Help creating a formula to figure out cost.

[onlyname]

Alright, I am new here, I am going to try and explain this as well as I can.

I have a product that I paid 22.50 for. It was 280 watts with 1 rail at an efficiency level of 85. Now I have deduced the cost per watt, that was easy. However I am trying to find a constant (I guess). If I am paying .08036 per watt, how can I find if I am paying to much for a product. There are multiple levels of efficiency (85, 88, 90, etc) and you can have any number of rails (1,2,3, etc) that would come apart of the equation.

So, is there a constant that I can say, with x rail and at efficiency level x and x watts, this is what the price should be at.

I hope I explained this well. If you have any questions please ask. Thanks for your time.

 

[mmm4444bot]

is there a constant that I can say, with x rail and at efficiency level x and x watts, this is what the price should be at

I'm thinking that there is likely no constant, as you've described.

(By the way, you would need to use different symbols for the variables above, like x, y, and z.)

Are you talking power supplies? Not all power supplies with 1 rail, 85 efficiency, and 500 watts (for example) are equal. Component quality and workmanship are factors. I once saw an article titled something like "90 percent of all power supply reviews are flawed", and it discussed various ways how misinformation arises when comparing power supplies.

Frequently, one may not rely on manufacturer claims, either.

Are you concerned about things like signal noise or ripple in the output? Perhaps I misunderstand your intent regarding what the price "should be at", but I don't see how you can rank power-supply value based solely on x, y, and z.

Cheers :cool:

 

[onlyname]

I'm thinking that there is likely no constant, as you've described.

(By the way, you would need to use different symbols for the variables above, like x, y, and z.)

Are you talking power supplies? Not all power supplies with 1 rail, 85 efficiency, and 500 watts (for example) are equal. Component quality and workmanship are factors. I once saw an article titled something like "90 percent of all power supply reviews are flawed", and it discussed various ways how misinformation arises when comparing power supplies.

Frequently, one may not rely on manufacturer claims, either.

Are you concerned about things like signal noise or ripple in the output? Perhaps I misunderstand your intent regarding what the price "should be at", but I don't see how you can rank power-supply value based solely on x, y, and z.

Cheers :cool:

I was kind of worried that this would be the case. Could we assume that quality and workmanship do not come into play? Would that change the outcome? If we just assumed one buyer... I've had problems like this before, just not with so many variables, haha.

To hopefully clear the misunderstanding. Essentially, I am trying to find a should cost. I have what I paid for the product, but I don't have a should cost based on the market. See where opportunities are.

So, if I cant base it on x,y and x. How else would I view it?

Thanks for your time.