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Unread 01-09-2018, 10:05 PM
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Power Budget Spreadsheet?

Does anyone have a sample power budget spreadsheet they would be willing to share to calculate the expected battery capacity left at the end of a normal match headed into end game. I understand that the result varies based on robot operations during the match and current draw for each operation. I would expect to plug in our operations and draw characteristics to tweak to our situation.
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Unread 01-10-2018, 01:28 AM
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Re: Power Budget Spreadsheet?

The amount of battery you have remaining is SO dependent on match and robot variables that such a sheet would have little basis in reality. The best way to do this is experimentally.
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Unread 01-10-2018, 04:44 AM
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Re: Power Budget Spreadsheet?

If for some strange reason you do need to know the battery capacity at the end of any match, given a known battery capacity, you could integrate the current being drawn out of the battery (which is data that the PDP provides) and determine how many Ah is remaining (and thus energy), but again, no idea what this could be useful for. Keep in mind the Ah listed on the battery are probably going to be off by a certain amount (due to manufacturing variance and battery wear), may be significant, may be negligible, depends on the application.
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Unread 01-10-2018, 11:08 PM
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Re: Power Budget Spreadsheet?

As described, remaining power is dependent on what the bot does during the match and how much drain each of those operations might have. We are trying to assess design tradeoffs as we strategize and model to avoid making choices that aren't feasible on the field.

To be a little more specific, one of the calculations might be how many CIMS and how much battery power would be needed at the end of the match to lift 400 lbs 12 inches in the air in 5 seconds. Lots of ways to do this, some more feasible than others.

If we decide to be a fast scale bot with an elevator to be able to lift cubes 6 feet in the air we could potentially estimate the current draw for a given cycle based on our drivetrain design, power calculations for the elevator lifter, etc. If we decide to be a switch guard, then we might have shorter cycles and would have to have a shorter lift mechanism.

I saw recommendations in some of the threads on preventing brownouts to make a power budget but didn't see any examples as a reference so thought I'd ask specifically for an example if anyone has one.
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