Best way to get 12s

[rad35]

If i use 4 3s 5000mah 70c packs in series is that better than 2 6s 5000 70c packs in series. Question being if i series packs does the mah stay at 5000 or does it change to 10'000. Or is that only on parallel wireing?

[T.S.Davis]

Both your scenario produce 12s5000mah. The pair of 6s should/could have less actual wire so less ripple current feeding your ESC. Ripple current eats speedo.

12s is a lot of voltage. If your experience is limited I wouldn't recommend messing with that much power.

[rad35]

I am setting up a large cat with 5680 tp motors 650 kv so i figured 12s to run this using 300 amp esc and cap bank and anti spark setup all 8mm bullet connectors. I have 6s packs allready that i use in my other boat in parallel so thought i would stay with them. Is there other things i am not covering to do a setup this way? will make all my wireing as short as possible. looking for any info as ya i don't know it all.

[T.S.Davis]

I didn't wanna be a weenie about the 12s thing. It's doable but dangerous too.

Worth getting in touch with Keith from Keithbradley boats. He's done a number of really big kitties like you're talking about. He's right here in MI too if you haven't already heard of him.

[rad35]

Not at all taken that way i appreciate any help. i am being told i need to look at doing higher volts and less kv for this sooo don't know. have heard of keith read his post's but have not talked to him. just trying to get my duck in a row before starting this project if you know what i mean LOL.
thanks again no offence taken.
to get a hold of keith do i pm him or?

[kfxguy]

The ideal thing to do is run two 6s packs per motor for a total of (4) 6s packs. If you have the room, you didn't say the size of this cat so large could mean from 40" to 92". I WOULD NOT run just 5000mah between both of those big motors, that's definitely not enough capacity and amperage for two big motors.

[rad35]

The boat is 92in. the batterys i was looking at are revolectrics 6s 5000mah packs 4 total for both motors. they show 6s 5800mah packs would those be better they are there silver label packs.

[rad35]

I have room so would there be an advantage to running pair's other than more run time.

[rad35]

I have room so would there be an advantage to running pair's other than more run time.

[Lone-Wolf]

I run 12S2P/side on my MHZ 1850 -73" Cat (4x6S packs/motor). I would definitely run 2P for each motor (10,000ma), so total of 8x 6S packs in the boat counting both motors! With my boat I am getting less than 5 minutes of runtime and I usually bring her in when I hit the 4 minute mark with this setup even with a conservative prop like ABC 2215's or 57mm 2-blades...these big hulls need a ton of juice. If you don't run 2P/sside you will only get 2 minutes of runtime with 5000ma's in your hull, pretty sad. Also, if you don't run 2P you'll stress the batteries pretty bad and if you get anywhere near depleting those packs they will be toast. Lastly, you'll want lots of weight up front anyways to keep the bow flat, another final reason to run lots of packs.

[rad35]

Ok i can do 8 6s 5800 packs not a problem do you think the 5680 tps are good

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[Fluid]

One non-technical consideration, you may have zero insurance running more than 10S since that is the maximum for IMPBA and NAMBA. That may seem unimportant, but if your boat causes damage or injury, you may be totally responsible and have to pay all damages. In today's litiginous society it is often better safe than sorry. Just IMHO, if you have no valuables to lose then perhaps it doesn't matter.



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[Lone-Wolf]

Ok i can do 8 6s 5800 packs not a problem do you think the 5680 tps are good

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I'm pretty confident in saying the TP 5680's would work well but can't say 100% for sure because I have never run those motors in a hull that size but they look like they can deliver the power you need. Personally I have had alot of success with TP motors in general in smaller boats up to 46", a really nice motor for a really good price. More importantly is it to keep in mind what Fluid just said about liability, a boat that size can cause alot of damage, heck a boat half that size can too! I get stressed out every time I run my big Cat and someone appears on the Beach close to the shore...it's a hair raising experiencing running a huge boat and certainly an adrenaline boost, in spite of this always try and think safety first no matter what.

[rad35]

fluid i totaly understand were you are coming from on that. i am allready checking on liabillity ins. i am not looking to run this boat at high speed more of a novelty or sport setup 50-60 mph. I do understand unexpected things will happen. mostly will be running at my house on lake huron no people around at6-7 in the morning LOL. point well made appreciate it.
lone-wolf might this run on 10s per side with 800 kv instead of 650 or not much difference rpm works out to about the same but what about battery life amp draw and such any thought's.

[Fluid]

Actually after looking at the thread again, since the boat is over 60" the insurance wouldn't cover it anyway, so you might as well rum 12S to keep the amps down. I am glad to hear that you are considering insurance coverage, a wise move. A boat almost 8 feet long can do a LOT of damage even going "just" 60 mph.


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