Output Max Amps

[erwin1991c]

What output current will I get if I have an input voltage of 700 volts at 1 amps and if I step the voltage down to 230 volts what would be the max amps I'll get.

 

[Kidsolo]

you can't get any more power out of it than you put in, minus your losses.

 

[Megawatt]

What output current will I get if I have an input voltage of 700 volts at 1 amps and if I step the voltage down to 230 volts what would be the max amps I'll get.

Erin to start with what are you wanting to put 700 volts in what to get 1amp I guess there’s not enough information

 

[erwin1991c]

A step down transformer

 

[Kidsolo]

Erin to start with what are you wanting to put 700 volts in what to get 1amp

input 700 volts, 1 amp, 700 watts
output 230 volts, 3 amps, 700 watts

 

[Megawatt]

Erin to start with what are you wanting to put 700 volts in what to get 1amp I guess there’s not enough information

Is it a 3 phase transformer and what’s the KVA rating of the transformer

 

[erwin1991c]

Didn't think about that yet. 700 volts at 1 amp is single phase using a generator. I want single phase 230 volts. I want to know what max amps I'll get if I want to step down to 230 volts. Please advise

 

[Megawatt]

Is it a 3 phase transformer and what’s the KVA rating of the transformer

What is your normal voltage
[automerge]1572310691[/automerge]

Didn't think about that yet. 700 volts at 1 amp is single phase using a generator. I want single phase 230 volts. I want to know what max amps I'll get if I want to step down to 230 volts. Please advise

So if you start your generator you get 700 volts
[automerge]1572310869[/automerge]

What is your normal voltage
[automerge]1572310691[/automerge]

So if you start your generator you get 700 volts

If you want to step down to 230 volts you will need a transformer
[automerge]1572311028[/automerge]

What is your normal voltage
[automerge]1572310691[/automerge]

So if you start your generator you get 700 volts
[automerge]1572310869[/automerge]

If you want to step down to 230 volts you will need a transformer

I’m curious where did you get a generator that puts out 700 volts

 

[erwin1991c]

I'll be connecting 100 motors in series (model of motor is 775 motor). All I know is that the winding of the month can handle around 1 amp current. Assuming 1 amp and 700 volts if I want to use a transformer to step it down to 230 volts what would be the max amps I'll get.

 

[Wilko]

Hi - if it was a perfect transformer with no losses its a simple calculation 700/235 Amps. As this transformer doesn’t exist you’ll get a bit less.

 

[DPG]

Out of interest why are you connecting 100 motors in series?

 

[Wilko]

Hi - if it was a perfect transformer with no losses its a simple calculation 700/235 Amps. As this transformer doesn’t exist you’ll get a bit less.

Oops, where’d that extra 5V come from?

 

[marconi]

erwin991c - the idea of connecting 100 motors in series is not a good one and fraught with danger. Could you say more about what you want to achieve?

 

[GeorgeCooke]

Didn't think about that yet. 700 volts at 1 amp is single phase using a generator. I want single phase 230 volts. I want to know what max amps I'll get if I want to step down to 230 volts. Please advise

Read post 5.

 

[static zap]

Series connection , may confuse voltages present in circuit ,
you can have a load present , but still exceed insulation capabilities else where !

 

[Megawatt]

Series connection , may confuse voltages present in circuit ,
you can have a load present , but still exceed insulation capabilities else where !

I got one question how do you wire 100 motors in series, I would think that would be impossible

 

[static zap]

I got one question how do you wire 100 motors in series, I would think that would be impossible

Anything is possible , but not necessarily a good design .
More points of failure ,
Labour to assemble ,
Hiding inefficiencies in multiple places = harder to measure !
( using whats available cheaply -adhoc .. feels like todays strategy )
--Rather dangerous if no earthing is present--

 

[Lucien Nunes]

Ignoring transformer losses, Vout/Vin = Iin/Iout.
1 x 700/230 = 3.0 as Kidsolo states above.
Also as above, devices rated for 7V each won't normally have insulation capable of withstanding 700V. They would need to be insulated from each other and from ground adequately.

However...

You mention motors, but they are seemingly being used as generators. I'm picturing 100 small moving parts driven by wind or water or something, from which you want to harvest the total output. If you want to transform the output of a series connected string of mini AC generators they must all be in phase; 100 randomly moving AC generators wired in series will give near zero output volts. If they are synchronous, they must be mechanically locked together (in which case you could use one large generator). If they are asynchronous, they will need to draw magnetising current from the AC supply; this works for a single induction generator but I can imagine chaos with a large number of units in series.

Small AC generators are very rare and specialised. Are you sure they are not small permanent-magnet motors? If so, the outputs will still be DC when used as a generator, and a transformer will not help you. One approach would be to series-connect them in blocks of say 48V, which is safe and their insulation will probably be OK with, then use DC-DC converters with paralelled outputs to convert up to a suitable bus voltage for a DC-input AC inverter.

Some significant electronics / generator knowledge will be needed to find an effective solution.

 

[PEG]

Hi,Are these "motors" being used as generators?
....is there wind or water involved?
[automerge]1572360666[/automerge]
Darn it....on silly phone,and never read luciens post?

 

[static zap]

A weak point for series DC , the same current flows thru all ,if they are not generating a matching current (at same instant) they will become motors again. wasting what others have made.
(before embarking on an expensive combiner -need to understand the dynamics of loading generators , add an individual load to each one ,and test if currents are in sync and can be combined )
Open circuit voltages mean little without a load !