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  1. E

    Alternative Energy Charge Bank

    I see. Well the usb ports i looked at can supply up to 750mA. The converter 3A. So 1.5 A looks like the max draw since there are two ports. So is a 2 A breaker too high? In theory, current draw will never exceed 1.5A
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    Alternative Energy Charge Bank

    Why 2A ? So it never diacharges above 0.5C?
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    Alternative Energy Charge Bank

    Final Draft. Buck Converter wins.
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    Alternative Energy Charge Bank

    Id like to keep it small. I will look into a buck converter though. That was the point of the voltage divider though, to not waste so much energy to heat. Though I guess the resistors would do the same thing
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    Alternative Energy Charge Bank

    I will try it this way
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    Alternative Energy Charge Bank

    7805 5V Regulator is what I'm using. Datasheet says its max current output is 1.5A. So that's as much current as the usb ports will get. (Two ports wired in parelell, so at max draw each port should get 750 mA) I'll use a salvaged heatsink. Other than eliminating the voltage divider, everything...
  7. E

    Alternative Energy Charge Bank

    It wont cause too much stress on the vr? seems like a big drop
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    Alternative Energy Charge Bank

    USB charging output for cell phone/ tablet
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    Alternative Energy Charge Bank

    update
  10. E

    Alternative Energy Charge Bank

    Its a voltage divider. Ive never wired one but this is how its supposed to go I guess. I used (Vout=Vin*r2/r1+r2)
  11. E

    Alternative Energy Charge Bank

    Here is the design. There are some redundancies in here. Probably a little over engineered. Let me know what you think
  12. E

    Need to find an alternator

    I will look into a BLDC motor. As soon as I finish the design I will post it in projects. Critism is more than welcome.
  13. E

    Need to find an alternator

    I better start looking into making my own alternator then haha
  14. E

    Need to find an alternator

    My mistake i was confused with another battery i looked at. https://www.ebay.com/p/12v-4-5ah-lead-acid-sla-battery-for-apc-ups-ub1245/1104511125?iid=140917767576&trdt=0&rdtsrc=vi This is my battery. Is 0.1C a recommended charge rate for this cell? I realize 1C is a little intense
  15. E

    Need to find an alternator

    I need to use it to charge a 12v 4.5Ah gel battery. I think most auto alternators would over charge a cell like mine
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    Need to find an alternator

    A wind turbine is exactly what im going for. The project is a solar/wind charging bank. Ive got my battery: 12v 4.5Ah secondary cell May need more than one i guess. My solar panel: 50w 12vdc output with controller. Just need the wind generator now. If i knew a good software id draw you a...
  17. E

    Need to find an alternator

    I'm dreaming up a new project. I need to find a 50W alternator. It needs to put out 12 vdc at 4.5A. I cant find one. I'm leery of making my own because ive never done it before. If anyone can help out id appreciate it
  18. E

    This might be a fun disscussion :)

    Id take that bet. They do say modulate or "remodulate that" a lot haha
  19. E

    This might be a fun disscussion :)

    I feel the same way. It seems like energy would be created like a power plant. A force pushing a wheel or turbine to create AC current. Then being rectified to DC to be used for the ships systems. I thought up a design in my head last night and it sounds a lot like what we're all talking about...
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    This might be a fun disscussion :)

    Ok guys, time to nerd out... Any Star Trek fans out there? Yes? Well this might be a fun thing to talk about. I am fascinated by space and ill find myself thinking about how space craft in movies actually work. If this thread wanders a bit, so be it. Heres the question: In Star Trek, the ships...
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