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General Category => General Discussion => Topic started by: jimj on March 27, 2016, 12:48:12 PM

Title: power rating versus ampere rating
Post by: jimj on March 27, 2016, 12:48:12 PM
Hello,

   Whenever I read the specs for a charge controller, the units are amps.
Since controllers can usually be configured for different output battery levels, e.g., 12, 24, 48, do I deliver more power using a higher battery voltage setup?
   If I use 12vdc and the max current is 50 amps, and the power is 50A x 12VDC =600W, do I calculate the output max for a 48VDC battery system as 50A x 48VDC = 2.4kW?

Thank you,
J
Title: Re: power rating versus ampere rating
Post by: TomW on March 27, 2016, 01:17:01 PM
Jim;

That is indeed true.

Power (Watts) is Amps multiplied by Volts.

Title: Re: power rating versus ampere rating
Post by: jimj on March 27, 2016, 02:13:24 PM
You missed the point.
I read your caveat.
Thanks for the warning.
Title: Re: power rating versus ampere rating
Post by: Westbranch on March 27, 2016, 04:10:32 PM
Yes you will deliver more power, and as Tom said A x V gives you the total.
Title: Re: power rating versus ampere rating
Post by: TomW on March 27, 2016, 05:37:46 PM
Quote from: jimj on March 27, 2016, 02:13:24 PM
You missed the point.
I read your caveat.
Thanks for the warning.

How so?

It is a basic, electricity 101 question. I did not check your math but the formula is absolute and correct. Watts equals volts times amps so yes you can shove more power through at 48 volts compared to 12 volts with same ampere rating.

Just how it is.

Tom