Hi,
I have 900 Watts (Nominal) of solar panels as a canopy on my 25 foot boat. Those drive dual 55 pound thrust trolling motors.
I get about 40 - 45 amps max out of those units at about 12.5 volts under load, so I can run (as long as the sun is shining) with about 500 Watts, or a little less than 1 hp.
The panels go through a charge controller into a bank of flooded lead acid batteries, so it's never really running "purely" off the panels, but I have done some limited experiments wiring the panels directly to the motors.
They do run directly from the panels, starting to turn around 1.6 volts at 2 amps ( 3 watts) and scooting along nicely about 2.8 mph in full sun on panels only.
But the instant you get in the shadow of a tree, or a cloud passes over head, or heaven forbid, you go under a bridge, the motors stop dead.
If you don't mind dragging out a poll or paddle when that happens "direct solar drive" will work, but having batteries in the chain will smooth out the wrinkles for you.
Thanks,
Ken Cooke
Kentucky River, USA
Sent: Thursday, February 16, 2017 4:32 PM
Subject: [Electric Boats] sun power
I'm curious, those of the group with solar panels how much of the time to you find yourselves running purely off the panels without tapping into your battery bank?
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Posted by: "Ken Cooke" <ken.cooke@canewoods.com>
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