Battery Runtime is the first app I ever released public. It was designed and developed back in 2012 when I first started coding and updated to swift in 2013. I was self taught and just needed an app to function. I made this app to help my co-workers and customers with central office DC power work. Debating with myself to remove this app from the app store or update it to make the UI and functionality more professional. If any of the users of BRT don't want to see the app go away please feel free to email me from the contact us page.
This is the home screen of BRT. From here you can go to the wire size calculator or the battery run time calculator.
In this example we've entered the total number of amp hours for all the strings of batteries the plant has added together and the desired run time of the plant.
This is the result from the BRT example. The max allowable amps for the entered run time is 135. If you entered the current load on the plant BRT would have returned the number of hours the plant would run with the 600 amp hours of batteries entered.
In this example we've selected DC/Single phase, tin coated copper, and 6 awg wire.
We've entered 30 feet, 100 amps and 48 volts being this example is based on a -48V dc plant.
The result isn't acceptable. A 3 volt drop is too much so we need to tap the Selectors button on the top of the view and pick a bigger wire size.
We've selected 2 awg and then selected the green check mark to dismiss the selector view.
Press enter on the calculator and the new result displays. 1.206 volt drop is still a little high but might be acceptable depending on the specs of the job.