Monday, February 27, 2017

Re: [Electric Boats] Solar Boat issue

 

Do you have a schematic on how you are drawing power off your batteries (Which posts) and the specifications of the % measurement displayed by your charge controller?
 
My guess is that the percentage measure is based on voltage alone, not some true measurement of amp hour discharge capacity.
 
Sometimes I've found that my system voltages will drop to 12.5 to 12.2 volts while underway with motors running full speed, then when I stop for a few minutes the voltages will stabilize back to 12.8 or even run back up to 13+ if the solar panels are still connected.  Your Chinese Charge Controller may be only getting it's reading off the same battery  your power posts are drawing from. 
 
Imagine having 8 barrels full of water, each connected so they rise and fall together through a 1" hose.
You discharge from one barrel with a four inch hose, so the water level in first barrel you are drawing from goes down to 65% while the other barrels are still full.  They will equalize eventually
 
I would pay more attention to system voltage as measured on the negative post of battery 1 and the positive post of battery 8.
 
Thanks,
 
Ken Cooke
Kentucky River
 
Sent: Monday, February 27, 2017 1:36 PM
Subject: RE: [Electric Boats] Solar Boat issue
 
 

 

I have a a solar boat with 6 (130 watt) panels, 80 amp Chinese controller, 8 (98 amp hour) batteries(parallel) and 2 (45 lb) trolling motors. At full throttle one motor draws around 35 amps. After an hour at full throttle the controller shows the batteries at only 65%. Any thoughts?

Tony
Sent from my iPad

Is it possible your controller thinks you only have 98 Amp-Hours total capacity?  (8 batteries in parallel is not a very common configuration so setting up the controller incorrectly is more likely).  35 amps being drawn for an hour would leave 65% remaining if total capacity was only around 100 Amp-Hours.  Can you tell the controller you recharged the batteries (without actually doing so) and see how much energy is really remaining?

Pat

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Posted by: "Ken Cooke" <ken.cooke@canewoods.com>
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