DC - AC Power inverter

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hi group, why won't a 1.0 hp wet/dry vacuum cleaner model 2010. 120v 60hz 5.5a. Work on a 4000w 110v DC - AC Power inverter ..???

Re: DC - AC Power inverter
On 22/07/2021 6:15 am, Hilda Winkler wrote:
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What size battery ?

Re: DC - AC Power inverter
On Wednesday, July 21, 2021 at 7:57:41 PM UTC-4, Rheilly Phoull wrote:
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12v hooked up directly to the terminals..

Re: DC - AC Power inverter
On 22/07/2021 9:38 am, Hilda Winkler wrote:
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As in ampere hours, can you measure the battery voltage when the load is  
connected ?

Re: DC - AC Power inverter
On 22/07/2021 10:05 am, Rheilly Phoull wrote:
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Bearing in mind that at those levels, the battery will need to supply  
several hundred amps for the motor to run.

Re: DC - AC Power inverter
On Wednesday, July 21, 2021 at 10:09:56 PM UTC-4, Rheilly Phoull wrote:
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Tested  12.4v before the load, 12.3 with the load,.  

Re: DC - AC Power inverter
  snipped-for-privacy@gmail.com wrote:
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** Wot load ?  

 You said the vac did not run.  



.....  Phil

Re: DC - AC Power inverter
On 22/07/2021 6:39 pm, Phil Allison wrote:
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Yeah, like Phil said ??

Re: DC - AC Power inverter
Mpffff.

One Horsepower = 746 watts. For now, let's ignore the starting surge.  
746/110 = 6.78 Amps. That is the *AC* load for the motor when running.  
746/12 = 62.2 amps from the battery to make that load.

Now, consider the starting surge (typically six (6) times the running current).
That battery would need to put out +/-373 amps for the start.

This also ignores inverter losses (typically between 5 & 15% - 5% for a grid-tie type, 15% for most others).

The inverter may be rated at 4,000 watts. There are very, very few conventional automotive-type lead-acid batteries that could sustain it.  

Peter Wieck
Melrose Park, PA

Re: DC - AC Power inverter
snipped-for-privacy@gmail.com says...
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I have often wondered why there are inverters out that convert 12 volts  
to much over 1000 watts.  Even that is high, but it may take that to  
start the small motors or the input rush of other electronics.  

As you pointed out it takes a very large battery to provide that much  
power for very long.  If you are going to run an engine to keep  
thebattery charged, you might as well use a 120/240 volt generator in  
the first place.


Re: DC - AC Power inverter
On 23/07/2021 12:44 am, Ralph Mowery wrote:
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So Hilda there you have it, from multiple sources !!

Re: DC - AC Power inverter
 Ralph Mowery wrote:
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**  These supplies use " modified sine wave" aka variable pulse width rectangular waves.  

  The peak voltages are the same as the usual AC supply.  
  A lot of overload current could be avoided by having a "soft start" system.  

 The unit would need a "start" button that brings up the duty cycle of the output wave from zero over a few seconds.  


.....   Phil  

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