amp to wattage conversion

[Kookynewky]

I came across the .pdf for the Solana and found that the stock return pump is rated for 396GPH at .4 amps. According to my calculations (amps x volts = watts) I get 48w at 120v. I then look at the actual pump and it is a Jebao 1500. I find specs for this pump running at the same 396GPH it says 25w with no mention of amps.

I have also seen things like this on Marine Depot for the Maxi Jet 1800. On the website they have the pump rated at 474GPH, .84amps, and only 38w. I tried Marineland's website and they do not post that info on the spec sheet. It looks to me that the MJ1800 should either be .84amps at 100.8w or .32amps at 38w not both.

Can someone help me understand? Am I using the wrong formula?

 

[rwb500]

that is strange. you are using the correct formula. the only reason i can think of is maybe the amps rating is a peak load that only happens when the pump is turned on and/or off, while the wattage listed is the energy consumed during regular continuous operation. inductive loads (like electrical motors, at least AC motors, not sure about DC) behave strangely, especally when started and stopped. i know that when they stop their magnetic field collapses and sends a high current down the power line.

 

[Kookynewky]

I am trying to upgrade the Solana pump to something more efficient without downgrading flow but having conflicting specs like this is proving to be a pain.