Solar powered cement mixers

G

Gìmmìe Bobbie

Jan 1, 1970
0
The shipper may not want to even handle "dangerous goods" for any price with
acid in the batteries.
 
S

Steve Spence

Jan 1, 1970
0
At what voltage? giving amps at unknown voltage is useless. 1/4 hp
(187watts) at locked rotor, might pull 187 * 8, or 1500 watts max.

1500 watts / 120vac = 12.5 amps
1500 watts / 220vac = 6.8 amps
1500 watts / 12vdc = 125 amps


I wonder where your 35 amps came from?


BTW, a 1/4 hp condenser fan motor in a a/c unit has a full load amps
rated load of 1.12 amps, but locked rotor amps of 2.38 on single phase
220vac.

Steve Spence
Dir., Green Trust
http://www.green-trust.org

Contributing Editor
http://www.off-grid.net
http://www.rebelwolf.com/essn.html
 
G

Gìmmìe Bobbie

Jan 1, 1970
0
I thought it was fairly obvious but who knows what nonstandard system
USanians will dream up next...LOL

I guess you were talking 220v AC motor here.

OK... 120 vAC +/- 2 vAC sinesoidial waveform, measured less than 0.5%
distortion of any kind, using a 1/10 current shunt to measure using
Tectronic dual channel recording oscilliscope, switched with a copper blade,
spring loaded, snap action, open air switch. The source was via a 300 kVA
4.9% impedance, delta wye transformer from a 14kV 3000A dual fed bus by two
33MVA transformers from two 115kV transmission line systems = Jones Scheme.
14.2 % impedance at middle tap, reverse impedance tapchanger wound, ANSI
standard OFAF cooling.

No voltage sag was noticed due to the less than 100 m 500MCM copper
conductors feeding the building and the neutral connected to the massive <2
ohm ground grid in parallel with the neutral conductor returning to the
stations service transformers.

The 35 amperes was calculated by IR drop from the shunt mesaurement standard
tracable to the NBS calibration labs within the previous 12 months.

BTW Watts / AC voltage does not equate to any amps. Just plain bad physics.

Also
Locked rotor current depnds on many factors. What type of motor? split
phase, cap run, cap start, pole count, etc.. etc...

We measured a typical induction type furnace motor 1/4 horsepower used in
most places in N. America. It was tossed years ago so I couldn't tell you
the brand of manufacturer.
 
G

Gìmmìe Bobbie

Jan 1, 1970
0
I doubt AGM would matter, They contain acid and would be considered
"special" or "dangerous".

Check with shipping experts to be sure.
 
W

Windsun

Jan 1, 1970
0
And the correct spelling is "Tektronix"

">> BTW Watts / AC voltage does not equate to any amps...."
">> Tectronic dual channel recording oscilliscope...."

But I am sure that GB 'really' knows WTH he is talking about.

-------------------------------------------------------------------------------
 
W

wmbjk

Jan 1, 1970
0
On Thu, 24 Mar 2005 16:20:39 GMT, Steve Spence

sure likes to pretend he knows what he's talking about.

And he's able to respond to posters *after* he claims to have plonked
them. He must have ESP! Perhaps that's how he comes up with many of
his "facts" as well.

Wayne
 
A

Anthony Matonak

Jan 1, 1970
0
tater schuld wrote:
....
First, cement has been mixed for years with out the benefit of mechanical
asistance. with the use of a wheel barrow and a shovel. why try to build a
solar powered system for such a thing when manual labor can do the same,
possibly better?

I imagine because mechanical assistance is less work. That said, I
suppose an engine powered mixer is best for really remote work and
I wouldn't be a bit surprised if there are any number of PTO mixers
or adapters to hook up to the driven wheels of a truck.

In a pinch, I suppose animal powered mixers could be used.

Anthony
 
B

Bruce in Alaska

Jan 1, 1970
0
Steve Spence said:
doing footers for a 24' x 36' house in a wheelbarrow would be grueling.

Steve Spence
Dir., Green Trust
http://www.green-trust.org

There was a neighbor of mine who used local rock, sand, and gravel,
mixed with bagged cement, in a wheelbarrow and did a continious poor of
a complete daylight basement and 8ft walls on a 16'X24' cabin. He also
builtin all the mansonry for a double flue chimney with fireplaces in
the basement and first floor. The cabin is built out of local 10"
Spruce logs, set in place with a ginpole derrick, block & Tackle rig
using a local tree as a spar. No electrical devices, were used in any
of the construction.

A Picture of the cabin is on my website <www.99850.net)

Bert Stewart is a one of a kind guy, and this was the last cabin
in a series of cabins that he built over his lifetime. He also
doesn't believe in Gasoline engines, and rowed a dory 5 miles
down the Inlet every week to pick up his mail. One really tough old
bird. All that bagged cement was rowed up the inlet as well.......


Bruce in alaska
 
S

Steve Spence

Jan 1, 1970
0
They grow them tough up there .....

Steve Spence
 
P

Ptaylor

Jan 1, 1970
0
Bruce said:
There was a neighbor of mine who used local rock, sand, and gravel,
mixed with bagged cement, in a wheelbarrow and did a continious poor of
a complete daylight basement and 8ft walls on a 16'X24' cabin. He also
builtin all the mansonry for a double flue chimney with fireplaces in
the basement and first floor. The cabin is built out of local 10"
Spruce logs, set in place with a ginpole derrick, block & Tackle rig
using a local tree as a spar. No electrical devices, were used in any
of the construction.

A Picture of the cabin is on my website <www.99850.net)

Bert Stewart is a one of a kind guy, and this was the last cabin
in a series of cabins that he built over his lifetime. He also
doesn't believe in Gasoline engines, and rowed a dory 5 miles
down the Inlet every week to pick up his mail. One really tough old
bird. All that bagged cement was rowed up the inlet as well.......


Bruce in alaska

I think I saw a bit about him on PBS about a week or two ago..
He was a tough old bird indeed..
 
B

Bruce in Alaska

Jan 1, 1970
0
Ptaylor said:
I think I saw a bit about him on PBS about a week or two ago..
He was a tough old bird indeed..

don't know about PBS....but he is still around and kicking........
his wife passed away this winter, and he now travels around and visits
the kids and grandkids.......


Bruce in alaska
 
R

Richard P.

Jan 1, 1970
0
I think you may be thinking of Richard Proenneke. Google "One Man's Wilderness". That was an
awesome film.
 
G

George Ghio

Jan 1, 1970
0
tater schuld said:
I've been reading the replies and find myself a bit confused.

First, cement has been mixed for years with out the benefit of mechanical
asistance. with the use of a wheel barrow and a shovel. why try to build a
solar powered system for such a thing when manual labor can do the same,
possibly better?

The American syndrome.

Stick a motor on it, and if that does not work get a bigger motor.
 
Top