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The new 40 amp PWM arrived today and I've just tested it and then fitted it to the outboard. I'm relieved to say that it's working perfectly now. When the pot is turned up the motor starts turning very slowly, and without any audible frequency buzzing. As per the helpful suggestions on this...

It's bad for self-confidence though. :oops: This time I've ordered the flying lead version.....

So do I ! :rolleyes: I've just tried the light bulb test, with a 12v 5w car sidelight bulb, and no joy, it didn't light at all. (Though the board's led light does come on when the rotary switch on the pot closes)..... Confession time - I did desolder the pot to put it on a flying lead, as...

Yes, the water did make quite a sloshing sound, the neighbors probably thought we'd put in a Jacuzzi.... :) I ran the input leads from the battery direct to the PWM input, then it's output to the original fwd/rev changeover switch. Yes, the blue is the now defunct slow speed winding. The...

The duration test was a great success, my 36v 10ah lithium ion bike battery packs do have a built-in LVC. The power cut off automatically after 3 hours and ten minutes of low speed ( 10 amp 12v ) running. The wattmeter showed 8.8 a/hr consumed, and the final voltage under load was 31.95v. the...

Thanks, it's good to get all the pros and cons of each solution. I've had the T24 in the test tank for just over two hours now, running at speed one, which uses around 10 amps at 12 volts. This shows up on the source wattmeter as 2.76 amps at the bike battery's 36 volts. It's the speed I use...

Prompt and very useful feedback again, IR772 & d8veh, thanks. I'll time the discharge test and watch it like a hawk when it gets down near 28v if it hasn't already shut off. On the Lipo front, each time I think I've nearly got it cracked, I then find out I'm outdated again... :rolleyes: I...

Ok, thanks IR772 and d8veh, I'll run another test with the outboard in the tank. This time I'll run it until it either cuts out automatically (hopefully :rolleyes:), or until the pack voltage drops to minimum safe level, by keeping a carefull eye on the wattmeter, as you say d8veh. What would...

I've just had a worrying thought that may render my project useless. Here I've been, confidently citing my ready-made lithium iron battery pack's BMS as automatically monitoring the discharge, but I may be quite wrong. :oops: Was I right in assuming that the battery pack itself has got a low...

Yes, I guess my cheapo Watersnake t24 does have a resistor for the low speed one setting, probably mounted at the bottom of the leg in the motor housing, as Geebee suggested. I'm still mulling over all the possibilities now, and I like to keep my kit as versatile as possible. My new "bike...

Thanks Geebee, that sounds logical.

Thanks IR772.

Thanks for the constructive post d8veh, I understand most of what you've said, and certainly do want maximum efficiency with no wasted stored battery power. IR722 had suggested a PWM controller too, and I did get one of those to experiment with too...

The parts have now arrived, and I've tested the setup. I apologise for waffling on about batteries for canoes, not very electric bike oriented, but it may be interesting for anyone like me who's into lightweight electric waterborne propulsion, as well as bikes. :rolleyes: So, the object of the...

Agreed, it's sad that the basics of power generation inefficiencies and power consumption are alien to most people today, despite an alleged superior standard education. Maybe their attention and interest is more widely dissipated over today's high tech gadgetry for them to really understand...

Focusing on the front or back powered wheel question, I prefer front wheel hub motors myself. I've tried several front and rear, but I go with the comments on here about better weight distribution. I'm glad I don't have to decide on having a single bike, the compromises would make it a...

Thanks IR, I'll wait for the toys to arrive, then give feedback on here and send technical advise to Cunard. :rolleyes:

I just thought of googling this, and there's some very interesting hits for pwm's with trolling motors: https://www.glen-l.com/phpBB2/viewtopic.php?t=7680 It looks as though the PWM is more efficient anyway....

I've found a 60 amp PWM on ebay, at £20.59, (from Jersey, UK) http://www.ebay.co.uk/itm/60A-DC-Brushed-Motor-Speed-Control-PWM-HHO-RC-Controller-12V-24V-48V-3000W-TE573-/331951750406?hash=item4d49ddbd06:g:tSsAAOSwV0RXwIZ7 It would need mounting in a container though, unlike the self-contained...

I can't resist it any more, you've convinced me I need to try it... :rolleyes: I'll test it as an alternative to the Buck, amps drawn etc.. I'll still feel safer with a physical stop on the controlling pot though (family might be using it) , I don't want to burn out my outboard, it cost...