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Search took 0.00 seconds. Search: Posts Made By: Seafarer7
Forum: Electrical: Batteries, Generators & Solar 06-05-2020, 13:19
Replies: 86
Views: 27,352
Posted By Seafarer7
Re: Permanent Magnet Generator on Propshaft

Like your boat, mine was designed somewhat as a motorsailer/powersailer, and manufacturer OKs leaving the prop to freewheel while sailing. I get about 200 to 300 rpm going 4 to 5 kts - I used this...
Forum: Electrical: Batteries, Generators & Solar 06-05-2020, 13:04
Replies: 86
Views: 27,352
Posted By Seafarer7
Re: Permanent Magnet Generator on Propshaft

There are two voltages to monitor: (1) the output voltage from the shaft generator (0v to 72v during normal operations, tied to the input side to the MPPT controller), and (2) the output voltage from...
Forum: Electrical: Batteries, Generators & Solar 06-05-2020, 05:26
Replies: 86
Views: 27,352
Posted By Seafarer7
Re: Permanent Magnet Generator on Propshaft

With twin engines, I would only engage both shaft generators when sailing extended periods. If motoring is anticipated, I may leave one belt on, motor with one engine and lock the other shaft in...
Forum: Electrical: Batteries, Generators & Solar 06-05-2020, 05:13
Replies: 86
Views: 27,352
Posted By Seafarer7
Permanent Magnet Generator on Propshaft

I would never do that. Scary to think of what could happen there. The prop shaft turns so much faster when motoring, I would guess a few thousand rpm, versus just the few hundreds when free...
Forum: Electrical: Batteries, Generators & Solar 06-05-2020, 05:06
Replies: 86
Views: 27,352
Posted By Seafarer7
Re: Permanent Magnet Generator on Propshaft

Good question: so far I haven’t had that problem. On my last ocean crossing, energy was well balanced between consumption and generation (solar plus pair of shaft generators). Since then I increased...
Forum: Electrical: Batteries, Generators & Solar 03-05-2020, 01:19
Replies: 86
Views: 27,352
Posted By Seafarer7
Re: Permanent Magnet Generator on Propshaft

https://www.cruisersforum.com/forums/showthread.php?p=3032997
Forum: Electrical: Batteries, Generators & Solar 03-05-2020, 01:09
Replies: 86
Views: 27,352
Posted By Seafarer7
Re: Permanent Magnet Generator on Propshaft

I have two: they are both PMDC generators, not PMA, one each on each engine, coupled to a Morningstar MPPT charge controller. Both work great - I posted some actual performance figures earlier
Showing results 1 to 7 of 7

 
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