Originally Posted by David M
The 7.0 is the most powerful 12 VDC pump I could find. It's also much larger than your typical wash down pumps....perhaps three times the size and weight. You will need place to put the beast.
Powerful-yes. But at a price
. The Par-max 7gpm draws 28 amps.
So consider this scenario: you've been anchored out for a 3-day weekend without charging
and your batteries are getting near 50% of charge. You think, no problem, I'm going to motor
for a few hours this morning while waiting for the wind to come up. So you crank up the diesel
, and your Balmar
kicks into high gear
. You love that Balmar
, even though you know that within a few minutes it's going to heat up and will only be putting out 45 amps. Now you go forward, and kick your Maxwell
. It draws 50 amps, and doesn't seem as perky this morning. No problem, you think, I'll wash down the chain while it comes up. Now you've got 50 amps going into the windlass
and 28 amps going into the pump, and the house bank is about as unhappy with you as is your alternator
As soon as you get underway, you notice a rubbery smell coming up the companionway
. You make a mental note to check the engine
once your boat is back in its slip, and when you finally do so you notice a whole bunch of black dust covering the engine
compartment. "No problem," you think, "I'll zip over to CF and start a thread called 'Whats up with black dust?"
I appreciate the fact that the washdown system on David M's research
vessel kicks butt, but I'm going to maintain that the electrical
systems on most recreational sailboats are not up to the demands of a 7 gpm pump on a long electrical
run being used at the same time as an electric
It's a solvable problem for certain, but you'll need to do some significant beefing up of the electrical system
to get it right. What you don't want to do is have the washdown pump draw amperage away from the windlass, because if you do that the motor brushes
will be toast within a short time.
Not really a problem with my bucket, however.