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2023-11: Warosu is now out of extended maintenance.

/diy/ - Do It Yourself

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1774218 No.1774218 [Reply] [Original]

My roomate is going to burn ny house down


Look at this shit.

Fucking idiot

>> No.1774229

Am I stupid, or whats wrong?

>> No.1774371

>>1774218
lol chill the fuck out that's low voltage DC power probably 12 volts. I see two batteries connected in parallel and a cheap solar charge controller. nothing to be concerned about fag. locating the components in a metal box is going further toward safety than most people do.

>> No.1774375

>>1774218
what the hell's wrong with that, the only thing slightly disconcerting is the presence of the memeberry pi.

>> No.1774384

>>1774218
OP stop being a luddite and learn how electricity works.

>> No.1774391

>>1774218
Besides gen workmanship no grounding, no cable protection on box exits, no covers, exposed terminals and what suspiciously looks like an alligator clip as a terminal, I see nothing wrong with this low voltage contraption. Being 12vdc, not even an electrical inspector can touch this. What the fuck is wrong with you OP? Fucking idiot.
t.engineer

>> No.1774500

>>1774218
Nice bag.

>> No.1774516

>>1774375
burning house down due to SD-card-failure-induced crash confirmed

>> No.1774540

>>1774218
Solar?
>>1774229
Tryna figure this out too. What's the problem?

>> No.1774543

>>1774218
is the plastic shed that this is in near your house? if not no worries

>> No.1774676

shut him down or put fire department on speed dial..

>> No.1774733

>>1774391
>alligator clip as a terminal
That appears to just be connected to a meter and may be useful if looking at the voltages from different spots in the system.

>> No.1774749

>>1774218
Maybe OP could tell us specifically what is wrong with the setup. Or did you just think "ahhh electricity, scary!"

>> No.1774912

>>1774218
The only thing worrisome about that setup is how big are the wires going from the battery to what appears to be an inverter. a 1500 watt inverter needs 1 gauge wire for runs under 15 feet.
2000 watt inverter needs 00 gauge.

700 watt would needs 6 gauge.

>> No.1776242

I would consider a fuse at the batteries.

>> No.1776482

>>1776242
there is one

>> No.1776487

besides the shitty cable management and lack of labeling it looks fine

>> No.1776509

>>1774391
You would ground a 12vdc system? Lol engineers.

>> No.1776510

>>1774912
This also those probably found batteries aren't going to have a nice or long life. Don't buy a battery off your housemate OP

>> No.1776516

>>1774218
what's being powered by this I see maybe 50 or 60ah of batteries. That's gonna give you maybe 1/2 hour at full chooch. 1 if they are in parallel

>> No.1776523

>>1776509
Care to explain yourself, retard?

>> No.1776527

>>1776523
Why would you use an earth ground on an isolated DC circuit?

>> No.1776535

>>1776527
Welp your car is earth grounded. By your logic it shouldn't but the static discharge from your tires would kill you.

You ground the metallic enclosure in these cases and make the positive common for >48vdc . The point is if a wire let's go it shorts on the box and blows a fuse. That is, if there was a fuse, a door, etc. Def not in this case but it's generally good practice unless it poisons the circuit. If he had good upstream protection, his lack of bushings cutting the cables would show this effect. Btw if you have a cut, 12v will kill you. If it was a plastic box there's nothing to ground except the circuit itself with grounding bushings and shit which likely doesn't apply here.

Its just for good practice anon.

>> No.1776551

>>1776535
>Btw if you have a cut, 12v will kill you.
Is there proof for this claim?

>> No.1776556
File: 3.75 MB, 280x302, 1514860879706.gif [View same] [iqdb] [saucenao] [google]
1776556

>>1776535
>your car is earth grounded

>> No.1776565

>>1776556
No it isn't. It's called a floating ground. There is no such thing as an earth ground in DC as that would drain your battery to earth. The only DC system that's grounded is in marine application where you're trying to mitigate galvanic corrosion.

>> No.1776568

>>1776565
New in town, sailor?

>> No.1776594

I'm guessing your room mates a low IQ engineer that thinks because he did a module or screwed in a light bulb he has a scientific grasp of electricity.
Install a smoke detector or evict the dimwit.

>> No.1776619

>>1776565
Oh look another armchair intellectual with no practical knowledge whatsoever. Take a meter and measure 12 positive on your car to earth ground. Post results. Go on were waiting. I look forward seeing you hang your head in shit posting shame.

>>1776551
Internal body resistance is like 500 ohm bro. Rare but it happens.

>> No.1776625

>>1776619

if you measure from positive to earth ground its measuring the voltage differential not that they are actually connected.

>> No.1776662

>>1776619
>he doesn't understand voltage potential

>> No.1776667

>>1774375
>>1774516
and what would you use?

>> No.1776673

>>1776667
op-amps

>> No.1776683

>>1776625
He's either not an engineer or he scraped by at the bottom of his class, not understanding the basic fundamentals of electricity. We DO NOT use earth ground as a 0 potential reference in a DC system.

>> No.1776735
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1776735

We DO NOT use earth ground as a 0 potential reference in a DC system.

Depends on what you mean by DC system.

PC power supplies have their negative tied to earth.

It is also common practice in control cabinets.

A lot of PLC manufactures prefer to have a grounded negative.

In an S7-300 configuration with grounded reference potential occurring interference
current is dissipated to the ground conductor/ to ground.

>> No.1776762
File: 1.05 MB, 1025x1366, IMG_20190531_145504-01.jpg [View same] [iqdb] [saucenao] [google]
1776762

>>1776619
You are a fuckwit eh?

>> No.1776776

>>1776683
>what is negative dc grounding for automobiles
>what is positive dc grounding for telcos
>what is static electricity
>why some cars use ground straps
But even more damning is the fact that a rod in the ground attached to an incandescent attached to the positive post of the car battery lights up an incadencent a meter away depending on soil conditions. This is not coupling. It's referenced, through the tires. You either don't know what your talking about or just scraped by the bottom of electrical safety practices.

As this guy >>1776735 says it depends. I can show you a 6000hp dc motor that cannot be earth grounded or the drive faults.

>>1776762
Is that all you got? I was hoping you nitwits could prove me wrong but all you ever have is insults.

>> No.1776826

>>1776762
> arduino
> shield
look out everyone, a real expert.

>> No.1776876

>>1776826
How about an EE shipped to defcon China or can you only read the most basic of instructions?

>> No.1776944

>>1776876
who are you trying to impress, exactly? you attended defcon, wow. Anyone can do that, it's hobby tier.

>> No.1776996

>>1776762
>say dumb shit
>people call you out
>"n-no you can't do that, I'm a hacker, look at my pro hacker arduino shield"

>> No.1777267

>>1776535
oh lawdy

>> No.1777292
File: 964 KB, 680x882, 1572338879684.png [View same] [iqdb] [saucenao] [google]
1777292

>>1776762

>> No.1779107

>>1776565
>he doesnt know how to use the 3 seashells

>> No.1779109

>>1776509
Fuck you bitch. I've unironically grounded 0v systems.

>> No.1779119

>>1774749
This is the very real and very unfortunate result of the American public school system. Despite electricity playing a major role in just about every aspect of our modern lives, the only general education we’re given on it is that it’s potentially dangerous and should only be handled by experienced individuals. It’s mind blowing to me that basic electrical theory and at the bare minimum ohm’s law aren’t included as core curriculum, yet I was required to memorize and identify the various types of fucking cloud formations.

>> No.1780190

>>1774912
Where do you get this from? ONE GA. for 1500 watts? WHAT?

>> No.1780217

>>1776565
What? How does grounding a battery run it flat?

I've grounded batteries before to have a common reference with a mains connected appliance.

>> No.1780325

>>1780190
1500 watt output from an inverter would require 125 amps on the 12 volt side of the inverter for a short run of 150 amps 1 AWG is fine. wires in free air of course. if you're going to run it continuous then then go to 00 AWG.

jesus look it up fucktard.

>> No.1780579

>>1776876
Enjoy your corona, you inept wannabe.

>> No.1780765

>>1774218
Did this Jew really screenshot a pic that was already in his gallery?

>> No.1780900

>>1774218
You should get your roommate to add a fuse into the charge controllers battery positive wire. Preferably at the battery end.

>> No.1781019
File: 257 KB, 1267x698, hes buggered off.jpg [View same] [iqdb] [saucenao] [google]
1781019

>>1780900
there is one, look at the picture. also OP is long gone.

>> No.1781021

>>1774371
>only voltage is dangerous
wrong

>> No.1781024

>>1776535
>Welp your car is earth grounded.
closest thing to reasonably correct

>>1776565
>>1776619
>>1776625
>>1776683
all absolutely and fundamentally retarded

>>1776735
>>1776776
this guys is cool too

>> No.1781075

>>1781019
No, there isn’t. There are two wires going from the cabinet to battery positive, one of them is fused, the other is not.

>> No.1781506

>>1774218
He should be using clamps, not just stuffing wires through openings in the box.
Also, not sure what sure what those two spools of wire are for. Resistors?

>> No.1781512

>>1781506
Never mind OPs stupidity. Just read this thread it's fucking hilarious!

>> No.1781694

>>1776565
>The only DC system that's grounded is in marine application where you're trying to mitigate galvanic corrosion.

In factories the negative side of the 24VDC is also grounded.

>> No.1781938

>>1779109
and... how did they react?

>> No.1782334
File: 2.77 MB, 3984x2988, IMG_20200216_120017.jpg [View same] [iqdb] [saucenao] [google]
1782334

>>1781506
is putting wires through holes a problem?

>> No.1782400
File: 79 KB, 728x551, imgbin-flail-weapon-chu-mace-arma-bianca-weapon-Apts0tSkwmpvdPGKBvXedb8Lb.jpg [View same] [iqdb] [saucenao] [google]
1782400

>>1774218
Flail weapon that faggot

>> No.1782432

>>1781694
48vdc systems are grounded at the positive side for cathodic reasons. It's shocking what happens to the posts when a tech screws that up, fast too.

>>1782334
It sure is without a connector or a bushing or something to stop the sharp edge of the box cutting the cable. Technically that box is not to code.

>> No.1782669

>>1782432
I'll buy a clamps eventually, it's held in place with clamp straps along the run so the wire cant be pulled out. I may put it in conduit though so idk.
its a portable structure so codes dont apply.

>> No.1782683

Honestly most dangerous part of this is where he put the inverter there with restricted cooling,

Everything else is fine

>> No.1783029

>>1774218
Electrified cuckshed

>> No.1783625

>>1779109
Get on my level. I grounded a 25psi system using fibre optics.

>> No.1783664

probably op just want's some props for his selfbuild electricity stuff

>> No.1783692

>>1782334
when you build boxes like that it is.