1. I have bought a low cost ac-dc charger from China. It is from 220Vac/50Hz to 54.6Vdc/20V charger.
It dont have any manual or wiring diagram with it. It has five connections: Line,Netrual & earth on input. On output it has thick terminals for V+ & Ground.

2. At output 54.6Vdc/20A, wattage is 1092W. How to calculate what is the exact wire & its size I should use. I have to charge a battery, so have to make red & black wire with clips myself. But what wire size(AWG) should I buy.

3. Similarly at input, it is 220Vac/50hz. Output is 1092W, consider charger is 75% efficient (though there is no manual, I am cosindering this as worst case), power at input will be: 1092W/0.75 = 1456W.
For this which wire should I use?

Is there any calculator to calculate?


1. For dc, I found below:
http://www.solar-wind.co.uk/cable-sizing-DC-cables.html


2. For ac & dc
http://www.powerstream.com/Wire_Size.htm
But this is not for exact dc. need to select AWG first.


Got idea from these two. But any more info on this also?

 

You found calculators for wire inside a steel cabinet. Is that where you will permanently install this machine?

 

Hi,
What type and size of battery you will charge. And where it is use for...

Anyway you for ac line input wire you can use size no.16 while on dc side size 20 or 22.

Try it without any calculation

 

You use a chart of resistance and the max. current you have.

Get ohms per foot and estimate resistance from the length you choose and multiply that by amps. The answer is the voltage drop you will have with that wire size. You want less than 10% of rated voltage. 5.46 volts is to much in your case.
Example
If your cables are .05 ohms each. Then resistance is .10 ohms.
.1 ohms times 20 amps is 2 volts dropped. (1 volt across each cable)

 

1. I have bought a low cost ac-dc charger from China. It is from 220Vac/50Hz to 54.6Vdc/20V charger.
It dont have any manual or wiring diagram with it. It has five connections: Line,Netrual & earth on input. On output it has thick terminals for V+ & Ground.

2. At output 54.6Vdc/20A, wattage is 1092W. How to calculate what is the exact wire & its size I should use. I have to charge a battery, so have to make red & black wire with clips myself. But what wire size(AWG) should I buy.

3. Similarly at input, it is 220Vac/50hz. Output is 1092W, consider charger is 75% efficient (though there is no manual, I am cosindering this as worst case), power at input will be: 1092W/0.75 = 1456W.
For this which wire should I use?

Is there any calculator to calculate?


1. For dc, I found below:
http://www.solar-wind.co.uk/cable-sizing-DC-cables.html


2. For ac & dc
http://www.powerstream.com/Wire_Size.htm
But this is not for exact dc. need to select AWG first.


Got idea from these two. But any more info on this also?

You really need to make a calculation? Go to Ace Hardware and ask your "helpful hardware girl".
How precise a calculation can you make? How many options are there?

Hi,
What type and size of battery you will charge. And where it is use for...

Anyway you for ac line input wire you can use size no.16 while on dc side size 20 or 22.

Try it without any calculation

DC aside, 14 AWG, TW or THHW copper, not aluminum. What is available where the OP is? Calculations aside, what can he get where he is at?

 

Hi,
What type and size of battery you will charge. And where it is use for...

Anyway you for ac line input wire you can use size no.16 while on dc side size 20 or 22.

Try it without any calculation

Do you mean 20A through a 22awg wire?

Here's one calculator, that includes a link to the table that the calculator is based on:

http://circuitcalculator.com/wordpress/2007/09/20/wire-parameter-calculator/