Interesting.999zip999 wrote:How about a panko Fisher 3-phase dishwasher motor. At the junk yard or scrapper.
DrkAngel wrote:"Amps" supplies torque for pushing over large props.
Volts = speed
Amps = torque
Yes, that seems correct as I understand it.
Factors to consider:
Desired propeller rpm range?
500 - 1000 RPM
Direct power, no controller, on solar is slightly more efficient.
So we should wire them all in parallel and simply have an on-off switch?
Motors are most efficient near 70-80% of no load speed.
And to control the motor from batteries?
250 watt input from panels ≥ 225w (output) motor
400 watt input from batteries ≥ 375w (output) motor
Using voltage to emulate gearing, 750-1000w (output) motor might be desirable?
But I over volt 450w motor for 675w output.
Okay, so what are you suggesting here in my case?
Controllers, typically, have a low voltage limit and high voltage limit.
Okay, so what does that mean in our application?
Unfortunately, I am more familiar with brush motors, so some other expert might have a good suggestion on motor-controller.
Volt Amp Watt meter
Also see -eBike Toolbox Bargains
Not clear where the 36 volt battery comes in.DrkAngel wrote:30V LVC (Low Voltage Cutoff) disconnects power if battery, or power source drops below 30V, which is a standard safety for 36V Lithium battery.
With 48V solar panels, 30V will allow throttling maximal draw from panels, reduced voltage offset by substantial amps. Drawing down panel voltage increases panel output somewhat. Larger than needed wire gauge helps too.
Just keep voltage-throttle position above 30V to prevent power interrupt!
Brush motors have greater options and availability ... but with somewhat reduced efficiency.
Rated as 3.6V or 3.7V = average discharge voltage over full discharge cycle.BlueBell wrote:By cell rating do you mean the "C" value?
24 18650 cells = 2-2.5lbs.BlueBell wrote:Any idea what this battery is going to weigh?
1. Charge w/AC before race day. Quality Lithium does not bleed energy.BlueBell wrote:2 -2.5 pounds, nice!!
Helps make up for the 17 pound motor!
What can we use to charge the battery from the four panels?
On race day, we're not allowed any shore charging ( from 120v A/C ),
only what the panels will give us.
It ( along with the panels ) can be removed for the 25 minute, battery only heat.