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Note:
1. Please turn down the knob to the end counterclockwise before using, and then turn up slowly.
2. Please pay attention to your safety when the voltage is more than 36V.
3. Several tested power supply can not be connected simultaneously.
4. The current adjustment knob should be regulated slowly.

Package Include:
1 x Adjustable Constant Current Electronic Load
1 x Charger
2 x Crocodile Clip
1 x USB Crocodile Clip
(Other items in the picture are NOT included)

Instructions

• Turn knobs couter clockwise to reset things to 0
• Calculate the max current using I=P/V, I=150/V
• Slowly increase current using the knobs ensuring that you are well under your max current.

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Problem

• something has shorted

Solution

Tested the MOSFET (See reference below) and replaced MOSFET and everything seems to be working now. 

Why did it Break?

Probably because I hadn't reset the knobs controlling the current to zero resistance before connecting to battery.

This unit has a 150W limit! So, if you are using 40V, the max current you should draw would be:

P=IV

I=P/V

I=150/40

I = 3.75A

Pictures

IRFP260

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IRDF264

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Fix

I replaced the broken IRFP260 with a IRFP264. Works but not reported proper results.

Ordered some IRFP260N chips. Will try those.

References