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  • Post in thread: New NEC code makes it impossible for DIY systems to be compliant

    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...
  • Post in thread: Will's Review of Chins "Solid State?" Battery (Ganfeng LiEnergy Cell)

    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...
  • Post in thread: I’m Selling DIY Kits for my Solar Clothes Dryer. Only $19.99 + Shipping.

    Don't think I'll be ordering. I'm not a fan of connecting things to high power equipment with spring terminals.
  • Post in thread: Will's Review of Chins "Solid State?" Battery (Ganfeng LiEnergy Cell)

    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...
  • Post in thread: New NEC code makes it impossible for DIY systems to be compliant

    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...
  • Post in thread: Lithium Batteries (LiFePo4) - how safe are they ? - (wife getting paranoid)

    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...
  • Post in thread: Ive had solar for a year and now the utility company charges a demand fee... not cool.

    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...
  • Post in thread: Ive had solar for a year and now the utility company charges a demand fee... not cool.

    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...
  • Post in thread: Ground mount panels and property setback

    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...
  • Post in thread: Lithium Batteries (LiFePo4) - how safe are they ? - (wife getting paranoid)

    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...
  • Post in thread: Cold Temp LiFePO4 Charging Test

    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.
  • Post in thread: This guy claims lead acid is superior to Lithium Iron Phosphate in solar applications

    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...
  • Post in thread: Dealing with -30° F Winters.

    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...
  • Post in thread: Hybrid Plug-In Electric Car - vs - Total Electric Car

    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...
  • Post in thread: Our NEW GO-TO LiFePO4 vendor...09.20.21

    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...
  • Post in thread: Cold Temp LiFePO4 Charging Test

    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...
  • Post in thread: Colorado utility company locks people out of their thermostats

    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...
  • Post in thread: Our NEW GO-TO LiFePO4 vendor...09.20.21

    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...
  • Post in thread: Ground mount panels and property setback

    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.
  • Post in thread: Xuba Electronics: DEAL - 280AH LiFePo4 cells. Purchase & Review

    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...
  • Post in thread: How to tell if EVE cells are A or B, and does it really matter?

    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...
  • Post in thread: How green is solar energy?

    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...
  • Post in thread: Our NEW GO-TO LiFePO4 vendor...09.20.21

    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...
  • Post in thread: Dealing with -30° F Winters.

    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...
  • Post in thread: Ground mount panels and property setback

    The old adage: "Good fences make good neighbors"
  • Post in thread: EVE280 high C rates anyone?

    If we define words arbitrarily, our ability to communicate will be nominal. :)
  • Post in thread: New NEC code makes it impossible for DIY systems to be compliant

    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...
  • Post in thread: EVE280 high C rates anyone?

    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...
  • Post in thread: EVE LF280N Capacity from Docan Power

    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...
  • Post in thread: Half of my battery bank is not discharging

    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...
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