Electric power on restricted Lakes

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Long Island Mac
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Joined: Fri Aug 31, 2018 9:22 am

Electric power on restricted Lakes

#1 Post by Long Island Mac » Sat Sep 01, 2018 9:04 am

Have 20' Bently, 2hp 48v Kota.
Lake only allows el/sail or boats to paddle. Nice, quiet and peaceful. At 1/2 power, all great. When put to full power, it stops. Few minutes later, starts and runs good. Must be some relay or ?? that resets. Any ideas?. Looks as tho most here are gas powered, but I did go over the many posts. I belong to a motor home forum that is very informative, Thought I'd try this forum. Thanks in advance of any replys.

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Henpecked
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Location: Ellis County, TX

Re: Electric power on restricted Lakes

#2 Post by Henpecked » Sat Sep 01, 2018 9:53 am

It sounds like a battery issue. The voltage dips on a heavily loaded battery. Where as lighter load doesn't cause as big a dip in voltage and will put out more energy at a slower discharge rate. If your battery is weak, it may be dipping below low voltage shutdown. Test your batteries if possible.

I don't know much about electric boat motors, but I'm sure there is low voltage setting to shut off the motor to protect from over discharging your batteries. That's the low voltage shutdown I was referring to. I work on battery powered industrial electronics for a living.

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Henpecked
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Location: Ellis County, TX

Re: Electric power on restricted Lakes

#3 Post by Henpecked » Sat Sep 01, 2018 1:54 pm

For your average 48V VRLA battery string, low voltage shut down should be around 40VDC. I don’t know with li-ion batteries. A 12V battery shouldn’t be discharged below about 10VDC. It depends on the rate of discharge and the shutoff is designed into the circuit.

Long Island Mac
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Re: Electric power on restricted Lakes

#4 Post by Long Island Mac » Wed Sep 05, 2018 9:08 am

Thanks for the replys. Batteries less than 18 months, and problem before replacing them. Waiting for motor mfg to reply. Thanks again for replys. :)

willy13
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Joined: Sat Dec 22, 2012 8:23 am
Location: Canandaigua Lake in NY

Re: Electric power on restricted Lakes

#5 Post by willy13 » Thu Sep 06, 2018 12:45 pm

Can you ever get it to run at full power for any length of time?

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Henpecked
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Re: Electric power on restricted Lakes

#6 Post by Henpecked » Thu Sep 06, 2018 2:10 pm

Are you able to monitor the voltage and current real time? That will tell you if your trouble is supply or demand.

Long Island Mac
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Re: Electric power on restricted Lakes

#7 Post by Long Island Mac » Thu Sep 06, 2018 4:08 pm

Today, ran it at 3\4 power. 5 minutes, shut down. Controller screen went blank. 4\5 minutes all came back on. Might be a relay somewhere???

willy13
Posts: 200
Joined: Sat Dec 22, 2012 8:23 am
Location: Canandaigua Lake in NY

Re: Electric power on restricted Lakes

#8 Post by willy13 » Thu Sep 06, 2018 7:40 pm

My guess is the motor is drawing too much current, could it be over propped?

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