Additional cap packs for ESC

[emilwilkens]

Dear All,
I recently bought a Dynamite 160A 4-8S Brushless Waterproof Marine ESC (DYNM3880) and wanted to hear if you have any recommendations in regards to the addition of potential capacitor banks in front of the battery for this season?
I am using the ESC in my TFL Pursuit, with a 4082 1450KV motor running 8s batteries (2x 3Ah Turnigy Graphene Panther 4s in series).

I can see that the ESC has 3x Rubycon 35V 1000uf ZLH capacitors on the PCB right at where the DC input is - would it make sense to add some more?

- My goal is to increase longevity and performance

Looking forward for some good inputs on this topic. :)

Cheers

[Fluid]

Kv is very high for 8S. What is the purpose of the build, zip/zip runs, oval racing, general sport running? A 160 amp controller is marginal if you overprop even slightly. The battery capacity is low for such a setup, what is the “C” rating on the celks? Caps can help longevity but they can’t compensate for a poor setup. Zero measurable performance advantage.
.

[emilwilkens]

8s on 1450kv is nothing crazy? People are running 2200kv on 6s which is much greater rpm... ?
I am using 75C Graphene Panther batteries, which should be the best a man can get.
160A on 8s is a huge amount of power, i dont understand why you say it is too little. I believe the motor is rated at max 100amps since it is made to be running such high voltage. 100amps on 8s is 2960watts btw.

The setup is supposed to be used for speed runs and sport running. :)

Cheers

[larryrose11]

A little math
4.2V*8*1450 = 48720 RPM. a bit hot. Most systems don't like more than 39000 RPM.
The prop is what determines the load on a system. The ratings is what they can handle, not what they will deliver.
With only 160A available in the ESC, you run the risk of smoking it with too big of a propeller.

As for Cap banks, read this
https://forums.offshoreelectrics.com...light=cap+bank

[martin]

In a boat you can probably draw double the amperage in spikes than the max rated amp draw stated by the manufacturer.

[martin]

I'll take a punt that you are possibly using a Turnigy 4082 - 1450 kv motor.

[emilwilkens]

I am using the Turnigy 4082 yes :) what size prop will smoke it then? And what size ESC/MOTOR would you recommend then?
I do appreciate your concern, but the question regarding cap banks are yet to remain...? Also, what about 35V caps when using 8s, the Dynamite esc has 35V caps installed, but is rated for 8s which is kinda close...?

Cheers

[emilwilkens]

Btw, i did do a 60+mph run with a 42mm prop and the esc was not even warm to the touch.

[Fluid]

You ask for help - then argue with those who try to give you advice......

Please see post #2 for the answer to your question.

.

[photohoward1]

Don't complain when it goes poof. BTW. Thats a lot of RPM stress on the drive line even if the electronics don't smoke. Do you run teflon? If you do its a bitch to get out when it twists and melts at 50K....Let us know how it works out.

[emilwilkens]

Such a positive vibe you guys are bringing :)

I had no idea 50k RPM would be that big of a deal, but I will let you know how my system performes over the next few months, or, if according to you, the kaboom experiece i will shortly encounter. 😂🔥

Thanks for your inputs, you can look forward to some YT links with a burning pursuit filled with twisted and melted teflon (the answer to your question is yes). :P

Cheers fellas

[StevenBryant]

Such a positive vibe you guys are bringing :)

I had no idea 50k RPM would be that big of a deal, but I will let you know how my system performes over the next few months, or, if according to you, the kaboom experiece i will shortly encounter. [emoji23][emoji91]

Thanks for your inputs, you can look forward to some YT links with a burning pursuit filled with twisted and melted teflon (the answer to your question is yes). :P

Cheers fellas

My advice would be to change the caps to 50v for 8s, 35v is just too close for my liking, the extra caps I would use Rubicon 50v540Uf ZLH, use between 6 and 9 caps.

The esc I’m my experience is too low in amp rating for the motor and voltage, too keep the esc from burning up keep the prop small and measure temps on each run before going up in size on the props.

My advice would be to run a minimum of 200amp esc, the SF200 8s is a good esc or for more money the MGM25035-3 lite is a great esc.

50k is serious rpm for a mono, your setup will pull 43k rpm loaded, i rum 50k rpm is straight line SAW boats.

Good luck


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[larryrose11]

On cap banks, you should read this:
https://forums.offshoreelectrics.com...emptive-answer

[emilwilkens]

My advice would be to change the caps to 50v for 8s, 35v is just too close for my liking, the extra caps I would use Rubicon 50v540Uf ZLH, use between 6 and 9 caps.

The esc I’m my experience is too low in amp rating for the motor and voltage, too keep the esc from burning up keep the prop small and measure temps on each run before going up in size on the props.

My advice would be to run a minimum of 200amp esc, the SF200 8s is a good esc or for more money the MGM25035-3 lite is a great esc.

50k is serious rpm for a mono, your setup will pull 43k rpm loaded, i rum 50k rpm is straight line SAW boats.

Good luck


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Thanks for the afvise! I Will definately consider buying one of those two if this build ends up all wrong. I just cant get my head around people running High KV TP motors if this is a drive train limitation :)

Those ecs’s you mention does carry a heftig Price tag, do they support forward and reverse operation ? I really enjoy the flexibility of beeing able to reverse if/when needed.

I have bought 50V caps to replace on the Dynamite if they end up looking toasty.

Thanks for beeing critical in a contructive way.

🙏🏼 Happy boating

[StevenBryant]

Thanks for the afvise! I Will definately consider buying one of those two if this build ends up all wrong. I just cant get my head around people running High KV TP motors if this is a drive train limitation :)

Those ecs’s you mention does carry a heftig Price tag, do they support forward and reverse operation ? I really enjoy the flexibility of beeing able to reverse if/when needed.

I have bought 50V caps to replace on the Dynamite if they end up looking toasty.

Thanks for beeing critical in a contructive way.

[emoji1374] Happy boating

I run Teflon on 1/4 inch flexi upto 50k rpm without issues, just make sure you use a light oil and not grease on the flexi. The drive train will not be a problem if you set it up properly.

The esc are not cheap, but remember you are pushing you power system to the limit and you need quality not cheap Chinese esc.

My SAW boats are running schulze and MGM speedos because they are reliable and can handle the power


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