Comments by "David H" (@DavidHalko) on "Pumping Water Without Blades - Magnetic Pumps - Future of Propulsion?" video.

  1. Plasma canons?
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  2. A/C is more efficient at lower voltages. As the power for transmission rises, D/C becomes more efficient… but we are talking massive amounts of power, power to cross continents, nothing that is applicable in a home.
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  3. “…to provide real thrust?” Using solar panels & nuclear… perhaps outer space is a good use case, for interplanetary travel, like Mars, Venus, or elsewhere?
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  4.  @jameshisself9324  - “local dc only” If you are going to use 12v accessories, like automobile accessories, sure… run 12v cigarette lighters & 12v barrel jacks around the house, all over the place. I did this for awhile, making sure all of my security cameras, routers, some local lighting, and Ethernet switches were all 12v. I have to warn you… changing lead acid batteries got really old, after over a decade. Moving to 48v DC (which i am trying now) is no panacea. In some ways, it is better, with 0 gauge wire available, but expensive, and enough current can be transmitted from batteries to turn over an HVAC compressor @240v A/C. In some ways, it is the worst of all worlds, with breakers & fuses being expensive, needing an adapter to step down from 48v to 12v for common uses, then using adapters to step down from 12v to 5v for common USB equipment. New Ethernet routers can use 5v, new security cameras can use 5v… but lighting is still 12v minimum, while new LED bulbs are 120v a/c without electronics circuit to step down the voltage, and new 120v A/C outlets include 2x USB power outlets. There are efficiency losses at every conversion point, and cheap equipment is notoriously inefficient (and noisy with EMF emissions.) Can you get refrigerators that operate on 12v DC? Sure, portable, but they are not very energy efficient, the 120v A/C models are better, 240v better for larger installations. If you are looking for going off-grid reliably, investigate propane for heating, cooking, instant on hot water… then D/C becomes easier. Once hydrogen becomes more mainstream, it looks like a far superior solution than batteries for off-grid living. Use solar to create hydrogen, store hydrogen in a tank (big battery), convert H2 to electricity through fuel cell (preferably, scrapped from a car) or generator (immediately available) as needed, burn H2 in a furnace or on demand water heater or for cooking as needed. Since H2 is not mainstream, I have used natural gas to limit my exposure to the electrical grid (in ~25 years, I only lost natural gas once, when an excavator hit a pipe down the street from my house, but lost the electrical grid countless times… multiple times a year.) Most wild fares are anthropogenic, when crazies & whackos are not setting fires, high tension power lines are likely the culprit (ie likely cause in Hawaii island burning to the ground.) I guess it really depends on what your needs are and what you are trying to accomplish. 120v A/C is convenient, local D/C can be hard when you are trying to use your energy wisely with batteries. 12v is definitely easier, with the availability of automotive solutions, but wire is super expensive, and you better put your battery system in the center of your house to reduce runs to D/C outlets on short runs to interior walls.
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