Hi, welcome to a product review by Robojax. in this video we are going
to do the test for this JUNTEK VAT4300 wireless power meter this is the
shunt current resistor for this. this and measure at the 300 ampere and the
maximum voltage is 100 volts DC and can display power amount of energy and
multiple other options let's get started with this
My Name is Ahmad Shamshiri and I am presenting this review from Canada
I was looking for a decent current sensor and this is one of the best
option that I found this needs just 12 volts power which I've connected to
power supply but I could also find a lithium battery to just attach it here
and this will just work fine have tons of feature it can display as you can see
on the screen it can display the voltage current temperature there is a
temperature sensor attached to the device which I am going to show you of
the sensor. you can also set the battery capacity and monitor battery capacity.
and the time that this one is connected. also when you come in this screen you
can set the negative current protection when the current goes in the other way
sometimes you have a charger and a power source so this can be set negative.
current protection . over current protection when it is up the over
current protection under current protection over-voltage and
under-voltage protections or a feature that you set those values and if the
amount of voltage or current goes beyond those values it can control and
turn on relay and you can connect your load through the relay so the load is
protected if the voltage or current goes beyond.
the limit you can set the battery capacity a lot of other features with a
price of about $30 u.s. or CA$36 Canadian this is a best deal
that you can get. I purchased this JUNTEK VAT4300 from this store on
Aliexpress $37.43 CAD.I purchases from another had Express store but this is
the actual official JUNTEK store as you can see they have different models
100A is sold for about $26 dollars. and this is the one that I
bought and on $30 u.s. I will provide you the link. there is no affiliation
between me and the store.
Hardware Explained
let's now open the box and see what we have here. we have a wiring diagram VAT
quick guide. description anyway so we have few pages. we have a temperature
sensor with the connector .this wire and connector and also micro USB connector.
this is the actual meter JUNTEK
and this is the power. external power to power this up. usb on this side and
that's it no more options here. and this is the current shunt so the current
passes through here. and we have here some connections. and let's open it at
this point.
and here how it looks like here. this has been rated at 500 ampere 75 millivolts
where you will insert your cable and tighten it or maybe from the side. I am trying
to connect the cable, and then un-screwing this as you can see from this
side. the nut is rotating it's not tightened and how can I access it to
hold it from this side this is a very bad design. At this point this is all soldered
and I cannot just pull it to tighten this.
well why didn't put the sample connector so you can plug it in and remove it how
somebody would be able to connect, connect this in here without holding the
other side this module that is used for wireless is NRF24L01 2.4 gigahertz
transceiver. after removing everything now I'm able to open this. and I want to
make sure that I can pass it through this.
now I've connected the wires and this can be brought here let's see if it can
fit
you
Wiring Explained
let me explain the wiring. this is the positive of my power supply. It has been
connected using a bolt and it is connected to my load and this is the
negative of power supply I've connected it to this point where the terminals are
here. and the negative goes passes through the shunt resistor. and from the shunt resistor it
goes to the load. so these are the two wires that are going to the load this is
going to the positive of load and this is to the negative. this is the Rigol
electronic load DL 3031 and these are the two terminals that from
the circuit will be connected in here. and we will see the voltage here and a
current. here from the left second and third this is ground and this is a power
for this module we have to connect it to somewhere between 10 to 30 volts as soon
as you connect this you will see that the LED is turning on. we need to connect
this to the power supply to the positive of the power supply and this is the
wireless display this is connected to the 12 volts of power supply that I have
connected the same power supply to this (shunt). and pay attention here as you can see it
shows now the signal and because we have power here because this has power we are
seeing there. if I just connect the power of this you will see that that symbol
disappears. so the power to this will be displayed here if the communication
happens. voltage is the voltage of load and it is getting it from this point
and let me just connect it that's wire if I if I just connect this you will see
that the voltage will disappear. now there is no voltage connecting it back
now this is properly working.
connecting the temperature sensor
Let me demonstrate connecting the delay. I've connected the two wires of the
relay and the two last terminal the negative is on this side and this relay
is very tiny with comparing to the actual relay that is needed. for this is
just about 20 ampere relay and we need 500 ampere relay which will be very
large with big contacts. but I'm just demonstrating it that there's the output
power comes from this to this so the relay can connect or disconnect the load.
Relay can be connected to protect the load against: over-current, under-voltage, over-voltage and under-voltage
For demonstration purpose I'm to show you when it turns on and off
based on the current or the protection that we turn on. so let me just set the
over current protection. I am at over-current this when you see the green here
I'm going up let's say I'm putting it at 18 ampere now over current protection
shows it is at 18 and it's not on when the when the over current protection
kicks in you will see the LED will turn on and this will click and meaning that
meaning that the load is connected by the contact of this relay and you have
when the current goes above the limit view below the limit or a voltage goes
above or below the limit you can turn it off using the relay now let's check it
it's 10 ampere I'm going 11 pay attention here when I change it it took
almost 3 second because of the wireless so it's not real time at there is 3
seconds delay 12 13 14 15 as you can see I changed it .16 17 so pay
attention to this relay the light and also the contact kicked in and also you
see the over-current OCP on the screen. now if the power was connected where
this relate these contacts would have disconnected it and the power will be
disconnected because the current reached 18A. and of course you can set the value
between 0 to 300 ampere as you can see here when I talk here as choose between
0 to 300 you can set it.
the flow change time zero to sixty second display inverse if we set the
display verse on and off you can see that we can set that screen to be white or
darker and if I press this again at exits so we have so many settings in
here. after the set we have had a dress every time I press it we are changing
the address right now it's just connected (to shunt wireless) we cannot read it so 104 is
the one that we are getting signal and if you do not touch it for a few seconds
it will exit and as you can see our batteries are 63%
current and power measurement demonstration
as I've shown you the load is now connected to my electronic load
interface via USB which I'm going to show. you active on Canon that I can
measure with this device is 60 amp ere this is now at 6 volts as you can see
my multimeter shows 6 volts and also here it shows six point one volts and
let's put it a 10 amp (I )click OK. and connect as you can see this shows 10 amp
and this also shows 10 point 1 amp 100 milli ampere difference but with 10
amp that's still acceptable let's go for 20 now this is 20 ampere the current the
20 ampere current is now drawn to my to this load and as you can see it shows 20
point 1 amp yes it's exact. let's go 30
now I changed it to 30 and here it shows 30 amp at the voltage is 6 volts
the power that is consumed is 173W so this is the time that I have turned it
on I can press ok and her amount of energy is shown here.
you can set the battery capacity and you can set so many other values so so
far it's very accurate let's go 40 amp
39.9 that's 40 ampere very impressive let's go 50 amp
we're getting 50 unpair reading wirelessly that's extremely useful a
nice. and here is electronic load screen 287 watts is
being dissipated on my load.
let's go 60A and now it's 60 amperes it shows 60.2A or
three perhaps it's 250 250 milli ampere difference but very impressive perfectly
working.
Current/Power via USB
now let's test why our communication this has wireless and wired what it
means is if you connected via USB to this point which is a microUSB connector
and the other side connected to this point as a host. let me disconnect the
power for this first yes so this is now powering up via USB and the sample has
changed here now it shows wire and the voltage is shown let me turn on the
current
60A ampere is drawn and this is now working with a USB. if you're interested
to connected via USB. that's also nice I do need to connect this power just
connected by USB connected here and it's powering this up
Conclusion Remarks
for conclusion what we can say is that this is amazing they designed this piece
that's very nice there is one important issue and that is the these nuts or
designed very badly and if you connected and inserted it will be very problematic
to connect these wires this needs to be changed and somehow this should be
arranged this way externally you should be able to tighten and untighten it or
even at the bottom as I have shown you it's very hard to tighten the nuts and
also there is no jumper wire they are already been fathered and that is very
bad. other than that this is amazing device very reliable the current and
voltage the calculation everything is good. the communication is good also you
can have USB direct connection between these two to eliminate using of external
battery I definitely recommend this and this is one of the best deals that you
can get. thank you for watching this was a review of this JUNTEK VAT4300
Wireless which shows up to three hundred amperes, I've tested it with 10A.
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Subtitle typed and corrected by Ahmad Shamshiri on Jun 21, 2020 in Ajax, Ontario, Canada
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