Super User Further North Posted June 20, 2018 Super User Posted June 20, 2018 2 hours ago, J Francho said: I totally get what you're saying, and it's arguing semantics. Or in my case, doing a poor job of communicating. ? 1 Quote
Super User J Francho Posted June 20, 2018 Super User Posted June 20, 2018 Growing up on the water, I've seen a few boat fires. Never from an onboard charger. Usually some idiot forgets to turn on the blower to air out the fumes in the I/O engine bay. Keep in mind, charger like the Shumachers are not waterproof. On board chargers are. 1 Quote
Super User Further North Posted June 20, 2018 Super User Posted June 20, 2018 21 minutes ago, J Francho said: Growing up on the water, I've seen a few boat fires. Never from an onboard charger. Usually some idiot forgets to turn on the blower to air out the fumes in the I/O engine bay. Keep in mind, charger like the Shumachers are not waterproof. On board chargers are. Same here...there was a well meaning gentleman on another forum...probably well into his 70s at the time who made the same claim about on-board chargers. When pressed, he'd known one person, a couple decades plus back, who had a fire in their boat while it was stored over the winter who thought the charger was the source...and denied that it could have been mice gnawing on something. Everything else was hearsay - friend of cousin's uncle's best pal named Bob kind of stuff, or he'd read it, "...on a forum somewhere..." ...so what it boiled down to was one data point in 50 years of boating. and that was probably 5, 6 years ago. To me it's a lot like the folks who claim composite trolling motor shafts break...but they've never seen it happen... Quote
Super User J Francho Posted June 20, 2018 Super User Posted June 20, 2018 5 minutes ago, Further North said: To me it's a lot like the folks who claim composite trolling motor shafts break...but they've never seen it happen... Metal ones definitely bend, lol. 1 Quote
Super User Further North Posted June 20, 2018 Super User Posted June 20, 2018 3 minutes ago, J Francho said: Metal ones definitely bend, lol. ...I wasn't gonna go there... ? Quote
Super User Tennessee Boy Posted June 20, 2018 Super User Posted June 20, 2018 20 minutes ago, Further North said: To me it's a lot like the folks who claim composite trolling motor shafts break...but they've never seen it happen... I worry a lot about breaking the composite shaft on my trolling motor. That's why I put a $1K 360 imaging transducer out in front of it to cushion the blow on anything I hit. ? 1 2 Quote
Super User Further North Posted June 20, 2018 Super User Posted June 20, 2018 3 minutes ago, Tennessee Boy said: I worry a lot about breaking the composite shaft on my trolling motor. That's why I put a $1K 360 imaging transducer out in front of it to cushion the blow on anything I hit. ? You're killin' me...?? ...I put my $1,200 360° on the transom to protect my MEGA transducer... ? 1 Quote
Super User WRB Posted June 20, 2018 Super User Posted June 20, 2018 Electric only lake and the TM is your only power source, then 36V with 3 group 31 batteries makes some sense. You will need a stern rudder if the TM is bow mounted. The battery weight 65-70 lbs each = 195-210 lbs, not a problem without the outboard engine and gasoline weight. 12V battery wired in series to increase voltage is still a individual 12V battery. 12V battery wired paralell to additional 12V batteries are a group increasing amp hour output by the number of batteries in paralell. It comes down to power need vs amp hour need, more power increases thrust force available to go faster. More amp hour storage increase run time. NOCO is a compact size water proof onboard charger verses Power Pro being larger size, more expensive and repairable with meters to indicate battery charge levels. Choices! Tom 1 Quote
fissure_man Posted June 20, 2018 Posted June 20, 2018 38 minutes ago, WRB said: 12V battery wired in series to increase voltage is still a individual 12V battery. 12V battery wired paralell to additional 12V batteries are a group increasing amp hour output by the number of batteries in paralell. It comes down to power need vs amp hour need, more power increases thrust force available to go faster. More amp hour storage increase run time. Comparing 36V (3x12V series) versus 12V (3x12V parallel) with greater amp-hours isn’t a trade-off between power/thrust and run-time. There’s no performance or battery-efficiency benefit of running the 12V system. The 36V gives you higher max thrust when you want it, and it also gives you a longer battery life when comparing equivalent trolling speeds. All else equal, more amp-hours would mean more run-time, but can't forget that the 12V system draws 3X as many amps as 36V for the same power output (not to mention differences in efficiency). 1 Quote
Super User WRB Posted June 21, 2018 Super User Posted June 21, 2018 12V TM can't achieve the same power output as a 36V. When fishing most TM's are used at less then 1/3rd the potential power thrust, Max power thrust is used to move the boat faster. A 12V, 3 battery system has enough amp hours to run for 2 days fishing with limited 50 lb power thrust. A 36V system could also run 2 days at low power output with the added advantage of short excursions high power thrust 105 lbs. A 24V system with 4 batteries, 2 pairs in series, would run 2 days or more with up to 80 lbs power thrust. I run a 24V, 2 gr 31 batteries and often fish 2 days without recharging because I rarely use more then 1/3rd 80 lbs thrust, because I use my OB to move the boat. All electric creates a different set of circumstances. Tom Quote
(='_'=) Posted June 24, 2018 Posted June 24, 2018 On 6/20/2018 at 6:18 AM, J Francho said: This is science folks. 1 Quote
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