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#1
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Isolation transformers
Larry wrote:
snip Wouldn't it be cool if someone were to build a diesel genset of the technology of the electronic switching gensets like mine? When the boat is off on its own, the slow-speed, economizing diesel's high voltage, high frequency flywheel coils would power its precise 60 Hz, synthesized switching AC power supply to drive the boat loads, as the diesel lumbers along, not at 1800 or 3600 RPM, but a much slower speed only to provide the electronics the DC to drive its output loads. snip I did something similar in '91; drove a military 2 kVA alternator with an oversized small engine. The alternator's output was full-wave rectified and drove a Sola 2 kVA switching power supply (72 VDC in, 120 VAC 60 Hz out); I also had a 72 volt 200 AH battery reservoir drive the supply when the engine was off. It worked quite well. The engine could essentially run at high idle to charge the batteries for my average load; the duty cycle was about fifty percent. Michael |
#2
posted to rec.boats.electronics
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Isolation transformers
msg wrote in
: I did something similar in '91; drove a military 2 kVA alternator with an oversized small engine. The alternator's output was full-wave rectified and drove a Sola 2 kVA switching power supply (72 VDC in, 120 VAC 60 Hz out); I also had a 72 volt 200 AH battery reservoir drive the supply when the engine was off. It worked quite well. The engine could essentially run at high idle to charge the batteries for my average load; the duty cycle was about fifty percent. Michael This idea would also work very well using the technology of the hybrid cars, self-starting the engine only to recharge the high voltage, low current battery pack much more efficient and certainly lighter than the old lead-acid monsters that have little power storage. The boat would simply have a constant supply of AC power to run everything, with several high voltage charging systems, including the autostarting engine drive. As the wind charger output increased, or the solar array, the engine would run less and less. A computer controlling it all taking the power management load we have now away from the inhabitants. Of course, many would resist who want their boats to be time machines back into the 1800's....(c; If we get rid of the drive engine and go to high voltage traction motors to power the shaft, we'll only need one engine to power both the screw and the rest of the boat. It won't matter where the designers put this engine and the inherent problem of always having to put the engine in the way in the middle of the boat would disappear. A 50hp traction motor is quite small, indeed. I think the boats would have more room without the old inline diesel drives we have now. Just dreaming. Change comes slow. |
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