This message it serves two purposes.
First, this is to shake your inner world speaking of pricing of electronics in China.
Second, this is to increase your awareness about the fact that design and manufacturing of DC loads this is now at hands of specialized brands in China.
Production of LED lamps or mobile phone charger, or of any USB gadget, this created at mother China the need for professional grade aging systems (DC loads).
The main idea this is large scale testing of products life cycle, them be tested enclosed in testing cabinets.
All that is required this is a Master control unit ( DC load parameters programming) and several DC loads all working at Slave mode.
Such slave units could be 10 or 100 in numbers.
Basic specification
RS485 international standard communication protocol
CC / CV / LED load mode
Each channel can be independently set Load parameters
Aging tests for non electrolytic capacitors , and relays and other components prone to failure type.
Its one Slave unit at max 500w this is priced for 80 Euro.
I am not posting any brand name or links, because such brands they talk only with factories, these are their customers and no one else.