.
>
> Basically a 100 watt unit for every 1 amp draw.
>
> They do sell bigger ones, but they start getting expensive fast.
>
> My 350 continuous has two 115V outlets each separately fused with heavy
> wires and alligator clamps for hookup direct to the battery.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> JimG wrote:
> >
> > Problem is, 30 amps on the 110 volt side would be 275 amps on the 12
volt
> > side (assuming 100% efficient). You could run small tools though, I
don't
> > know about a welder. Best bet would be to mount the inverter very close
to
> > dual batteries using large gauge, short lengths of cable.
> >
> > JimG
> >
> > "Paul Calman" <spam@trap.com> wrote in message
> > news:bqnv7r$24vouj$1@ID-87669.news.uni-berlin.de...
> > > > For that unit you would need about 300 watts from the inverter,
that's
> > > about
> > > > 25 amps on the 12 volt side. It could work.
> > >
> > > I was thinking 3300 Watts would carry 30 Amps at 110V AC
> > > http://www.the12volt.com/ohm/page2.asp allowing me to use my
mini-mig, or
> > a
> > > sawzall too. I figure on the Jeepster i can easily put an air tank
under
> > > the floorboards in front of the rear axle, and put the compressor
under
> > the
> > > hood.
> > >
> > > --
> > > Paul Calman, Hathaway Pines, California
> > >
> > >

 

It is fused on each plug with a 25 amp fuse.

The bigger units must do some other conversion somewhere or have really
big fuses which is possible. The cables on mine could draw 50 or 60
amps easy.

You need a good battery and alternator to draw that large for long
though.

Mike

JimG wrote:
>
> Your example is inline with what I have said (although it is closer to 110
> watts per amp; Watts = Amps * Volts ). I think what is overlooked is the
> current draw on the 12 volt DC side. Watts are watts on either side
> (assuming 100% efficiency, most units are more like 90%). So, a 350 watt
> inverter would draw nearly 30 amps from the battery at full load; Amps =
> Watts / Volts).
>
> JimG
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3FCFB109.682877A1@sympatico.ca...
> > You folks have me totally confused here....
> >
> > I have it figured that a 350 watt or so continuous draw unit will turn a
> > tool that is 3 amp, and maybe a 3.5 amp, but it could smoke out if used
> > long.
> >
> > Basically a 100 watt unit for every 1 amp draw.
> >
> > They do sell bigger ones, but they start getting expensive fast.
> >
> > My 350 continuous has two 115V outlets each separately fused with heavy
> > wires and alligator clamps for hookup direct to the battery.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > JimG wrote:
> > >
> > > Problem is, 30 amps on the 110 volt side would be 275 amps on the 12
> volt
> > > side (assuming 100% efficient). You could run small tools though, I
> don't
> > > know about a welder. Best bet would be to mount the inverter very close
> to
> > > dual batteries using large gauge, short lengths of cable.
> > >
> > > JimG
> > >
> > > "Paul Calman" <spam@trap.com> wrote in message
> > > news:bqnv7r$24vouj$1@ID-87669.news.uni-berlin.de...
> > > > > For that unit you would need about 300 watts from the inverter,
> that's
> > > > about
> > > > > 25 amps on the 12 volt side. It could work.
> > > >
> > > > I was thinking 3300 Watts would carry 30 Amps at 110V AC
> > > > http://www.the12volt.com/ohm/page2.asp allowing me to use my
> mini-mig, or
> > > a
> > > > sawzall too. I figure on the Jeepster i can easily put an air tank
> under
> > > > the floorboards in front of the rear axle, and put the compressor
> under
> > > the
> > > > hood.
> > > >
> > > > --
> > > > Paul Calman, Hathaway Pines, California
> > > >
> > > >

 

It is fused on each plug with a 25 amp fuse.

The bigger units must do some other conversion somewhere or have really
big fuses which is possible. The cables on mine could draw 50 or 60
amps easy.

You need a good battery and alternator to draw that large for long
though.

Mike

JimG wrote:
>
> Your example is inline with what I have said (although it is closer to 110
> watts per amp; Watts = Amps * Volts ). I think what is overlooked is the
> current draw on the 12 volt DC side. Watts are watts on either side
> (assuming 100% efficiency, most units are more like 90%). So, a 350 watt
> inverter would draw nearly 30 amps from the battery at full load; Amps =
> Watts / Volts).
>
> JimG
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3FCFB109.682877A1@sympatico.ca...
> > You folks have me totally confused here....
> >
> > I have it figured that a 350 watt or so continuous draw unit will turn a
> > tool that is 3 amp, and maybe a 3.5 amp, but it could smoke out if used
> > long.
> >
> > Basically a 100 watt unit for every 1 amp draw.
> >
> > They do sell bigger ones, but they start getting expensive fast.
> >
> > My 350 continuous has two 115V outlets each separately fused with heavy
> > wires and alligator clamps for hookup direct to the battery.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > JimG wrote:
> > >
> > > Problem is, 30 amps on the 110 volt side would be 275 amps on the 12
> volt
> > > side (assuming 100% efficient). You could run small tools though, I
> don't
> > > know about a welder. Best bet would be to mount the inverter very close
> to
> > > dual batteries using large gauge, short lengths of cable.
> > >
> > > JimG
> > >
> > > "Paul Calman" <spam@trap.com> wrote in message
> > > news:bqnv7r$24vouj$1@ID-87669.news.uni-berlin.de...
> > > > > For that unit you would need about 300 watts from the inverter,
> that's
> > > > about
> > > > > 25 amps on the 12 volt side. It could work.
> > > >
> > > > I was thinking 3300 Watts would carry 30 Amps at 110V AC
> > > > http://www.the12volt.com/ohm/page2.asp allowing me to use my
> mini-mig, or
> > > a
> > > > sawzall too. I figure on the Jeepster i can easily put an air tank
> under
> > > > the floorboards in front of the rear axle, and put the compressor
> under
> > > the
> > > > hood.
> > > >
> > > > --
> > > > Paul Calman, Hathaway Pines, California
> > > >
> > > >

 

It is fused on each plug with a 25 amp fuse.

The bigger units must do some other conversion somewhere or have really
big fuses which is possible. The cables on mine could draw 50 or 60
amps easy.

You need a good battery and alternator to draw that large for long
though.

Mike

JimG wrote:
>
> Your example is inline with what I have said (although it is closer to 110
> watts per amp; Watts = Amps * Volts ). I think what is overlooked is the
> current draw on the 12 volt DC side. Watts are watts on either side
> (assuming 100% efficiency, most units are more like 90%). So, a 350 watt
> inverter would draw nearly 30 amps from the battery at full load; Amps =
> Watts / Volts).
>
> JimG
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3FCFB109.682877A1@sympatico.ca...
> > You folks have me totally confused here....
> >
> > I have it figured that a 350 watt or so continuous draw unit will turn a
> > tool that is 3 amp, and maybe a 3.5 amp, but it could smoke out if used
> > long.
> >
> > Basically a 100 watt unit for every 1 amp draw.
> >
> > They do sell bigger ones, but they start getting expensive fast.
> >
> > My 350 continuous has two 115V outlets each separately fused with heavy
> > wires and alligator clamps for hookup direct to the battery.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > JimG wrote:
> > >
> > > Problem is, 30 amps on the 110 volt side would be 275 amps on the 12
> volt
> > > side (assuming 100% efficient). You could run small tools though, I
> don't
> > > know about a welder. Best bet would be to mount the inverter very close
> to
> > > dual batteries using large gauge, short lengths of cable.
> > >
> > > JimG
> > >
> > > "Paul Calman" <spam@trap.com> wrote in message
> > > news:bqnv7r$24vouj$1@ID-87669.news.uni-berlin.de...
> > > > > For that unit you would need about 300 watts from the inverter,
> that's
> > > > about
> > > > > 25 amps on the 12 volt side. It could work.
> > > >
> > > > I was thinking 3300 Watts would carry 30 Amps at 110V AC
> > > > http://www.the12volt.com/ohm/page2.asp allowing me to use my
> mini-mig, or
> > > a
> > > > sawzall too. I figure on the Jeepster i can easily put an air tank
> under
> > > > the floorboards in front of the rear axle, and put the compressor
> under
> > > the
> > > > hood.
> > > >
> > > > --
> > > > Paul Calman, Hathaway Pines, California
> > > >
> > > >

 

The fuses are typically sized to protect the internal wiring of the
inverter, and do not necessarily reflect output capability. If you short
the receptacle, the fuse would blow before the internal wiring would burn
up.

JimG

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FCFC0BA.CF71ECC0@sympatico.ca...
> It is fused on each plug with a 25 amp fuse.
>
> The bigger units must do some other conversion somewhere or have really
> big fuses which is possible. The cables on mine could draw 50 or 60
> amps easy.
>
> You need a good battery and alternator to draw that large for long
> though.
>
> Mike
>
> JimG wrote:
> >
> > Your example is inline with what I have said (although it is closer to
110
> > watts per amp; Watts = Amps * Volts ). I think what is overlooked is
the
> > current draw on the 12 volt DC side. Watts are watts on either side
> > (assuming 100% efficiency, most units are more like 90%). So, a 350
watt
> > inverter would draw nearly 30 amps from the battery at full load; Amps =
> > Watts / Volts).
> >
> > JimG
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:3FCFB109.682877A1@sympatico.ca...
> > > You folks have me totally confused here....
> > >
> > > I have it figured that a 350 watt or so continuous draw unit will turn
a
> > > tool that is 3 amp, and maybe a 3.5 amp, but it could smoke out if
used
> > > long.
> > >
> > > Basically a 100 watt unit for every 1 amp draw.
> > >
> > > They do sell bigger ones, but they start getting expensive fast.
> > >
> > > My 350 continuous has two 115V outlets each separately fused with
heavy
> > > wires and alligator clamps for hookup direct to the battery.
> > >
> > > Mike
> > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > 88 Cherokee 235 BFG AT's
> > >
> > > JimG wrote:
> > > >
> > > > Problem is, 30 amps on the 110 volt side would be 275 amps on the 12
> > volt
> > > > side (assuming 100% efficient). You could run small tools though, I
> > don't
> > > > know about a welder. Best bet would be to mount the inverter very
close
> > to
> > > > dual batteries using large gauge, short lengths of cable.
> > > >
> > > > JimG
> > > >
> > > > "Paul Calman" <spam@trap.com> wrote in message
> > > > news:bqnv7r$24vouj$1@ID-87669.news.uni-berlin.de...
> > > > > > For that unit you would need about 300 watts from the inverter,
> > that's
> > > > > about
> > > > > > 25 amps on the 12 volt side. It could work.
> > > > >
> > > > > I was thinking 3300 Watts would carry 30 Amps at 110V AC
> > > > > http://www.the12volt.com/ohm/page2.asp allowing me to use my
> > mini-mig, or
> > > > a
> > > > > sawzall too. I figure on the Jeepster i can easily put an air
tank
> > under
> > > > > the floorboards in front of the rear axle, and put the compressor
> > under
> > > > the
> > > > > hood.
> > > > >
> > > > > --
> > > > > Paul Calman, Hathaway Pines, California
> > > > >
> > > > >

 

The fuses are typically sized to protect the internal wiring of the
inverter, and do not necessarily reflect output capability. If you short
the receptacle, the fuse would blow before the internal wiring would burn
up.

JimG

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FCFC0BA.CF71ECC0@sympatico.ca...
> It is fused on each plug with a 25 amp fuse.
>
> The bigger units must do some other conversion somewhere or have really
> big fuses which is possible. The cables on mine could draw 50 or 60
> amps easy.
>
> You need a good battery and alternator to draw that large for long
> though.
>
> Mike
>
> JimG wrote:
> >
> > Your example is inline with what I have said (although it is closer to
110
> > watts per amp; Watts = Amps * Volts ). I think what is overlooked is
the
> > current draw on the 12 volt DC side. Watts are watts on either side
> > (assuming 100% efficiency, most units are more like 90%). So, a 350
watt
> > inverter would draw nearly 30 amps from the battery at full load; Amps =
> > Watts / Volts).
> >
> > JimG
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:3FCFB109.682877A1@sympatico.ca...
> > > You folks have me totally confused here....
> > >
> > > I have it figured that a 350 watt or so continuous draw unit will turn
a
> > > tool that is 3 amp, and maybe a 3.5 amp, but it could smoke out if
used
> > > long.
> > >
> > > Basically a 100 watt unit for every 1 amp draw.
> > >
> > > They do sell bigger ones, but they start getting expensive fast.
> > >
> > > My 350 continuous has two 115V outlets each separately fused with
heavy
> > > wires and alligator clamps for hookup direct to the battery.
> > >
> > > Mike
> > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > 88 Cherokee 235 BFG AT's
> > >
> > > JimG wrote:
> > > >
> > > > Problem is, 30 amps on the 110 volt side would be 275 amps on the 12
> > volt
> > > > side (assuming 100% efficient). You could run small tools though, I
> > don't
> > > > know about a welder. Best bet would be to mount the inverter very
close
> > to
> > > > dual batteries using large gauge, short lengths of cable.
> > > >
> > > > JimG
> > > >
> > > > "Paul Calman" <spam@trap.com> wrote in message
> > > > news:bqnv7r$24vouj$1@ID-87669.news.uni-berlin.de...
> > > > > > For that unit you would need about 300 watts from the inverter,
> > that's
> > > > > about
> > > > > > 25 amps on the 12 volt side. It could work.
> > > > >
> > > > > I was thinking 3300 Watts would carry 30 Amps at 110V AC
> > > > > http://www.the12volt.com/ohm/page2.asp allowing me to use my
> > mini-mig, or
> > > > a
> > > > > sawzall too. I figure on the Jeepster i can easily put an air
tank
> > under
> > > > > the floorboards in front of the rear axle, and put the compressor
> > under
> > > > the
> > > > > hood.
> > > > >
> > > > > --
> > > > > Paul Calman, Hathaway Pines, California
> > > > >
> > > > >