Re: [electricboats] Controller overheating

Hi Mich,

Your input into the controller is 30 amps. The output to the motor will be higher, but still under the continuous rating of the controller at 450 rmp's. Just an FYI. 

Matt Foley 

Sunlight Conversions

Perpetual Energy, LLC

201-914-0466

sunlightconversions.com

instagram.com/sunlightconversions/

youtube/sunlightconversions

On Monday, January 31, 2022, 12:23:21 PM EST, James Sizemore <james@deny.org> wrote:

Before doing more advanced trouble shooting, I would first check that the lugs on your cables are not getting hot from bad crimps and internal arcing. Also check andvmake sure the nuts are clean and snug.

You would be surprised how much heat a bad connection can generate.

I use a Seek thermal sensor to check for heat distribution, that can save lots of time trouble shooting and are fairly cheap. 

On Jan 31, 2022, at 9:48 AM, Mich Pop <michpop@gmail.com> wrote:

Hi all,

I wonder if you could please come up with some thoughts as to why my controller overheats at relatively low currents.
Once it reaches 90 Celsius it downregulates the current which can be dangerous in some situations.
Latest example: running at 450 rpm = 30 amp for an hour
when the controller downregulated to 200 rpm for 10 minutes before resuming at 450 rpm.
Ideally I would like to be able to run at 200 amps for 90 minutes.

Heat dispersal is optimised in regards to airflow and a fan that starts at 50 Celsius.

The controller is an older model and I'd be happy to get a new one.
I'd like to hear what kind of controller you suggest.

I've got a 4.5 ton 29 Roberts with a 48V 15s 4p 450 Ah 21.6 kWh LiFePo battery. (usable 360 Ah  = 17.3 kWh)

The controller is a Kelly
KAC72601-8080I
1 Minute Current600A
Continuous Curent240A
Voltage24-72V

The motor is a 7.5 KW, 4P, 415V, AHE132M4, 3PH, MEP S2
rewound to 30 VAC, air cooled
The motor doesn't get hotter than 80 Celsius

Here is the average performance I get with a hull that could be cleaner.

Rpm.  Amp.  Knots
350.    20.    1.5
400.    28.    2.0
450.    30.    2.1
500.    50.    2.5
550.    63.    2.7
600.    80.    3.0
650.    93.    3.3
700    113.  3.5
750.   140.   3.7
800    180
900    260

Thank you so much for your thoughts

Cheers
Mich