hi welcome to product review by Robojax my name is Ahmad Shamshiri. in this video I’m going to
inform you about a scam that product is sold by this brand JUNTEK and they call it bts 900 watt
I bought two of this one is here the other one is here both of these are from the same brand here
juntek and they are labeled 900 watts but they do not even deliver 500 watts 400 watts they're less
than 120 watts or 200 watts with certain voltage but none of them deliver 120 volts or not even
80 volts and then I found this different version I thought this might be different and I purchased it
then this arrived and also this is exactly the same as this one they just replaced the display
the rest bottom portion is exactly the same except this module at the top this also does not work so
I’m going to test it and show you that this does not work this is just junk do not waste your money
do not uh buy it because this is a scam and I don't know how people get fooled when you turn it
on it shows output 120 volts but never delivers the current so voltage is not just important
do not get fooled by this voltage you have to have load this is supposed to provide 15 ampere
at any output voltage that you want with the maximum current that cannot reach more than 900
watt but this did not do that so let's start it I’m open to learning if I made mistake or
something if anybody is able to get 900 watt 800 watt even 600 watt please let me know
I’m willing to remove this video and learn and test this
post another video with that even 600 watt but the problem is it doesn't even output
and here is a page where I bought it from AliExpress fancy module
that I bought it twelve dollars for the price 1179 and
959 960 for the shipping I received it in about 30 days input is 8 volts to 60 output up to 120 volts
an input current 15 it says output current 15 ampere they did not mention here the power but
they put here and the title the bts 900 so they are referring to 900 watt
if you divide 900 by 120 volts you get 7.5 ampere here is the link that I purchased
as you can see 13.77 cents plus shipping and this is the module so they're advertising it as
900 watts it to 60 volts boost to 120 volts and here these are the main features of this
input 8 volts to 60 volts output 15 ampere input current
and output is 10 to 120 volts 85 percent but I did not mention so output is 15 ampere
so from the back pay attention this is led
and let's see the difference it seems this is exact pcb
amazing look at the look at the pens and this connection exactly the same
so even all these pens the lines are exactly the same
this portion the large portion is exactly the same on the module the capacitors the winding this is
amazing how the lcd and this will display the same thing so it seems that this input let me remove
it to show you all these components are exactly the same so they have just swapped the display
so immediate impression is that this will fail the same way as this did but I’m going to test
it maybe if this microcontroller is here maybe if this can help because actual microcontroller
and the display driver is different because this is led and that's for lcd driver
let me show you my power supply that's connected via this
thick wire to my electronic load on this screen and here you will see the voltage
which shows around 51 volts so let's say 50 volts and here it shows the current and the power
and also we will read it in here as well so let me turn it on
now 1500 watt so 30 ampere supply I have 50 volts I can reduce it or increase it
up to 60 volts and still I can get 30 ampere so we have enough power
for the test purpose because when I contacted juntek they said you don't have enough power as
you can see I have power I have 1500 watts so please don't tell me that I do not have enough
input I have enough input power as much as this module needs up to 1000 watt 1500 watt so we have
power so there is no issue of the power and here I’m gonna change the input voltage as you can see
and here pay attention the current is 30 but the power is reduced when I reduce the
voltage so I can go any voltage I want and you see constant current 30 ampere we have
so I can go 50 back
so I have 50 volts and 30 ampere which is 1500 watts
let me turn it off so we have it
the current is set 15 ampere maximum voltage is 80 volts and here
now so now it's set it so output is now 80 volts I’m going with 5 amperes let me turn it on
as you can see do not tell me that it's insufficient why this constant current is
turning on it means the current reached the limit whatever this can accept the current
reached the limit and it is turning down the voltage as you can see the current is 5 ampere
but the voltage is not 80 volts so some sitting is wrong something is wrong
and as you can see this is the second one this is a and that's the new one
npr is 70 37.8 volts so that shows also the output because there is no load and I have not turned it
on you will see the output voltage current and power on the same screen so let me turn it on
now if I press this you will see that I have set the output to 80 volts and 15 ampere so if you see
900 watt divided by 80 volts so you should get 11.12 ampere but I’m trying it just five not even
10 or 11 so now let me turn it on and output is set to 5 ampere as you can see
the voltage is slowly increasing on the load but the current as you can see is 5 ampere
and that said so the power is 273 watts this is not even 80 volts so it does not give you 80 volts
and here if I press this you will see that I have set the maximum current to 15 ampere so there is
no limit and my power supply can supply up to 30 ampere for this so I have enough power no
worries I’ve set output voltage here to 120 volts maximum 15 ampere and I have enough power here
input is now 37.7 volts and I’ve set the maximum current to 5 ampere on my load so let's turn it on
now it is on so 5 ampere the voltage now dropped it's not 80 volts or 120 volts
so we get only 272 watts and this is not working I tried every possible ways
so please refund my money this is just junk the voltage dropped significantly and it doesn't
supply and this led is turning on that shows that constant current has kicked in to block it
thank you for watching this was the review so at least I warned you not to waste your time on these
not waste your money on these and please inform your friends so nobody should buy this junk and
waste their money thank you voltage is 80 volts current is 15 ampere when I press this it saves
it and comes here it shows the voltage and current at the moment the load is not on let me turn it on
with three amperes so the voltage has dropped because this constant current led is on
remember I have 30 ampere here with any of the voltage that I enter I can supply up to 60 volts
here at the input but my concern is that we should get 80 volts we are not getting so
this did not work and the other one also did not work this one also did not work