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Subject: TWL: RE: Belt driven A.C. Alternator/hydraulic gensets
From: John Shea (cap'n@XXX.XXX)
Date: Fri Jan 24 2003 - 23:13:42 EST
Greetings all,
Interestingly, my hydraulic system powers both my 15hp Shipwrights bow
thruster and my 10KW Getech generator off the main. The system employs a
variable displacement Oilgear pump, cog belt driven off the crankshaft. The
system uses Nachi control valves. By throwing a switch in the wheelhouse, I
choose to run either the Genny or the thruster. Obviously, the control
valves are required since the GPM and pressure requirements are different.
The valves are mounted on a manifold so I can add another hydraulic
component later, like a winch to kedge myself off a sandbar. (Naw, that
would never happen). Underway, I've loaded the Genny to the max and it has
little effect on engine RPMs. The 24 gallon reservoir gets pretty toasty,
about 125 degrees I think, making the engine room warmer. Though, I would
imagine a genset would throw out similar thermal energy. Even though the
main runs with a dry exhaust, adding to engine room heat, I'm not too
concerned since I use a 460cfm 110v ventilator running off a 1Kw inverter to
pump air up the ventilation shaft.
Once the hydraulic juice warms up a bit, after 3 to 5 minutes, my Hz meter
varies no more than 1-2 Hz. Even steadier with a load. My highest
inductance/surge, I imagine, would be from the 2Hp Baldor motor running the
high pressure pump on my water maker. After the momentary surge, everything
hums along.
Maybe, Eric, your poor system performance was a result of design since other
systems, similar to mine, are used up here in New England by commercial
fishermen. I had a the help of a factory rep to design the system and show
how to install it.
Regards,
Capt. John Shea
M/V DOTSEA
Portsmouth, NH
cap'n@XXX.XXX
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