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Bob, a power inverter question

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Forum topic by lwllms posted 11-26-2011 02:19 AM 806 views 0 times favorited 6 replies Add to Favorites Watch
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lwllms

555 posts in 2748 days


11-26-2011 02:19 AM

I’m thinking about an inverter for my truck and wondering what I should know. I’d like to run a few portable power tools. Mostly 6 to 8 amp stuff but it’d be nice to run a circular saw that draws about 12 amps. Tell me if I’m crazy or if it’s not a problem.


6 replies so far

View Dennisgrosen's profile

Dennisgrosen

10850 posts in 2582 days


#1 posted 11-26-2011 02:40 AM

Larry are you talking about 110Volts or 220Volts tools

Dennis

Edit : 110 Volt X 12 Amp = 1320 Watt
220 Volt X 12 Amp = 2640 watt
and that is what you need to come out of the inverter ... I will recoment a few extra battery´s
not starter battery´s becourse they are developed to give alots of power in short time
you need the other type you can draw power from over a longer period
and you need a splitter on the charger cable so its your starter battery that get charged first
thats how they set it up on boats if you are near a boat seller or service place they can help you out
on this very easy

take care
Dennis

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Dallas

3599 posts in 1954 days


#2 posted 11-26-2011 02:56 AM

Remember, V x A = P (expressed as watts).

For a 120V saw that draws 12A running, you’ll need 1440 watts, not to mention that the draw on the battery will be 120 amps. Then add in another 20% because of inherent inefficiency in cheaper inverters, plus a MSW inverter, (the lower priced ones you’ll find) may or may not cause problems with the universal motor because of too few steps in it’s wave form, which will be expressed as heat in the motor. Then there is starting load amps that can be two or three times running amps.

I wouldn’t go less than a 2000-2500 watt inverter with a 4000 – 5000 watt surge capacity.

Also think about your alternator. Is it large enough to keep up with the amperage draw?

I install inverter, solar and generator systems as my side line and can give you a definitive answer…. your not crazy, but I caution you to educate yourself on the differences in quality inverters and cheap inverters. MSW isn’t always a drawback, after all, a “True Sine Wave” inverter is merely a Modified Sine wave inverter with more steps to it’s wave form.

Good Luck!

DF

-- Improvise.... Adapt...... Overcome!

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TopamaxSurvivor

17674 posts in 3142 days


#3 posted 11-26-2011 06:01 AM

I would prefer a generator if you are going to run them much. What was said above, plus I would use a RV or marine deep cycle battery as the primary connection point especially if I were gong to run the 12 amp saw.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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Dennisgrosen

10850 posts in 2582 days


#4 posted 11-26-2011 06:10 AM

thank´s Topa
I cuoldn´t remember the right word for the battery´s

Dennis

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TopamaxSurvivor

17674 posts in 3142 days


#5 posted 11-26-2011 06:40 AM

I know the name too well ;-)) I just put 2 monsters in my 5th wheel for about $500! ;-(( I could have put in bigger, but did not really want to spend any more.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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lwllms

555 posts in 2748 days


#6 posted 11-26-2011 04:05 PM

Thanks. I mostly wanted to use an electric pole saw to clear low-hanging branches on the long drive way to the shop. UPS and truckers don’t like coming in the way it is. It looks like it’ll be a lot easier and less expensive to just buy a gas powered pole saw for the shop and keep the old electric one at home.

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