Useful Online Calculator Website

Looks interesting. Thank you.

Looks like it could be very useful. However, the links under "Select a Category" do not work; and it seems to be spotty in terms of saying what units to use.

For example: Under Battery calculator, one must assume the battery capacity is in AH, and the load is amps. Assumption is the mother of all F-ups.

But, Thank you, it appears to be a very useful tool.

"For example: Under Battery calculator, one must assume the battery capacity is in AH, and the load is amps. Assumption is the mother of all F-ups."

That particular calculator is missing more than just the labeling. It requires far more information to be of any use.

There is no information regarding final SOC of the battery, there is no input field for Manufacturer's C rating, no field for Peukert's constant, no field for battery age, no field for working temperature.

Presuming that it is referring to Lead Acid chemistry (there is no information on that either, and different chemistries will produce far different results), and that the load is in amps, then it's resultant numbers are so far off the mark that it is useless.

For instance, enter 100 Ah battery and 5 amp load, and it returns a result of 14 hours.

Being that most batteries are rated at the C20 rate (5 amp draw for 20 hrs for a 100 Ah battery), then the answer should be 20 hours. If it is calculating for an industry norm of minimum 50% SOC, then the answer should be 10 hours. If it is calculating for when the terminal voltage drops below the battery's rated voltage, then it should be 8 hours.

And it gets worse.. Enter 100Ah with 1 amp draw and the result is 70 hours where in reality it will be more than 100 hrs.

For other inputs it seems to be closer to 50% SOC with some results and closer to 0% SOC with others.

Still some work to do with that one.

Could be useful. How about adding something for Land Surveying?

Are your calculators as inaccurate as your spelling?

"...Are your calculators as inaccurate as your spelling?..."

opparently naught!

Hi calctown, please join us with more posts.

Looks like a great resource. I can imagine many hours, days or months went into it.

Remember most of the world is metric and maybe have an option of metric or imperial at the start and change the units accordingly. I found some calculators using both.

Again well done

Tony

Very nice, I'll add that to my list of calculator sites.

This looks like a massive endeavour: most sites dedicated to calculators just review and provide links to existing calculators, where this one seems to provide all the calculators itself with a similar user interface.

Congratulations and well done....... However there seem to be some strange anomalies. For example I didn't realise that if you inscribe a circle in a 3, 4, 5 right angled triangle it has a radius of 1: I've checked that, and, it's correct; but, where did you get the value of Pi to calculate the area and circumference?

OMG you've used 22/7 as the value of Pi.