My boat: 1991 21' Walkaround
Background: In replacing a bilge pump, hose and thru hull; I would like to upgrade the current 500 gph Rule pump to a 1100gph unit. Primarily for extra peace of mind/upgraded pumping capacity. This involves an up-sizing of the hose from 3/4" internal diameter to 1" internal diameter and a corresponding up-sizing of the thru hull; which i am replacing the factory (?) nylon thru hull with a stainless version.
Question: Is there any downside to moving to the larger pump/hose diameter/thru hull?
Replacing bilge pump with larger model; any reason not to proceed?
Replacing bilge pump with larger model; any reason not to proceed?
1991 21 Walkaround, 2001 Yamaha 250 OX66
1987 Outrage 18 [project]
1987 Outrage 18 [project]
Re: Replacing bilge pump with larger model; any reason not to proceed?
Battery drain is about it...then again if it takes 5min to pump @500gph and 2min to pump @1100gph, which would use more battery?
I had an 1100 in my Montauk. Personally I think a 500 is good for a small boat or a live well pump. I had a Rule 1100 or so with the built in float sensor. Longevity was only a few years. They might have gotten better over the last 18 years or so.
I had an 1100 in my Montauk. Personally I think a 500 is good for a small boat or a live well pump. I had a Rule 1100 or so with the built in float sensor. Longevity was only a few years. They might have gotten better over the last 18 years or so.
On my 24th Whaler. Currently in the stable: 86 18' Outrage, 81 13' Sport(original owner), 87 11' Sport, 69 Squall(for sale cheap).
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roundle1979
- Posts: 95
- Joined: Thu Jun 13, 2019 11:10 am
Re: Replacing bilge pump with larger model; any reason not to proceed?
My Nantucket 190 came with a Rule 900. Your 500 seems a little small if it's the only pump.
You could consider keeping the 500 (or buying a new 500) and keeping it on the auto switch and then adding a larger second/backup pump and place it on a manual switch.
You could consider keeping the 500 (or buying a new 500) and keeping it on the auto switch and then adding a larger second/backup pump and place it on a manual switch.
2004 Nantucket 190 w/ Mercury Optimax 135
Re: Replacing bilge pump with larger model; any reason not to proceed?
NICK poses the question of a pump’s efficiency in terms of how much water it moves for how much electrical energy it consumes. I don’t believe the manufacturer (RULE) provides any data on that parameter.
Since the design of the pumps seems to remain the same among the several different capacity-rated pumps, I don’t see a basis to infer which model will be more energy efficient. I would assume all the pumps of similar design and varying only in capacity are probably all similarly efficient in their consumption of electrical energy.
Perhaps if there is an electrical current specification given, you could compute the efficiency by calculating the duration of time to move 100-gallons and multiplying by the Amperes consumed.
Generally there is not a large cost burden for electrical energy on a boat as it comes more or less for free from running the engine. Saving electrical load might be more important to consider for a boat left on a mooring and run only by battery stored electrical energy.
Since the design of the pumps seems to remain the same among the several different capacity-rated pumps, I don’t see a basis to infer which model will be more energy efficient. I would assume all the pumps of similar design and varying only in capacity are probably all similarly efficient in their consumption of electrical energy.
Perhaps if there is an electrical current specification given, you could compute the efficiency by calculating the duration of time to move 100-gallons and multiplying by the Amperes consumed.
Generally there is not a large cost burden for electrical energy on a boat as it comes more or less for free from running the engine. Saving electrical load might be more important to consider for a boat left on a mooring and run only by battery stored electrical energy.
Re: Replacing bilge pump with larger model; any reason not to proceed?
Thank you all. I will post my experiences. Installing the 1100 gph model today.
1991 21 Walkaround, 2001 Yamaha 250 OX66
1987 Outrage 18 [project]
1987 Outrage 18 [project]
Re: Replacing bilge pump with larger model; any reason not to proceed?
To follow up on electrical efficiency: if the pump is to run entirely from electrical energy stored in a lead-acid battery, then a lower current draw pump may be preferred on this basis: the ability of a lead-acid battery to deliver stored electrical energy will tend to be greater if the current drawn is smaller.
This will be true only if we can assume all pumps are equal in electrical efficiency. The advantage of lower current drain occurs due to the nature of lead-acid storage batteries, and not from the pump efficiency.
This will be true only if we can assume all pumps are equal in electrical efficiency. The advantage of lower current drain occurs due to the nature of lead-acid storage batteries, and not from the pump efficiency.