good evening youtube i've had this in supra power meter i've been using this for i think
about seven or eight years it still works fine for normal operation i use this on my small grid
tie inverter this monitors the amount of energy produced each month and that again works fine
except if there's a power failure it resets the kilowatt hours back to zero so apparently
there is a small battery in here a 3.6 volt nickel metal hydride supposedly looks like that
and apparently that's the backup battery so i thought it's june 30th tonight so i've
recorded the power reading for the month or the energy reading and i figure i'll try swapping
the battery out tonight and then we'll try it in the morning and see if it works here
okay there we go finally found a good screwdriver i think these other ones were a little too pointed
this one's kind of worn out and it usually doesn't work but it was the perfect fit for these screws
so anyway got that yep there's the batteries yeah so i'll put a link to the video that lawrence
francis made about a year ago where he repaired his kumon meter that looks exactly like this in
super meter so i'm not sure who who's the actual manufacturer of these but you have the exact same
batteries and i ordered the batteries off the ebay link that he posted and that looks the same
so let's check the voltage here supposedly plus is on the inside or towards the middle oh yeah there
we go 1.234 volts that is why it doesn't hold memory so this is basically the memory backup
battery and you can see the new battery here is 3.8 volts right there so yeah i think that is the
problem otherwise the meter works fine it just if we lose power i lose my accumulated kilowatt hours
for the month so now i think i need the small screwdriver here there should be two screws i
think yeah so there's your current shunt right there so that's what measures your ac current
looks like there's a crystal for the display a crystal for the onboard power chip that's probably
your capacitive dropper this creates the low voltage power supply for the chip it's a little
hard getting this apart because you've got these really heavy gauge wires yeah there's
the chip on the bottom there there's a solder terminal there and one over here okay yeah i got
one side of the battery out there's a diode that sticks out and you have to get around behind it
to get to the battery connection this side over here is okay because the battery terminals on
the outside but this one you had to kind of come in from an angle i couldn't see that
before okay there we got the battery out you can see plus and minus there so that was the correct
polarity okay success it was actually pretty easy to get the battery in just spread the terminals
or the pins apart so they line up straight with the two holes and then i just got the
pins into the recesses in the circuit board pushed down with one finger and then just
touched the soldering iron to the pad on the back and got the negative side in about halfway
and then did the same on the positive side it pushed in all the way and then went back to
the negative and pushed it down and then just had to touch up the solder joint there cleaned
off some of the flux so i think we're good on the battery there 3.8 so it's not shorted or anything
okay looks like it works i don't know if this will actually work with the memory but let me
go in here this is my trick that i use on these so if you hold the cost button down it'll flash
yeah there we go so i'm going to set the cost to one dollar per kilowatt hour
or one unit and this screen here reports your watts and then the cost
but since my cost is one every kilowatt hour adds one here so i get watts plus kilowatt hours
let's see we should have that stored here if i walk through there's kilowatt hours volts low
high and there's my cost and then we'll go back to that screen now i'm going to turn off the meter
so now let's turn the power back on and we'll walk through here kilowatt hours
there's volts high low hey we got it it remembered the cost so the memory is fixed and
let's see let's look at the volts so you can see my bench meter is reading 120 and this is reading
i wonder how low this thing will go here that's about 110 110.5 let's go down to like 90.
90.5 yeah you know within a half a digit oh there's 80 volts there's 70. up you can see it
it's probably getting right right to the limit 70 and then it drops to 50. yeah i guess 70 volts is
about the bottom end there let's go back up to 120. hey i think we got her fixed so now i can
plug this back in and starting tomorrow july 1st it'll be recording power so let's see last month
in june we had 72.35 kilowatt hours for the month from the grid tie system and now i don't have
to worry about losing the data in the middle of the month put a link to lawrence's video he goes
into a little more detail on the battery and he also checked some of the capacitors and whatnot
his meter he was having bad voltage readings and i've heard other people have the display
might go out and replacing the battery fix the display so i guess depending on
how bad the battery gets it might cause the uh power chip in here this reading the
the power i guess if that battery goes to zero it probably shorts out the memory pins and then
it doesn't operate at all so yeah there's how to fix one of these this thing like i say i think i
bought it in 2014 and it's been going 24 7. this has been plugged in around the clock
all my data has been recorded on this meter but if i got a different meter it might read a different
kilowatt hours so anyway i figured repairing the old meter since it worked is a better fix so yeah
i'm going to go plug this in and we'll be up and running tomorrow morning when the sun comes up so
yeah if you found that helpful give the video a thumbs up and as always thanks for watching