Tuesday, December 3, 2024

Re: [electricboats] Complex design issues

Thanks for the response. You noted that I had two strings of four panels, which I do, but they would be pairs in series & parallel with each   :-|____|+........ -|___|+: other 
                                                                                 :-|____|+........ -|___|+:
                                                                                 :-|____|+.........-|___|+:
                                                                                 :-|____|+.........-|___|+:
                                                                                 : ..........batteries....... :
Each panel of 100 watts, configured together, going from 12-18 volts depending on the sun, producing 48 to 72 volts and 22 to 33.3 amps, being controlled by your Victron MPT 150 volt / 35 amp, seems like it would be what I need to charge one four battery bank of batteries that are configured to provide 48 volts to the Electric Yacht 2.0 single or tandem drive motors. Using bank #1 of 185amps THEORETICALLY using 40% of that power (74 amps) would drive my boat @3.5knots for about two hours and almost an hour longer if the 22.22 additional amps are added in each hour(assuming the voltage is @18 volts/panel), then switch over to the fully charged bank#2 with the same treatment for another two to three hours. Again, ALL THEORETICAL. Every few hours, I can run the 48 volt gen.set to fully charge the first bank again. The 10k gen.set can put out 208 amps @ 48 volts which can run the Electric Yacht 2.0 to travel @ 6.1knots through the battery banks or directly. With both gen sets online, the hull speed of 7.1 knots, requiring 330 amps, 48 volts, 15,840 watts is THEORETICALLY do-able. THAT though, is why the boat is a hybrid. I like the quiet of a sailboat in motion that the electric motors provide, however, at the same time the gen sets, at only 60 decibels are not nearly as noisy as a big engine chuggin' along. These are clean and quiet and with two, redundant. 
 I've had the gen sets on another boat that had 4 thru the hull pod motors. It was a 38' boat. that boat had no solar panels but it had 24 batteries in three separate banks. It was a prototype and out of Cambridge, Md., we did a shakedown cruise of about 25 miles @6.3 knots on one battery bank of 8 185 amp/hr. batteries. At 70%, one of the gen sets was supposed to come on, but it didn't. When we got back the bank was down to almost 60%. We started a gen set and in about two hours the bank was fully charged. The generator had used only two liters of fuel! If you extrapolate the distance traveled and the weight of a 38 foot cyprus built wooden boat, that is an efficiency that started me down this path. The same trip with a diesel would have consumed several GALLONS of fuel. Both gen sets are still new....except one of them has two hours on it. This project is the whole enchilada. Wind turbine forward, solar panels on the cabin and cockpit roof. My plan is to do it right but try to get it done before I die....which I'm trying to avoid for a while. I apologize going far afield here but it has become a bit of a passion that I recognize I can't do it all nor know it all. That's why I appreciate the knowledge and input of you guys. Having a Nigel Calder for a neighbor might have helped too!
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