Just get one of these -
Excellent bit of kit. Fully programmable. Uses Modbus RTU so easy to use.
Stacks of features, you wont need anything else really.
They also have a higher power version available for about 35 dollars.
Mine was about 23 dollars IIRK.
https://item.taobao.com/item.htm?spm=a312a.7700824.w4004-1173757744.11.21c386dcaHJ2Lb&id=550339476787(right click and translate in Chrome)
It offers loads more features than listed.
I have enclosed a few bits of info.
I can give you a link to a page to buy one (the link supplied is the manufacturer) - you can try him but may have to go to a supplier.
I have translated the modbus info already (they dont supply it in English as their market is for the internal Chinese mainland for load testing and burn in.
The newer '300W' (tongue in cheek but - it can handle it for short times - well mine can handle 150 for short periods - no worries)
is also listed on their site. This has only just come out. I will be ordering one soon. Mine is the 150W 60v 10A unit.
Main site is -
https://shop103127720.world.taobao.com/?spm=a312a.7728556.2015080705.3.3463f1b30tPIItBeauty of it is, just hook it up to an arduino or whatever, a small display and a keypad and you have full programmability.
Yay !!
(had to zip the product overview file as it was over the 1 meg limit) -
CC CV C Resistance check it out. Not worth buggering about with other really. I was going to build or mod something and went for this. It does what it says on the tin - VERY well made as well - real quality even if they may be a tad optimistic on the total power (for any length of time)
If you need any more info on the Modbus stuff let me know.
Enjoy...
edit - the modbus info shown are from the parameter files loaded into 'Modbus Poll' (commercial modbus testing) - but you dont need that at all - just hook it to an Arduino
.
All the data is in Chinese only, but I have translated all that matters.
Joe.
If you need 'more power Egor' then PM me .......................