Doubling the batt Mah = longer run time?

[Tony]

Guys. Is this true if i double the batt Mah as in parallel lipo set up would result in longer run time? Ok, for a 6S1P 5000mAh 25C i would get about 4-5min. So, by doubling it , i would get 8-10 min?

[sailr]

hypothetically, yes. By wiring two packs in parallel, you double the mAh. Think of the amp capacity as a fuel tank. The bigger the tank, the longer the run.

There is another PLUS by increasing the amps. It will also give you better performance. The increased amps PUSH the volts through faster!

[sjslhill]

I think you have some of that backwards, the higher voltage is better. Less voltage drop is due to double ability and less amps is needed.
Higher voltage = lower amps needed = less heat.
P=I.V
where,
P = power in watts
I = current in amperes
V = potential difference in volts
For example: 2 amperes × 12 volts = 24 watts.

Here is a good place for some calculations [url]http://www.sengpielaudio.com/calculator-ohm.htm[/url

[sailr]

You are talking about series, double the volts. That was NOT the guy's question. Your post is correct but not pertinent to his question. Let's help this guy out, not confuse him.

[sjslhill]

No I am not

That was not my intent....by running paralle you will have higher voltage and less amps. trust me.

thanks,
Steve

You are talking about series, double the volts. That was NOT the guy's question. Your post is correct but not pertinent to his question. Let's help this guy out, not confuse him.

[sailr]

EXCUSE ME!?

SERIES increases volts.
PARALLEL increases amps.

This is basic electricity! That was the only question he had. Yes, you will have more volts delivered when you increase the amps. More volts = lower amp DRAW but not less amps CAPACITY. More amps capacity = longer run times. THAT was his question.

That was not my intent....by running paralle you will have higher voltage and less amps. trust me.

thanks,
Steve

[properchopper]

A little off topic , but is there a way [formula ?] to calculate horsepower of brushless motors ?

[sailr]

If you can determine the watts you can compute the horsepower.

Watts = Volts X Amps. You know the volts by your battery pack. Finding the amps in a boat can be a challenge. You really need an on-board data collector like an Eagle Tree system to know exactly what the amps are during running. The amp draw in boats jumps up and down depending on the water conditions (prop in and out of the water in rough water, etc.) So the PEAK amps can't be simply collected without such a unit onboard the boat.

Here is the way to convert to horsepower. IF you know the watts:

To convert Watts (W) to a horsepower rating (HP) simply multiply the Watts by 0.00134

W x 0.00134 = HP

Another way that's simpler: 745.6999 watts = 1 HP

So if you have 3000 watts, you divide that by 745.6999 = 4.02+ HP

A little off topic , but is there a way [formula ?] to calculate horsepower of brushless motors ?

[properchopper]

Thanks.

[D. Newland]

Longer runtime = more heat buildup. The temps of your motor/esc/cells need to be monitored more closely when you run longer until you've got your setup dialed in.

[sjslhill]

By doubling the capacity you will have less voltage drop. You also have double the amp capability but unless you prop up, you will not draw more amps.
Yes you will run longer if you don't have a heat problem over the time period.
end of story.....

thanks,
Steve

[sailr]

Exactly!

By doubling the capacity you will have less voltage drop. You also have double the amp capability but unless you prop up, you will not draw more amps.
Yes you will run longer if you don't have a heat problem over the time period.
end of story.....

thanks,
Steve

[sailr]

Most of us that race, rather than just tooling around the pond, we only need to run for 2 or 3 minutes max to complete the 1 mile race. We can live with high temps for a very short period. But if you are just wanting to run a long time, you would be well advised to closely watch your temps as advised by David here.

Longer runtime = more heat buildup. The temps of your motor/esc/cells need to be monitored more closely when you run longer until you've got your setup dialed in.

[Steven Vaccaro]

Most of us that race, rather than just tooling around the pond, we only need to run for 2 or 3 minutes max to complete the 1 mile race.

I would like to challenge that statement. I find a major percentage of my customers back yard bash. Not that they wouldn't race, but there isnt any racing around them. One of my most heard email questions is how to get more runtime.

[sailr]

What are you challenging? I said most of us THAT RACE. I was just giving an example. I didn't say most people race. Read it again. I know most are back yard bashers. Did you read the thread? I think I gave the guy some pretty good answers? Excuse me for participating!

I would like to challenge that statement. I find a major percentage of my customers back yard bash. Not that they wouldn't race, but there isnt any racing around them. One of my most heard email questions is how to get more runtime.