Sounds like you get what you paid for, unfinished software and 4 different people writing the data sheet. well you did boost the amount of bucks they have. 🙂
I wish these guys would focus on bringing some modern topologies to mass market, eg GaaN FETs, synchronous operation& rectification, much higher quality inductors. The efficiency on all these cheap modules sucks, and they focus on displays, buttons , gimmicks instead of the core functionality. I'd gladly pay the higher BOM for modern designs, it'd still be much cheaper than buying the boutique designs that pop up from engineers in Germany , etc..
You could take these cheapish units and replace components that fail with higher quality components? Its one of the reasons I asked about longevity testing.
@@MiniLuv-1984 On the small modules you can try to get one using the least obsolete chip possible, improve cooling, sometimes add a beefier shottky diode if they skimped and mis-labeled a 1A diode as a 3A etc. On the larger boards you could replace with faster/lower resistance MOSFET, faster/beefier diode. And critically, a much better inductor such as something from CoilCraft. But alas...you are still just putting lipstick on a pig. These are obsolete designs using obsolete (and often fake) components. A synchronous converter replaces the switching diode with an actively driven FET , thus avoiding the diode voltage drop altogether. Most people who use these modules think they are getting much , much higher efficiency than they really are. Bordering on a state of denial frankly. Consider for a minute a modern (and relatively inexpensive) PC motherboard: It is in large part a giant buck converter turning 12v into *several hundred amps* of finely regulated 1.5v. Or open up the marvel of a modern mass mkt Hi efficiency server or meanwell power supply, or the current crop of tiny GaaN USB-C chargers. Far too little of these massive advancements in power electronics tech we have seen over the past 15- 20 years has made its way into these garbage buck/boost modules. .
I wish they'd put larger input/output terminals on these things, and maybe split the positive/negative and move them apart for less short-out potential.
I'm actually really curious to see if someone can tap into that COM port on the right and if the overall performance of these modules can be tweaked/improved in any way to make them better. People don't seem to happy with their performance, despite their nice appearance :)))
Hmm - it seems the chineese don't care much about numbers in their datasheets (input Vmax 90V/100V whatsoever...). With 20+ bucks they are not really on the cheap side, but capable of some power it seems. I wonder why you didn't really test the power capabilities of these devices - thats the first thing for me when i buy a new buck- or boost converter. In most cases you cant trust the marketing values and you can only use 50...60% of the stated values for a longer time without additional cooling. Also i would have loved to see converting effeciency and stability of output voltage/current on some demanding loads.
It would be interesting to see how much power you can send along a thin wire pair boosting and bucking, doing a rough calculation on losses at different voltages, seem to remember you had plans for something similar a while ago?
How can one test these buck, boost and buckboost converters longevity? It seems letting them run for weeks or months is not a real test. I could run them from a solar panel to give them on/off testing and perhaps load them with a inductive load - a fan or something....something I can setup and forget?
I have bought three of the DPX800S and was disappointed: Two are working (more or less), except for MPPT. When trying to use MPPT it just flaps between on and off, effectively becoming pretty useless. The third one failed seconds after startup and now has a short on the input. If someone has figured out if the MPPT function is useable somehow, I'd be glad to hear about it!
Aren't these just recycled older boost bucks with a few better parts, same software... They don't make them high enough voltage or current, if they made better connections and holes to double up.. be nice.. I end up making my own as I just don't off the shelf or off the shelf value
Can you make some extra video or just share in comments which way do they control feedback loop for ic to achieve digital control for volt and amps? Digital pot?
