will this work on a 12 volt ,5 hp motor ?

A simple way to have an idea is this: An Hp is approximately 745.7 W Therefore 5 HP would be (5 * 745.7) = 3728.5 W This value is below the PWM capacity so it would seem that there would be no problems However, if you talk about equipment at 12 volts, the consumption of amps would be remarkably high. We are talking about 3,728.5 / 12 = 310.10 Amps (These calculations are value of illustration). Then this value is well above the capacity of the device (Whose maximum peak is 100 Apms and a nominal of 60 Apms according to the seller's data), so if you want to use it, you will not be able to power your engine to its full capacity.

Do you know of a speed contoller like this for a 48v 400amp dc brush motor?

I used to work in heavy industrial manufacturing...you are looking for an S.C.R. variable power supply...a fixed DC voltage input with a variable DC voltage output @whatever current the input can provide (48 VDC @500 amps would give you 0 to 52 VDC output @450 amps)...you are not going to find something like that dirt cheap, and they are not very compact...usually 20-24 inches square and 12-14 inches tall...and they run HOT...install a fan!

Manufacturer	Walfront
Part Number	Walfront-052601
Item Weight	1.1 pounds
Product Dimensions	15 x 7.2 x 2.3 inches
Item model number	0
Is Discontinued By Manufacturer	No
Material	Metal plastic
Shape	Rectangle
Installation Method	Screw-In
Usage	DC Brush Motor controller
Batteries Included?	No
Batteries Required?	No

10-50V 100A 3000W DC Motor Engine Speed Controller PWM Control Industrial Motor Speed Regulator for DC Brush Motor for car cooling fan motor

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