mag drive 9.5
- Thread starter mitch303
- Start date
I didn't say otherwise. My point was head is head. A valve adds head the same as pluming does. People seem to think adding a valve partially closed is a terrible thing, but routinely use pluming that is 1/2 the size it should be and think nothing of it.
That is not at all surprising. The 9.5 is a pretty strong pump and HOB overflow typically cant actually flow what their rating indicates. I would go with a Mag5. Mag7s are really loud for some reason. If you are unsure, you can get the Mag5 and also a Mag7 impeller. They are the same pump. Swap in the impeller and you have a Mag7.
HOB overflows can be tricky. A non siphon overflow has a max GPH. You can run as little as you want and as high as the overflow can handle.
Siphon overflows have a max and a minimum flow. As you can see, max is often far less than the advertised rating. The minimum is not stated. There has to be enough to keep bubbles pushed through the U Tube so that they dont accumulate. Its not that much. Typically 200 GPH or so. I think the Mag5 will be fine. Plumb it with a minimum of 3/4" tubing. 1" will get you a bit more flow.
Siphon overflows have a max and a minimum flow. As you can see, max is often far less than the advertised rating. The minimum is not stated. There has to be enough to keep bubbles pushed through the U Tube so that they dont accumulate. Its not that much. Typically 200 GPH or so. I think the Mag5 will be fine. Plumb it with a minimum of 3/4" tubing. 1" will get you a bit more flow.
Kerreefer
In Memoriam
hrmmm
a: check out what flow you get by using the calc. on the site here with that 9.5. Mag drives loose lots and lots of flow on head. a simple 90 degree elbow drops it quite a bit. honestly if you have the bucks, keep the 9.5 for later use or a back-up and get a 5... 7's are really loud idk why, but 4 of mine are all the same... LOUD. the 12 i have is not even as loud.
b: a magnetically driven motor has the same wattage/amperage draw regardless of load. i tested it out cause i was curious, but it makes sense. you are creating a magnetic field. load is shed from torque slipage between this field.
C: i run a mag7 on my 180. i spot feed 1-2 times a day. i run dual skimmers. both octos. i have no issues with parameters. in fact the only thing i check anymore is calc. It gets below 400 and i do a 30 gallon wc, which is about every 1.5 months using Aqua Vitro Salinity.
a: check out what flow you get by using the calc. on the site here with that 9.5. Mag drives loose lots and lots of flow on head. a simple 90 degree elbow drops it quite a bit. honestly if you have the bucks, keep the 9.5 for later use or a back-up and get a 5... 7's are really loud idk why, but 4 of mine are all the same... LOUD. the 12 i have is not even as loud.
b: a magnetically driven motor has the same wattage/amperage draw regardless of load. i tested it out cause i was curious, but it makes sense. you are creating a magnetic field. load is shed from torque slipage between this field.
C: i run a mag7 on my 180. i spot feed 1-2 times a day. i run dual skimmers. both octos. i have no issues with parameters. in fact the only thing i check anymore is calc. It gets below 400 and i do a 30 gallon wc, which is about every 1.5 months using Aqua Vitro Salinity.
psykobowler
New member
I used a mag 9.5 on a 34 gallon display with a 15 gallon sump but I had a manifold on the return that pumps water into 2 nextreef reactors (carbon & gfo) and a chiller. It is a very strong pump but once you add more equipment, you will appreciate the power.
I have since used the pump on my 90 gallon frag tank that supplies my return, refugium, 2 reactors and a chiller. It is an awesome pump.
I have since used the pump on my 90 gallon frag tank that supplies my return, refugium, 2 reactors and a chiller. It is an awesome pump.
Not trying to beat a dead horse, but here are some pictures that show magnetic drive pumps power consumption changes with flow rate.
I did a Sedra 12000, and a Mak 4 Sedra is like the mag drive, in that it is a submersible pump, Mak 4, is a magnetic drive external pump.
First Picture Mak 4, with the valve closed most of the way (old ball valve could not close it all the way.
73 watts
Valve wide open 95 watts.
Sedra pump
Valve closed completely
only 46 watts.
valve open completely, but still pushing about 4 feet of head through 1 inch pipe.
83 watts, almost double the wattage.
Kim
I did a Sedra 12000, and a Mak 4 Sedra is like the mag drive, in that it is a submersible pump, Mak 4, is a magnetic drive external pump.
First Picture Mak 4, with the valve closed most of the way (old ball valve could not close it all the way.
73 watts
Valve wide open 95 watts.
Sedra pump
Valve closed completely
only 46 watts.
valve open completely, but still pushing about 4 feet of head through 1 inch pipe.
83 watts, almost double the wattage.
Kim
I've done similar tests on a Mak4, Eheim 1260, Mag9, Velocity T4, and a couple others. Every one of them had reduced power use with reduced flow due to added head. Mind you, its not linear. You dont cut the flow 50% and get a 50% reduction in power use. Its still more efficient to use the proper size pump.
I just had to post that to counter a much older post where somebody said it did not matter what flow you had with a mag drive pump, the power consumption never changes...
This is why when meshmoding pumps people worry so much about putting to much mesh on the pump and causing the pump to overheat.
I could not agree with you more Scott, as long as you are using similarly efficiency pumps getting the correct size will use the least amount of power... But many times going to a more efficiant pump will be better even if it is bigger. Mag drive pumps are not very efficient in any size.
This is why when meshmoding pumps people worry so much about putting to much mesh on the pump and causing the pump to overheat.
I could not agree with you more Scott, as long as you are using similarly efficiency pumps getting the correct size will use the least amount of power... But many times going to a more efficiant pump will be better even if it is bigger. Mag drive pumps are not very efficient in any size.
