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I guess I have a problem when the line of demarcation goes from "You have to do it safely" to "We aren't going to let you do it yourself." The NEC definitely exists for good reason. If you look at electrical installations from 60 to 100 years ago, they were just accidents waiting to happen...

I think this is a really valuable video, not so much to bash Chins or Ganfeng, but rather to emphasize that just because it says "solid state" doesn't mean that it is safe. They probably do have some solid state component in the battery, and it definitely had a higher volumetric energy density...

Don't think I'll be ordering. I'm not a fan of connecting things to high power equipment with spring terminals.

You might be thinking of the way lithium metal reacts with water violently to form lithium hydroxide and releases hydrogen gas in the process, which will usually self ignite from the heat of reaction. With a lithium ion battery fire, most of the heat is coming from the flammable electrolyte...

I signed up for the free access to the NFPA codes at https://www.nfpa.org/Codes-and-Standards/All-Codes-and-Standards/Free-access I think the result of these changes will largely depend upon your code enforcement AHJ. The language in article 690 defines the parts of a photovoltaic system and...

Perception is a funny thing. My mom used to always make sure the toaster on the kitchen counter was unplugged if we were leaving the house in the morning, because it "might catch on fire". However, she never gave a second thought to the the pressurized natural gas line in the basement with a...

This is interesting news to me. I hadn't heard of utilities implementing demand based charges on residential customers. I wonder why this was chosen instead of time-of-use rates. The stated goal of both systems is to minimize the amount of generation capacity that has to be installed for peak...

I do have some experience with an LG heat pump dryer. I purchased one last year as part of a long term plan to reduce air leakage of my house. I wanted to get rid of appliances that used conditioned air from inside the house and then dumped it outside. I got rid of my traditional resistance...

Have you looked at how municipal code is written? It usually defines who gets the final say on interpretation. It is never the property owner. Now, you could go fight them in court, but it is an up hill battle. For the original poster's case, the interpretation of what a 'structure' is will...

I was the youngest. I may not have been the favorite child, but I can guarantee I was the favorite son. :sneaky: Or perhaps I just had the problem of over-thinking trivial things. On the other hand, a few years ago I was home at about 8am when I heard a loud THUD and felt the house shudder...

So the question in my mind is how much of the loss from 176 Ah to 155 Ah is just the reduced capacity of using the batteries at a low temperature and how much is permanent degradation from the damaging effects of charging at low temperature. This will be interesting.

Here is a link to the data sheet for the SIND 06 610, since it is the one that looked superior in his video. https://www.trojanbattery.com/pdf/datasheets/SIND_06_610_DS.pdf Couple of things that jump out right away that he didn't talk about. First, the Peukert effect, ie loss of capacity due...

There are insulated boxes, and then there are INSULATED boxes. The answer to your question is calculable if you know the combined square footage of surface area of all sides of your box, the temperature difference you want to maintain, and the R-value of your insulation. This assumes you have...

I'm going to stick up for the Volt a bit here, both in terms of concept and implementation. I've had two of them, a first generation 2012 and a second generation 2017. My daughter now has the 2012. I got the 2017 because I wanted the longer electric range and adaptive cruise control. Where...

At this point it may be a bit redundant, but since I was only able to make this purchase because others shared their experiences, I thought I would add my purchase experience with Jenny at Docan to the thread. I have purchased two batches of 36 EVE 304ah cells from Docan. The first was ordered...

I've been looking forward to this test with interest because I've been considering how to design a solar shed for Midwest winters. Lag in cooling of the thermal mass of the batteries along with the speed of heating during low temperature charging are important for determining how cold I can...

I watched a 'Fully Charged Show' video today that pointed out an interesting contradiction in "cost sharing" that is happening in Great Britain. Admittedly they have far more options for how you pay for power, but my local utility has a similar 'community solar' program that gave me pause for...

Wow, you are a brave soul; asking for error correction immediately after referencing pedantry. The result is replies full of information that is absolutely useless from people such as my self. Gravity - not a force, but rather a warp in space-time caused by mass that results in a bend in the...

The only way to resolve the question is to call your county code enforcement office and ask them. The thing that will matter in the end, is not exactly what the code says, but exactly how they interpret the code.

I found the table below at bruker.com. They make a product called Cuponal, which is copper clad aluminum bar stock. The important bit from this table is the first two columns by M6. So they are recommending 4.5 to 5.5 Nm for optimal connection between two pieces of their bar stock when using M6...

When dealing with vendors, it is important to realize that Grade 'A' or Grade 'B' has no standard definition. The manufacturers sell batteries that make the grade for vehicle use, which does have government mandated standards even in China. The ones that don't meet the requirements of the EV...

Solar energy, as in raw energy emitted by the sun, is probably the least 'green' in terms of the ecology of earth. If the sun were left unchecked, its emissions of highly charged fast moving particles would strip away the atmosphere, and its high energy electromagnetic radiation would break...

I did try to look a Docan's website before I purchased, but didn't really find very helpful. In the U.S., the expectation is that you should be able to go to a website, see a product description and a price, figure out your shipping cost and place an order without human interaction. When...

Here is the section of an EVE LiFePO4 spec sheet dealing with temperature. So, you can discharge the battery cells as low as -35°C (-31°F), but they don't want them stored long term below -20°C (-4°F). An of course they are not supposed to be charged below freezing. It really becomes a...

The old adage: "Good fences make good neighbors"

If we define words arbitrarily, our ability to communicate will be nominal. :)

It sounds like they removed the phrase that section 706 only applies to DC systems greater than 60 volts and replaced it with 'greater than 1kwh', and added the listing requirement, and made it applicable to stationary and mobile installations. That would mean that if you put two Battleborn...

Actually, the word nominal is super frustrating in kind of a funny way. Some of the possible definitions are: existing or being something in name or form only (ie. "He's the nominal governor, but has no real power') relating to a designated or theoretical size that may vary from the actual...

The other interesting data points to look at are the individual cell voltages when the pack reaches its low cut-off point. This will give you an idea of how closely matched in capacity the cells are. Also, in this post I gave results of measuring my battery with different meters that I have...

I'll be the one to ask the potentially dumb question here. It sounds like you are using information from the inverter to decide the state of charge of the batteries. How does the inverter know the state of charge of each battery that is in series? I don't see voltage sense wires going from...

If you are looking for someone who has been consuming alcohol to help you, I'll do my best. So watt hours give you a rough idea of how much energy is in your battery, and a rough idea of how much power your load will consume. Kinda like saying "I bought a 12 pack of brews for my uncle, and he...

Research Gate had a paper from 2017 that is available for download where they shorted a 160ah and an 8ah LiFePO4 battery. https://www.researchgate.net/publication/316171277_Temperature_Overcharge_and_Short-Circuit_Studies_of_Batteries_used_in_Electric_Vehicles It looks like the current...

I found this article interesting: https://www.sciencedirect.com/science/article/pii/S037877531730839X They shorted out NCM and NCA cells at using different external resistances (unfortunately they did not test any LFP cells). On the most direct shorts, the current chart looked like this...

It is also important to consider the power output at NOPT (Normal Operating Temperature) vs. STC (Standard Test Conditions). I was looking at some Panasonic HIT panels that appeared to be twice as expensive as the cheapest ones, but they only lost .3% per degree Celsius temperature rise, as...

This evening, I ran across this video on the Texas power failures. It is the best thing I've found so far that keeps to a technical explanation and has some interesting charts and graphs.

When I read the datasheet here: If you don't read the intermingled information about screw size, I think it becomes clear that they are talking about the battery pole itself. Since "anti torsion" literally means "resist twisting", it could be written as: Separating the screw thread...

I'm not sure which iCharger model you have looked at. I own the iCharger X8. I can't give you any good comparison with other equipment. However, I did shop around and chose the iCharger because it is sort-of a Swiss army knife of buck / boost charging. It has profiles for many different...

@Sillyputty , Thanks for sharing your misadventure in battery repair, and I'm glad the damage and cleanup wasn't too bad. If I'm ever in this situation, I would probably give it a go, but definitely have it on the list of work that must be done outside, where the smoking remains can be kicked...

Just watched the review video here. For obvious reason, I think the discussion of the video belongs in this section. I checked out the Ganfeng cell data sheet, and noticed that in their safety testing, there is no puncture test nor any guarantee that it can be punctured and not combust. It...

So, I watched the entire second video. Near the beginning, he does acknowledge that lead acid batteries require careful operation and regular maintenance if one is going to get the maximum rated life from them. Then he also acknowledges that lithium batteries can endure much longer spans...

Thanks for the well written and detailed evaluation, and the photos of the modifications you made.

I agree this is the best thing to check first. Pictures of your battery might help people make other suggestions. I thought of a couple of things based on mistakes I've seen other people make. First, make sure your batteries sit level with the top of the battery cells even, so that the bus...

I am dumbfounded by the historical attitudes toward home insulation. It is evident that either that generation was so hardy that cold, drafty houses were no big deal, or evidence that the relative cost of energy was really cheap. I purchased an old 700 sq. ft. home that was in terrible shape...

They were probably safety sandals...:rolleyes: I'm thinking the cells are lithium polymer or NMC based on the voltage range in the datasheet. Definitely have an exothermic reaction that releases oxygen to make them burn that fast. Edit: I just took another look at the data sheet, and right at...

Hey Will, I think you might have misunderstood what they meant by the whole "Drill baby, drill!" thing.

If the solar panels are the Mega200 Max panels on Rich Solar's website, they have all of the temperature coefficients in the manual for the solar panels. I attached the manual from their website. A clip of the temperature data is:

If you want some research, there is a paper here called "Overcharge Cycling Effect on the Surface Layers and Crystalline Structure of LiFePO4". From near the end of the paper: And from the conclusion section: So if you got to 7 volts, there is no hope for long term use of the cells. Also...

Thanks for sharing the chart ArthurEld. However, I think it has the 30x3 and 30x5 amperage values switched with one another on the DC side.

Before going into the math on temperature coefficients for you solar panels, and deciding on possible arrangements for them, I wanted to point out the output current limitation on your charge controller. Your charge controller output to the battery is limited to a maximum of 100A. So if you...

People will always assume they know more about any given situation than they actually do. I know this is the case because I assume it to be true.:unsure: