#44 Poor Man's DC shunt to measure high current

[Olwmatt]

i would like to copy your build, and would like to know more aabout connecting which wires to which posts

[Kalkaekie]

Enjoyed the video, very interesting, thanks !!

[RoadWarsOnSky1]

You sound like a guy who knows his stuff so I have a shunt question/problem I have come across.Anyway I am using a 20amp ammeter 75mv and I have a 75mv shunt 20a I have my ammeter connected to a wind turbine and the maximum current from my wind turbine is 17amps,But on a less windy day I produce 5amps but my ammeter is on reading 0.5amps.But I cant get a lower amperage shunt because they wind turbine will exceed the ratings.What is the probelm and do you know a solution

[ZeroFossilFuel]

A shunt is a very small known resistance that drops a calibrated amount of voltage across it as current flows through it. Your 20A ammeter already has a shunt built in. The meter movement is 75mV for full scale. By adding an external shunt you have two shunts in parallel. This will produce inaccurate measurements.

You COULD put your external shunt in series with your ammeter and a mV meter across it. Both meters will now show the same current and drop 150mV total. But that's redundant.

[paytontech]

Not t nitpick but 15mV is 15/1000V, not 15/100. II know you know that and just accidentally said the wrong thing. Happens to me too sometimes.

ref: 3:02

[ZeroFossilFuel]

@paytontech Yep. You're right.

[ZeroFossilFuel]

@CADtekk Not bakelite. Masonite. Very common.

[coilsinamotor]

so its a resistor

[ZeroFossilFuel]

@coilsinamotor yes

[coilsinamotor]

@ZeroFossilFuel oh i c

[ZeroFossilFuel]

Someone was kind enough to point out to me that I forgot to demonstrate how to calibrate this shunt once it's been made. Take a look at this tutorial link he shared with me.

reuk. co. uk/Make-a-Shunt-Resistor. htm

[InvalidMemberAccount]

You are doing REAL science!!

Great Work!

[harpersteven]

nice one!

[gibs7]

Keep up the good work.

[MemrabPenhest]

I wish I'd watched this when you posted it yesterday. Would have saved me $10 on an amp meter and still will in the future.

Dropped ya a measly 5 bones on the paypal and would ** thoroughly encourage others to make some small donation ** .. even a buck. There are lots of folks posting electrolysis results on youboob, but you sir, are the only one supplying detailed explinations, whys and wherefores that we need to develop an understanding

It IS cold out in the garage lately, isn't it?

[ZeroFossilFuel]

Yes, it is DAMN cold out in the garage lately. :-\

[hopeitshappy]

It IS cold out in the garage lately, isn't it?

it is here lol ive had to come inside

[itwasthedog]

ZFF - You haven´t given up on the OSPMM have you? I´d like to see more of that thing.

Also, can you think of a way to efficiently gather the hydrogen and oxygen seperatly? Playing with a fuel and oxidizer mix sort of makes me nervous...

Good luck and happy experimenting!

[ZeroFossilFuel]

OSPMM lives. I'm waiting on results from an experiment being tried by another.

[IRISHPRIDENINJUH]

on the torch, why not put one of those tube valves on it? like a regular torch, they all have little knobs to open and close the gas flow, sorry, couldnt comment on other video...

[ZeroFossilFuel]

Bad idea. You need a much better flashback arrester for HHO. Trust me.

[IRISHPRIDENINJUH]

yeah, plastic isnt the strongest stopper... i am new to the hho thing, I am more into self perpetual generators...

[ZigZagStardust]

What is the running temperature of the cell when installed in the car you wish to achieve taking into account the summer temperature's plus under hood temperature in a vacuum.Seams your testing is going the higher voltage lower amperage way. Guess in the car your going to use a step up transformer? Thank you for letting me pick your brain a little. Looking forward to your next video!

[ZeroFossilFuel]

Convection driven circulation is so strong from my tall plate column design that cooling is not a problem. Cell has been running around 120*F on cooler days, 140*F on the hottest Summer day I tested.

From 14VDC I get 2.3v/plate in the series cell stack which seems to be the sweet spot. Electrolyte at present is just concentrated enough to draw 25A.

[ZigZagStardust]

Hi, I have been looking through your videos for the last week and have been intrigued with your work. What plate thickness do you currently think to be best if you were going to start a new cell that was going to be installed in your car.. What about cell production under vacuum, have you thought of that at all?

[ZeroFossilFuel]

No best thickness but for long term duty definitely use 316L.

Vacuum does seem to increase output but I haven't compared it yet. It may be just that it just increases surface tension allowing bubbles to form more easily, making it easier to see the gas production that was already there. Tests will follow.

[johnHutt]

Zero, YOu are the man the HHO man. Thank you.

[crazzieg]

Verry good. I was wondering when someone was going to do this. Been building shunts for a long time. Some of the UPS systems I worked on ran at 480vdc @ 10K amps surge startup.

You do such good work. Keep on going.

[RuiFranciscoVieira]

thank you

[zezimashock]

cant you make somthing with statick electricity or somthing like that dont now how to spel it in english

[finlander1000]

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If you check that YouTube video you notice that hi has been increasing the plate area to get more efficiency.

[finlander1000]

If you increase the cell voltage, you only loose power in heating. But if you lower the cell voltage and increase the current by larger plate area, you might get higher efficiency. The other guy is using 7 series cells and 12.9 Volts and getting almost 90% FE.

[ZeroFossilFuel]

I don't doubt he is sincere in his belief but I seriously doubt the accuracy of his results. I would have to see it in person for myself.

[Calliber50]

Good work on the DC shunt. I'm more familiar with CTs to get a 0 to 10 volt reference. You could also get clamp on meter. Fluke makes some excellent ones. There's a lot of Fluke products on E-bay if you're looking for a bargain. I'm in love with my fluke meters and scope!

[ZeroFossilFuel]

Since when does a clamp-on amp meter measure anything but AC amps?

[december105]

check out the specs on the clamp type amp meters being sold now days they are listed for both ac and dc. check out a utuber named magdrive a video he just put up shows one in use on dc.

[Calliber50]

Fluke 336 and 337 amp clamps measure both AC and DC current. I'd like to know how! You made me double check my amp meter. I was like, yeah, what am I talking about. Sure enough it measures DC current.

[czarwright]

Very Smart Idea.