Need help calculating amp

[Tony]

Hi guys. Will somebody help me figure out if the batttery i'm getting will have enough amp to run this boat or not. This will be a 6S setup boat.

Boat: H&M Maritimo 37" catamaran
Motor: Feigao 580 10L 1,326 RPM / Volt
ESC: Seaking/Turnigy 180amp
Prop: x646 or x445, x447
Battery: Turnigy/Zippy 2X 3S1P 5000mAh 25C (series)

Should i run this as series or parallel?

[NorthernBoater]

You will need to run that as 6s1p. 3s will not get you the rpms you need.

[ghostofpf1]

fecalc says about 100 amps on 6s with the x445 prop so your 180 should be plenty even if fecalc were off by a good margin .You should always run a lap or two and then bring in any new boat to check equipment temps.
good luck
Steve

[Tony]

You will need to run that as 6s1p. 3s will not get you the rpms you need.

2x 3s1p series will make this a 6s

[Tony]

fecalc says about 100 amps on 6s with the x445 prop so your 180 should be plenty even if fecalc were off by a good margin .You should always run a lap or two and then bring in any new boat to check equipment temps.
good luck
Steve

Steve,
thanks for the info. So i take that 25C will be ok. I would like to increase to 30C in the future for larger prop?

[Fluid]

The ESC is not the problem - the 25C cells may be marginal in that application. While their nominal output is 125 amps, it is best practice not to exceed 80% of that - which is 100 amps. That is a pretty big boat for 2000 watts but if you stay conservative you may be just fine. I'm really just suggesting caution, not doom. The purest soution is 2P, not a cheap one, but clearly better than just upgrading to 6S1P/30C.

Examples:
6S1P/5000mAh/30C = 150 amps max - 120 amps at 80%
6S2P/5000mAh/25C = 250 amps max - 200 amps at 80%

That boat is plenty large enough for 2P.



.

[Tony]

The ESC is not the problem - the 25C cells may be marginal in that application. While their nominal output is 125 amps, it is best practice not to exceed 80% of that - which is 100 amps. That is a pretty big boat for 2000 watts but if you stay conservative you may be just fine. I'm really just suggesting caution, not doom. The purest soution is 2P, not a cheap one, but clearly better than just upgrading to 6S1P/30C.

Examples:
6S1P/5000mAh/30C = 150 amps max - 120 amps at 80%
6S2P/5000mAh/25C = 250 amps max - 200 amps at 80%

That boat is plenty large enough for 2P.



.

Fluid,
Thanks for the inputs. For future batt upgrade would be something like 2X 3s2p 5000mah 30C series. Wouldn't this total 6S = 300 amps max?