Digest for sci.electronics.repair@googlegroups.com - 11 updates in 3 topics

9:40 AM Penedão
Hilda Winkler <hildawinkler77@gmail.com>: Jul 21 03:15PM -0700

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 ..???
Rheilly Phoull <rheilly@bigslong.com>: Jul 22 07:57AM +0800

On 22/07/2021 6:15 am, Hilda Winkler wrote:
> 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 ..???
 
What size battery ?
Hilda Winkler <hildawinkler77@gmail.com>: Jul 21 06:38PM -0700

On Wednesday, July 21, 2021 at 7:57:41 PM UTC-4, Rheilly Phoull wrote:
> On 22/07/2021 6:15 am, Hilda Winkler wrote:
> > 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 ..???
 
> What size battery ?
 
12v hooked up directly to the terminals..
Rheilly Phoull <rheilly@bigslong.com>: Jul 22 10:05AM +0800

On 22/07/2021 9:38 am, Hilda Winkler wrote:
>>> 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 ..???
 
>> What size battery ?
 
> 12v hooked up directly to the terminals..
 
As in ampere hours, can you measure the battery voltage when the load is
connected ?
Rheilly Phoull <rheilly@bigslong.com>: Jul 22 10:09AM +0800

On 22/07/2021 10:05 am, Rheilly Phoull wrote:
 
>> 12v hooked up directly to the terminals..
 
> As in ampere hours, can you measure the battery voltage when the load is
> connected ?
 
Bearing in mind that at those levels, the battery will need to supply
several hundred amps for the motor to run.
Hilda Winkler <hildawinkler77@gmail.com>: Jul 22 03:35AM -0700

On Wednesday, July 21, 2021 at 10:09:56 PM UTC-4, Rheilly Phoull wrote:
> > connected ?
> Bearing in mind that at those levels, the battery will need to supply
> several hundred amps for the motor to run.
 
 
Tested 12.4v before the load, 12.3 with the load,.
Phil Allison <pallison49@gmail.com>: Jul 22 03:39AM -0700

hildawi...@gmail.com wrote:
----------------------------------------------------
<
>> .... the battery will need to supply
> > several hundred amps for the motor to run.
 
> Tested 12.4v before the load, 12.3 with the load,.
 
** Wot load ?
 
You said the vac did not run.
 
 
 
..... Phil
Rheilly Phoull <rheilly@bigslong.com>: Jul 22 10:30PM +0800

On 22/07/2021 6:39 pm, Phil Allison wrote:
 
> ** Wot load ?
 
> You said the vac did not run.
 
> ..... Phil
 
Yeah, like Phil said ??
"Peter W." <peterwieck33@gmail.com>: Jul 22 08:39AM -0700

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
N_Cook <diverse@tcp.co.uk>: Jul 22 08:10AM +0100

On 19/07/2021 16:54, N_Cook wrote:
> lens. Just trying out a pan of water , shrouded against false returns,
> to check out over 20 metres initially. For real over tidal water comes
> later.
 
I'm way off trying to use this SPI coding , and I'm no codesmith , but
for anyone else landing here, there may be an error in the
7segment/decimal conversion block
 
else if(c == 0x3F) decimal[i] = '0';
else if (c == 0x06) decimal[i] = '1';
else if (c == 0x6D) decimal[i] = '2';
else if (c == 0x4F) decimal[i] = '3';
else if (c == 0x56) decimal[i] = '4';
else if (c == 0x5B) decimal[i] = '5';
else if (c == 0x7B) decimal[i] = '6';
else if (c == 0x0E) decimal[i] = '7';
else if (c == 0x7F) decimal[i] = '8';
else if (c == 0x5F) decimal[i] = '9';
 
The hex 6D and 5B may need swapping around for the '2' and '5'
 
--
Global sea level rise to 2100 from curve-fitted existing altimetry data
<http://diverse.4mg.com/slr.htm>
bruce bowser <bruce2bowser@gmail.com>: Jul 21 11:16AM -0700

On Wednesday, July 21, 2021 at 2:10:33 PM UTC-4, bruce bowser wrote in alt.home.repair:
 
> > >-- https://www.zoro.com/leviton-receptacle-duplex-20a-5-20r-125v-white-cr20-w/i/G3837374/feature-product?utm_source=google&utm_medium=surfaces&utm_campaign=shopping%20feed&utm_content=free%20google%20shopping%20clicks&gclid=CjwKCAjwi9-HBhACEiwAPzUhHN1aeMWrf55qsUBQ3ZHvrWnhINUsWGnhs_7QFx7XMobaImvzxZflLRoCDSQQAvD_BwE
> > I don't think so. It's own url and label include 125V.
> At peak or non-peak? Here in the 21st century we are designed to go over and under you know.
 
Plus, The left prong port has a horizontal port for 220 VAC 15-20A or for 120 VAC 15-20A.
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