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But the dangerous tables saws were still used to build things by lots of people before 2009 when riving knifes were mandated. I don't see why it's a crime to b

by elago 9y ago

But the dangerous tables saws were still used to build things by lots of people before 2009 when riving knifes were mandated. I don't see why it's a crime to build a battery pack if you aren't working for Tesla. I still don't get how you can bring up mis-wired inverter as anything related to a DIY battery pack. Without using any batteries, I can go take a wire strippers and 2 extension cords, make a male-male 120VAC cable, plug it into the gas generator in my shed and plug it into an outlet in my house when the powers out and shock a lineman. In the country I live in we have building codes that describe how the work must be done. An owner without a license is allowed to perform that work and have it inspected and permitted. Screwdrivers aren't like lightsabers that can only work if you're a jedi (or have a college degree or certification). I disagree with lumping every form of DIY together. Incompetent DIY projects are dangerous therefore all DIY projects are dangerous?

vvanders 9y ago
> Without using any batteries, I can go take a wire strippers and 2 extension cords, make a male-male 120VAC cable, plug it into the gas generator in my shed and plug it into an outlet in my house when the powers out and shock a lineman. Yup, and that's highly illegal because it can kill someone. If you want to do that you're required by code + law to have a mains transfer switch. I don't think anyone is saying you can't play with battery packs, it's just that this guy is a freaking idiot for doing it in his house where any miscalculation can cause a chain reaction that may kill him and his family. It's about orders of magnitude and safety mitigations. Look at blackpowder/low power explosive regulations. You can keep a small quantity in your house to reload/etc. However if you want to store more you need a separate shed + BATF is allowed to show up at your house and inspect it any time. Back when I was involved with amateur rocketry all of the our vendors went through this process. It's a standard thing when you're involved with elements that have a high potential energy and can go wrong if not treated with the right respect.
- fr0sty 9y ago
  > Yup, and that's highly illegal Which part? Powering your house w/out transfer switch (when disconnected to the utility), or actually back-feeding power to the utility? I would be surprised if the former was uniformly illegal across the US, but the latter certainly is.
  - vvanders 9y ago
    NEC requires a proper transfer switch: https://diy.stackexchange.com/questions/22154/are-generator-interlock-kits-permitted-in-residential-applications https://diy.stackexchange.com/questions/22154/are-generator-...

by elago 9y ago

vvanders 9y ago

> Without using any batteries, I can go take a wire strippers and 2 extension cords, make a male-male 120VAC cable, plug it into the gas generator in my shed and plug it into an outlet in my house when the powers out and shock a lineman. Yup, and that's highly illegal because it can kill someone. If you want to do that you're required by code + law to have a mains transfer switch. I don't think anyone is saying you can't play with battery packs, it's just that this guy is a freaking idiot for doing it in his house where any miscalculation can cause a chain reaction that may kill him and his family. It's about orders of magnitude and safety mitigations. Look at blackpowder/low power explosive regulations. You can keep a small quantity in your house to reload/etc. However if you want to store more you need a separate shed + BATF is allowed to show up at your house and inspect it any time. Back when I was involved with amateur rocketry all of the our vendors went through this process. It's a standard thing when you're involved with elements that have a high potential energy and can go wrong if not treated with the right respect.

fr0sty 9y ago
> Yup, and that's highly illegal Which part? Powering your house w/out transfer switch (when disconnected to the utility), or actually back-feeding power to the utility? I would be surprised if the former was uniformly illegal across the US, but the latter certainly is.
- vvanders 9y ago
  NEC requires a proper transfer switch: https://diy.stackexchange.com/questions/22154/are-generator-interlock-kits-permitted-in-residential-applications https://diy.stackexchange.com/questions/22154/are-generator-...