On Wed, 7 Mar 2012 03:04:16 +0000 (UTC), gregz
wrote:

"Stormin Mormon" wrote:
volts times amps equals watts.
120 x 10 = 1200.

Larger inverter than that may be needed. Keep the 12 volt cables as fat,
and as short as possible. Run more 110 volt AC power cord if you need to.

Christopher A. Young
Learn more about Jesus
www.lds.org
.

"Herb Eneva" wrote in message
...
I would like to know what size inverter would be required to run an
electric chain saw that uses 120 volts and 10 amps.
I have some trees down in the woods that I need to cut up. I can get the
tractor to them and would like to know what size inverter ( how many
watts) do I need to run the saw.
Thanks for any info
Herb

1200 watts divided by 12 volts = 100 amps. 120 ahr battery = less than one
hour operating time. What kind of tractor? If that's big enough, you still
need a couple thousand rpm.

Greg

You don't want to have the tractor stuck in the woods with a dead
battery.
When I was looking into them to power my furnace and some lights from
an inverter in case of a power outage, the biggest issue was my car
alternator.
It's the stock 100 amps, but I still don't know what engine rpm that's
based on.
A tractor probably has a lower amp alternator.
That's the weak spot.
You're not going to run a tool long on a single battery without the
alternator going.
10 amps is a pretty heavy draw on a battery.
Anyway, I decided hooking up a small gas space heater was easier and
more cost efficient.
There's some power loss with inverters, and they need heavy wiring and
lugs..
Best place to get first hand advice on them is RV and contractor
forums.
I noticed some contractors use them to run power tools at job sites.
Those are probably mostly hooked to pickup trucks with 100 amp or
better alternators.
I'm with those who say get a small gas generator or a gas saw.
But if you can pick up a 2000W inverter cheap, give it a go.

--Vic