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02-25-2013, 02:09 AM | #1 |
Not Yet Wild
Join Date: Dec 2012
Location: northern CA
Posts: 38
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A little help with the math, please
I would like to power an electric chainsaw (15A). So, I'm looking at converting 36 volts DC to 12 volts DC, then inverting 12 V DC to 110 V AC. I need to end up with 110 VAC, 3300 W peak, 1650 W continuous. Possible?
Thanks. |
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02-25-2013, 05:43 AM | #2 |
Gone Mad
Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
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Re: A little help with the math, please
That's a pretty big inverter, but I guess it's possible. The largest inverter I have is a 750 watt, and it's a big ole coil and core type and weighs a ton. I'm sure they have 'em. Just gotta Google for it, then see if your poor 36 volt to 12 volt converter/reducer is big enough.
If this is something you plan on doing a lot, maybe you should go straight from 36 volts to 120, and skip the 12 volt step. I'll bet folks who are doing solar, wind, etc. do this all the time. Also, JohnnyB will probably be along and offer better advice, but you may be able to power the chainsaw motor with DC, possibly giving you a more efficient dc to dc converter. Ever thought of buying a gas chainsaw? It may be cheaper in the long run, and even a cheap used one will run circles around an electric one. |
02-25-2013, 07:51 AM | #3 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: A little help with the math, please
It is possible, but it's not practical.
Even at 100% efficiency, an inverter will need 137.5A at 12VDC to produce 1650W at 120VAC and 275A at 12VDC to produce 3300W at 120VAC. There are some 36V cordless chainsaws out there and you might be able to feed them straight from the cart's battery pack, or power their charger via an inverter. A small (3.5KW) gasoline powered AC generator that could be carried in the bagwell might be the answer if you don't want to buy another chainsaw. |
02-25-2013, 10:18 AM | #4 | |||
Not Yet Wild
Join Date: Dec 2012
Location: northern CA
Posts: 38
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Re: A little help with the math, please
Quote:
Neighbors. Quote:
Quote:
Thanks guys. Figured you'd have some answers for me. |
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02-25-2013, 10:43 AM | #5 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: A little help with the math, please
Quote:
Other than a long heavy gauge extension cord or a gas powered generator, I have no other suggestions. |
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02-25-2013, 11:45 AM | #6 |
Astronautilator
Join Date: Sep 2011
Location: North Idaho
Posts: 1,494
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Re: A little help with the math, please
I know this will make me seem like a jack** and a D** but the thread title gave me an old thought of my child hood.
Sorry but I had to laugh. |
02-25-2013, 12:25 PM | #7 |
Respect the Cart
Join Date: May 2010
Location: Rocky Mount, Virginia
Posts: 2,190
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Re: A little help with the math, please
Here is an interesting video on the same subject. The chain saw part starts at 3:30
https://www.youtube.com/watch?v=zFYpNrbyKCA |
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