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  1. M

    Li-Ion battery: Too much voltage?

    Well, I think everything's been answered. Thanks everyone, for all the help.
  2. M

    Li-Ion battery: Too much voltage?

    I was going to use an off the shelf capacity meter that can be connected in series b/t the battery and load. I know that they're not perfectly accurate, but I'm hoping that one will give me a ballpark idea of remaining charge. Perhaps these things are of little value, though.
  3. M

    Li-Ion battery: Too much voltage?

    Out of curiosity, what is your current draw, battery AH, and run time?
  4. M

    Li-Ion battery: Too much voltage?

    I should have proofread my post. I was calculating based on the 50 AH mentioned in a previous post, not based on the 20ah battery. I'll take your word that it's a dangerous practice to run batteries in parallel, but why? An EE once told me to hook them in parallel a day or two before use so...
  5. M

    Li-Ion battery: Too much voltage?

    Good observation. I think full power would be more like 15A. Maybe lead acid would be better. I have nothing against lead acid per se, I do have something against lifting a 60lb battery in and out of my car. This battery...
  6. M

    Li-Ion battery: Too much voltage?

    Thanks for the replies. First off, I'll say that I understand that all of this might be impractical. I'm looking at all this in an effort to power a canoe or kayak with a 30 amp (max) motor. I'm interested in going this route so I don't have to pick up a 60lb battery and set it in the boat...
  7. M

    Li-Ion battery: Too much voltage?

    I have a Minn Kota trolling motor. I'd thought that Li-Ion batteries were too expensive, but I see that I can make them out of individual cells for a reasonable cost. The problem is, I think that they put out too much voltage. My trolling motor is straight forward, but I've made a pulse width...
  8. M

    Deep Cycle battery and trolling motor question

    thanks, I'll check it out.
  9. M

    Deep Cycle battery and trolling motor question

    Hey, Part 1 When running a deep cycle battery, I know that current draw can be used to calculate run time as a factor of Amp Hours of a battery. I also know that batteries should only be drained down to about 50%. So, if I'm running a trolling motor, should I calculate run time assuming that I...
  10. M

    100V motor on a pump?

    That explains it! It's make by Iwaki, a Japanese company. Can I run it safely and unattended on American 120 mains voltage?
  11. M

    100V motor on a pump?

    Looking at a pump, it has a 4-pin connector. It's rated for 100V, 50/60 Hz, .15/.17 A, 5W. Considering the frequency rating, it seems like this is an AC pump. Considering that the voltage is "100" rather than "115" or "120", and considering the 4-pin connector, it seems like this is a DC...
  12. M

    Back up power for small load, extended run time

    thanks
  13. M

    Back up power for small load, extended run time

    I see that 420 is roughly half of 1,000, but I wonder why it would last for 1/2 hr? If I'm drawing 50 watts per hour, and a 12V 35AH battery gives me 420 AH, wouldn't I then be able to run for 8.4 hrs? Given the losses I listed, I will assume that I need 1471 WH. With a 12V battery, this...
  14. M

    Back up power for small load, extended run time

    Even though the inverter is overill, I'm going with a larger one yet. For $20 more, I can get a pure sine wave inverter. Below is my math, and I'm hoping someone can tell me if I'm making any mistakes. At any one time, the max load that will be drawn is 50 watts. I would like the system to...
  15. M

    Back up power for small load, extended run time

    thanks, I appreciate it.
  16. M

    Back up power for small load, extended run time

    Well, now we're back to the inverter, transfer switch, and battery. It looks inexpensive enough. I'll have to poke around at it some more to see if it's something that I can do myself, or if I'll need to hire an electrician. Would this be an appropriate inverter...
  17. M

    Back up power for small load, extended run time

    The simplest solution seems to get a computer UPS. With computers, such UPS systems have run times rated at about two hours, give or take. With my low power requirements, it seems that such a device could run for 24 hrs. Others have frowned upon this idea, saying that such UPS devices are not...
  18. M

    Back up power for small load, extended run time

    I can get a 500 watt inverter for about $40. I already have a 35 Ah deep-cycle battery, in pretty good shape. To do a quick and dirty conversion, it seems like 50 watts AC being drawn in an hour, divided by 120 V, equals 0.417 Ah. Assuming that I can drain the battery down half way, I can get...
  19. M

    Back up power for small load, extended run time

    I need to run several devices (a heater and a few pumps) for an aquarium, more-or-less constantly, in the event of a power failure. The total consumption of these devices, is about 50 watts per hour. I'd like to implement a backup system that, ideally, will run on external AGM batteries, so...
  20. M

    Lamp: Will it burn my house down and kill me?

    As for replacement bulbs, they are available, but cost about as much as the original unit that I linked to. Other bulbs are half the price. As for LED UV arrays, these will not work. "UV light" is a term applied to a range of wavelengths, the longer of which do not have germicidal activity...
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