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GBM GBM is offline
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First recorded activity by BoatBanter: Jul 2006
Posts: 48
Default Alternator size vs Windlass current

I am still trying to decide on a windlass for our boat. Perhaps some the
experienced cruisers can help?

Our alternator output, is nominally 55A, but likely actually quite a bit
less. Max size alternator recommended for Yanmar 2QM15 engine is about 80A)

Some suitable horizontal windlasses for a 32 ft boat draw as much as 90A
(e.g. Quick Eagle 500/700)

If we have the engine running at say 1500rpm while pulling up the anchor, we
may be putting about 35A into the 200AH house bank, if we are lucky. At the
same time, the windlass is drawing up to 90A and other items like the refrig
unit are still drawing current. We could have a shortfall of 60A for 5-10
minutes.

Question: Would I be better to buy a somewhat undersized windlass that might
only draw 35A? (e.g Lofrans Dorado with gypsy on wrong side ) or buy the
larger unit and draw a bigger current?

GBM

(PS: I have 6 Ga wiring already installed, but will change if need be)


 
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