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The glowing red light means it's working.

I went on a rant about this too on this board a few weeks or months back. Makes me nerd mad.

I need a 200 amp battery man. My inverter pulls 20 amp hours.

Reminder that this is only a problem for the cheap ones. I experienced the same way back in my early car stereo days. The "name brand" breakers don't have this issue and you don't necessarily need to go the fuse route.

Yeah I'm gonna be honest. This isn't really an "open letter" lmao

I needed to be able to make parts with high temp materials so I finally broke down and got a resin printer. DLP Elegoo Saturn to be specific. The material I'm using here has a working temp of 160C so should be more than enough for diesel heater duct parts. This thing is a work of quality of I...

Bit dramatic. There are a few good sellers there. They're just hard to find and usually only from group experience.

That's a whole lot of assumptions and generalizations my man. Tons of happy customers buying from good sellers.

This is black magic.

I'm still looking for the problem here.

Just received from AliExpress. 4 undamaged cells, flat sides. Of course capacity test will have to wait a bit as it takes time.

That's not what a scam is.

10/10 assessment. Biased journalism is absolutely scummy and blindly accepting it is... not intelligent.

This is honestly an old issue. Just becoming more common as every dingus with a cell phone can start a youtube channel and companies start taking notice of prominent ones. Also, I don't believe it's legal for someone to not disclose whether or not it's a sponsored review of a product. If it...

Version 2. This one I think I will mix 4:1 with the tough resin and see if its more durable. Should be able to print the 4 parts simultaneously once again as the last one.

Basically, you're over voltage plain and simple. Rewire the panels such that you have two series strings of 48.6v in parallel and you'll never have an issue with that again.

4x 100ah with built in BMS suggests 4x 100ah 12v nominal pre-built batteries. If that's the case you REALLY don't want to go sticking the 4 batteries in series. That'll be 48v.

A US supplier bodes very well for the future of lithium DIY projects in this country. I hope this pans out.

Been just under a year, but they have been outside the whole time. Thus far no issues and I have used them for a few projects now. Also happy to report that my 240AH of battery will run everything I need for an entire 3 day weekend without any solar input.

So after a year sitting in the driveway I had my battery apart, and can report the Poron foam I used is holding up well and still seems to be appropriately "springy". I built mine more or less the same way as @justgary by measuring the total stack width and subtracting the foam compression...

"Essentially a simple switch". This is coming, or at least on the list, but requires significant monitoring and network infrastructure to determine which users should be dropped to zero grid output, when, and how quickly to bring them back up. As for batteries, that's a massive cost that most...

EMP protection is the 21st century snake oil. Nobody knows how to do it. Nobody understands what *really* causes it. Everyone thinks they need it. EMP protection for a consumer system is essentially nonsense. All you need is excellent surge protection on your grid connection. If a solar...

We'll call this revision 1. I found a few things I don't like, but the bayonet style locks worked out perfect with a slight click into place.

You can just power a relay/contactor from the BMS so that the large load can come through that, but when the bms shuts off it cuts the contractor... The contactor coil will pull some current on its own but likely will be insignificant compared to the load. You'll also need to put a shunt...

I have an acre surrounded by trees and brush. I tend to let my grass stay a bit long. I have voles and field mice and all manner of critters. I've never seen a single shred of evidence of a mouse getting into my home but I have found them in my garage. The garage door not have the same tight...

Any way to refute this? I've seen videos of tons of trucks sitting in line at ports not doing jack but waiting as fast as they can.

More than that even. The weld itself is nothing. The dead short it resulted in on the other hand is going to be a matter circuit resistance and voltage. For a single 0.39 milliohm. That alone gives you over 9200 amps possible, but of course drops depending on the material and connection used...

4 panels in series with 24.3voc is 97.2 volts. And that voc increases as the ambient temperature drops.

My first question would be if you actually need to pull 300a. Surge loads don't really have a huge impact unless they're way higher than "normal". Sustained 300a is a ton of power and warrants considering a higher voltage pack anyways.

Failed inspection due to cracks or whatever that could cause catastrophic failure. Decommissioned because something else failed horribly in the generator section and caught fire. Age regulations. There's a few reasons.

The lifepo4 cells themselves are not a fire risk. The DIY setup is. Installer/operator error.

One does not follow the other as a "given". They also have a 15 year expected life and cost a lot more than what us peasants use. It's not just a matter of high efficiency, but also practicality of cost and life which factor into ROI and end use. It's also very easy to extrapolate wild claims...

Oh I love this topic. The only thing is would add here is to watch out with the "closed" type and the "indentor" style crimp tools. By closed I mean as shown above with a barrel that goes through. These come in insulated and uninsulated types and the insulated ones like this should use...

I did exactly the same, but it's really easy to cut virtually any cable. Just look at how quick they cut the stuff you bought off the roll.

For example. There are many versions of these in all sorts of price ranges. https://www.heatso.com/webasto-thermo-top-c-water-heater-12v-5kw/

Step one of building my custom cargo trailer conversion obtained. Actually I bought it for other reasons. As part of my mech E course work we had a hot work class which covered the basics of everything from oxy-acetylene and plasma cutting to brazing and welding with stick, two types of mig...

Also I would add that the only stupid question is the one you didn't ask.

I wouldn't advise that. Even with filtering the condensation coming off copper and aluminum can be full of chemicals you can't filter out.

Not here to comment on any cause of the failure, but just the wiring in general. Looking at the photo, my biggest concern is not the rats nest of wiring so much as the fact that many of the wires lay across bus bars and terminals all over the place. If one decides to "self fuse" as you put it...

As stated, solder is by far NOT the best possible connection. It's one of the least reliable methods, and virtually no standards of termination allow it. Virtually every engineer who has ever studied the mechanical properties of a soldered connection would disagree with you. It has nothing to...

A temp sensor between the cells will serve as a pressure point during expansion which may cause the film to break or worse, the case. Of course the severity depends on the physical construction of the sensor itself. Most are a small junction which is effectively a tiny bead. Makes for one hell...

I assume you have good solid lug connections on thick wire and not just alligator clips and thin wires?

When elected President of the World I will ban IPAs.

Is this thread confusing dc negative with ground and using them interchangeably? That's kind of inappropriate to do so and it has always driven me nuts that the industry has adopted the term "ground". DC mobile equipment with a 12 volt vehicle and 12 volt components don't need a "ground"...

Or my personal favorite: "I don't do math, can't you just figure that out for me? Also I'm not going to tell you what devices I'm using, how many, or how long." Or related to that energy audit: "You don't need to know any of that stuff just tell me what to buy." And "I don't understand...

He says, to a forum filled with people using Chinese batteries and BMS electronics. But yeah I wouldn't trust an inverter.

Yes, regarding the air, but foam does not just "move" away. In fact as the poron compresses in any given local area the pressure it applies will increase at that location. That said, the flat plate is how their fixture is presumably designed. I believe this was discussed. The compromise on...

Mech E student here. Can confirm 11 psi is 11 psi. Perhaps we can get a PE to confirm my confirmation. And that your statement about increasing pressure is also correct, but you need to factor in the existing compression limiting expansion as well. So there is a condition where you have a...

That's what I do where possible. I often use anchors that are a bit smaller than the hole to allow a bit of slop, where allowable. Which is almost everything I do since I set the rules for the crap I'm installing anyways. No failures in my industrial environment so far in 10 years I've been...

I agree with building a small insulated box for the equipment. Perhaps a basement room in its entirety. I don't entirely agree with using the vacuum insulated panels though as they eventually leak and then become useless over several years. They're very very useful in certain applications...