?!?DC Pumps?!?

[kstone2274]

My question about the L1 iswill it run media reactor and chiller with sufficient head pressure at about a 3' span. About 300 gallons total volume

 

[gcarroll]

No but there are plenty of deaths from 120 V, about 2-3 per year according to NIOSH.

Does that number report how many deaths were related with the use saltwater aquarium?

 

[evmibo]

Efficiency to me = power consumption vs flow rate. think this is the overall discussion that 80w means very little if the flow does not compare to 120w draw of a mag 12 as example under load .... So a standard 1" 5ft length return . Mag 12 draw 120w at 800 gph and 80w dc draw 80w at 500 gph.

Or on the life reef as example , Jeff from live reef will tell you himself the skimmer needs head pressure to perform at its best ,meaning head pressure is more important than flow rates. Think the conclusive test is a flow meter and a p3 ... To measure draw vs flow = efficiancy. In a practical application.

Okay, I understand what you're saying about efficiency, but your example is a bit misleading, no? The dc9000 pump that is drawing 80w will be more like something around 1200gph.

Depends on your definition of efficient. If they are lying about their energy (a measurement a few hobbyists have the ability to verify), why would you think they are truthful about flow (a measurement that a handful if any hobbyists have the tools to verify).

p3's are easy to come by, but I don't know what I'd need exactly to test flow.

No electrician, but I think the controller adds that extra 10w?

 

[ksed]

Your power supply is where you loose your efficiency. Stepping down in voltage at your power supply.

Okay, I understand what you're saying about efficiency, but your example is a bit misleading, no? The dc9000 pump that is drawing 80w will be more like something around 1200gph.



p3's are easy to come by, but I don't know what I'd need exactly to test flow.

No electrician, but I think the controller adds that extra 10w?

 

[TaylorPilot]

Testing the Red Dragon 80w is not really helping the DC's case. The Red Dragon 3 pumps have more closely related with an AC pump than they are with DC pumps.

How so, I haven't looked into them. Are they standard 3 phase motors using a VFD?

 

[ksed]

I believe Greg was trying to say that they operate at line voltage. My assumption is that they are using a VFD

How so, I haven't looked into them. Are they standard 3 phase motors using a VFD?

 

[TaylorPilot]

Yea, I have never really understood the point of dropping the voltage on the pumps. I would think it just adds complexity, heat, and power loss. Maybe for the safety factor, but I always use a GFCI, and the line voltage coming into the controller is still 120 volt, so not really an issue to me.

 

[ksed]

Yes I agree, but with 24V pumps in the water it make it safer if the pump is submersed and the epoxy has a hairline crack .

Yea, I have never really understood the point of dropping the voltage on the pumps. I would think it just adds complexity, heat, and power loss. Maybe for the safety factor, but I always use a GFCI, and the line voltage coming into the controller is still 120 volt, so not really an issue to me.