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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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OT - 12 V. DC to AC "Automotive" Inverter
People on this group seem to have a lot of experience with stuff like
this, so I though I'd ask... I'm going to buy a DC-to-AC inverter to run a small blower off a 12 volt battery, along with one or two other small motors occasionally. It's all light-duty stuff -- no more than a single ~1/8 horsepower motor at a time (but they will go for up to 8 hours or so). I really don't know much about these inverters. Is there a particular brand any one would recommend? Are some are particularly inefficient, or have other problems I should watch out for? Thanks, ~Jeff Polaski |
#2
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OT - 12 V. DC to AC "Automotive" Inverter
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#4
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OT - 12 V. DC to AC "Automotive" Inverter
Some of the cheap inverters have a wave form that is a really bad
version of a sine wave. This makes no difference to the average 120 volt motor (synchronous or brushed) or lights but can play hob with computer power supples. Most of the small inverters can take some overload so if you size the inverter for 50% to 75% of your continuous load, you should have no problems. This assumes you are talking about a 3.3" form factor (diameter) motor. If you were trying to start a bigger motor eg 1/3 hp, you will need much more reserve capacity. A single 1/8 hp motor will take a theoretical 93 watts, figure 120 watts minimum for a real world motor. 10 amps out from your motor means 11 to 12 amps input to the inverter from your battery. This will kill a standard car battery in the 4 to 6 hour range. wrote: People on this group seem to have a lot of experience with stuff like this, so I though I'd ask... I'm going to buy a DC-to-AC inverter to run a small blower off a 12 volt battery, along with one or two other small motors occasionally. It's all light-duty stuff -- no more than a single ~1/8 horsepower motor at a time (but they will go for up to 8 hours or so). I really don't know much about these inverters. Is there a particular brand any one would recommend? Are some are particularly inefficient, or have other problems I should watch out for? Thanks, ~Jeff Polaski |
#5
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OT - 12 V. DC to AC "Automotive" Inverter
According to :
People on this group seem to have a lot of experience with stuff like this, so I though I'd ask... I'm going to buy a DC-to-AC inverter to run a small blower off a 12 volt battery, along with one or two other small motors occasionally. It's all light-duty stuff -- no more than a single ~1/8 horsepower motor at a time (but they will go for up to 8 hours or so). I really don't know much about these inverters. Is there a particular brand any one would recommend? Are some are particularly inefficient, or have other problems I should watch out for? Is there any reason why you must use 120 VAC motors for the purpose? Why not look into DC motors, which will work without the need for conversion. Since the conversion is not 100% efficient, this means that you will get more life from the battery with a properly sized DC motor. Now -- if it needs to run from AC as well -- what about a 12V power supply to run the motors when you are not running from the battery. And as others have already pointed out - you will probably need more than a single battery to run it for the required time. Good Luck, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#6
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OT - 12 V. DC to AC "Automotive" Inverter
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