Originally Posted by Pelagic
I am trying to make my Northern Lights
Gen (10kw) non critical by switching to a DC water
maker and LED’s, so that if the gen is down, I only loose the air cons which is no big deal.
Fuss I am interested in your shaft generator as Stargazer is fitted with one but the previous owner said they could never get enough RPM from free-wheeling under sail to justify keeping it connected.
I have thought of switching to a low RPM Permanent Magnet Alternator, but focused on the Solar first which is a passive solution
How do you do your prop shaft generator?
Sorry for the late reply.
I would keep the existing watermaker
and run it off the inverter
There can be alot of reasons why propshaft alternators don't work, boat too small (needs 45+ feet), wrong ratio, wrong alternator, small prop, wrong gearbox
The propshaft alternator install looks good and very promising, the ratio looks around 6:1 is that right?
Do you have a 3 bladed fixed prop?
Is your cutlass bearing in good condition?
Does the gearbox
accept a side load and is it hydraulic so that the prop always spins or does it stop spinning when put into astern.?
Advantages of an alternator over a pmm is that you can switch it off, easily regulate it and that it makes amps while motoring as well over the full rev range, effectively acting as an extra alternator.
Disadvantage is that it takes amps to run (about 2 for this one I think as it looks small)
At what alternator revs does this alternator start producing amps? it needs to be around 1000. Also what are the specs... amps at 24v?
At what speed do you stop sailing and start motoring?
Can you "normally" do 5.5kts+ ?