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2Instructables15,693Views30CommentsIndonesiaJoined March 31st, 2018
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  • Luq1308 commented on Luq1308's instructable Peltier-based Smartphone Cooler6 months ago
    Peltier-based Smartphone Cooler

    Sure a simple heatsink will do the job fine, but where's the fun then? Your concept, the thermoelectric generator type, will also do the job and it's much more practical but my original plan was to make a phone cooler that actually cool down the phone, not just bring it close to the surrounding temperature. Besides, I live in tropical region where the air temp is constant at 30+ degrees, the temp difference between the hot side and the cold side won't be that much. Also, I just finished making the smaller, more practical version and it's so much better!Cheers!

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  • Luq1308's instructable Peltier-based Smartphone Cooler's weekly stats: 6 months ago
    • Peltier-based Smartphone Cooler
      759 views
      8 favorites
      6 comments
  • Luq1308 commented on Luq1308's instructable Peltier-based Smartphone Cooler6 months ago
    Peltier-based Smartphone Cooler

    9V is way too much for my peltier and way too low for my fan. Had to overdrive the fan at 13.5V in order to keep the hot side as cool as possible to maintain the best efficiency. While it's true that peltiers convert 2/3 of the power to heat, I don't have any better, suitable alternative right now with current technology. Honestly, I don't get what you're saying, maybe a little but mostly, no.Would be nice to tell me which Instructables you were referring. You got many Instructables there.

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  • Luq1308 commented on Luq1308's instructable Peltier-based Smartphone Cooler6 months ago
    Peltier-based Smartphone Cooler

    Right on point Josh! Peltier modules can convert electricity to temperature difference and vice versa. In fact, a specially made peltier for generating electricity does exist and known as thermoelectric generator (TEG) as opposed to thermoelectric cooler (TEC)

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  • Listrik L585 585Wh AC DC Portable Power Supply

    One of my friend. He's a battery importer. I have no idea where he got it. Sorry.

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  • Listrik L585 585Wh AC DC Portable Power Supply

    Sure! I watched a lot of his video, especially his videos about lithium battery. Maybe I should give a credit to him..

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  • Luq1308's instructable Listrik L585 585Wh AC DC Portable Power Supply's weekly stats: 1 year ago
    • Listrik L585 585Wh AC DC Portable Power Supply
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      218 favorites
      66 comments
  • Listrik L585 585Wh AC DC Portable Power Supply

    I got mine directly from the manufacturer (Ruideng). Drok is just a rebrand. Anything other than DPH3205 and DPH5005 (both have 5A output) is just a buck module, meaning the output can only be lower than the input. Not very suitable in this case.

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  • Listrik L585 585Wh AC DC Portable Power Supply

    Manufacturer says it has anti-backflow protection so I don't need any diode. DPH3215 and DPH3220 don't exist, only DPH3205 and DPH5005.

    I'm unsure what "attitude" you're referring to. Please let me know.

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  • Listrik L585 585Wh AC DC Portable Power Supply

    You should know that current rating on a wire depends on the quality of the wire. This is the datasheet of the exact same wire I used:http://www.reihsing.com/rh14/old/UploadFiles/20123...First, their 16 AWG wire is rated at 17A, just slightly above 15A. Second, 16 AWG was the biggest available wire size I could buy on the hardware store so I was left with no choice. If I had the choice, I'd definitely choose larger wire to be on the safe side and minimize power loss.-Temperature isn't really a problem. I tested it myself. Everything is still within the limit.

    Thank you for the input. I updated my part list with your recommendation (larger wire) but so far, my power supply is doing great, even at full load.-There's no particular reason. I bought the IMAX B6 Mini quite a long time ago, and that's my only charger that is capable to charge 6S battery with balance function. The maximum power it can deliver is only 60W. I'm not bothered too much about 10 hours charge time. I like slow charging, it's good for my batteries.

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  • Listrik L585 AC DC Portable Power Supply / High Capacity Power Bank / 585Wh Solar Generator

    This is the datasheet of the wire I used:http://www.reihsing.com/rh14/old/UploadFiles/20123...As you can see, I picked the biggest size available (16A AWG) and it's rated at 17A. Just slightly above 15A. I should give more room just to be on the safe side but it was the biggest size available so I was left with no choice.

    I't more than enough, especially for very short chassis wiring. My biggest concern isn't on the wiring though..

    I was unable to find any 6S BMS with balance function locally. I don't have credit card, so I can't buy things from Aliexpress or Banggood. I'm just a poor student, so I have to think hard to keep the cost low.-I tested my cells individually on both capacity and internal resistance. Because they're rejected cells, they haven't used yet and have similar capacity and internal resistance. Of course some cells are defective, or just didn't pass the test. I reject all of those cells. I filtered it, sorted it and so on until I end up with 6 groups that have very similar capacity. It was quite a long process, like 2 months but it worth the effort. My battery pack is balanced. I haven't fully discharge my battery pack so I can't tell you the end voltage of each cell, but it look promising.

    I never thought about that but I think yes, fuses between cells is can be very important. I forgot that but the thing is, from hundreds of videos and instructions about building battery pack I've seen, I don't see anyone use fuses in every series connection, let alone use a fuse when you already have BMS. If I know about it, I'll definitely use it but it's too late. Well, at least I have insulate my groups with multiple layer of thick kapton tape. I think that should be enough.

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  • Listrik L585 AC DC Portable Power Supply / 158,000mAh Power Bank / 585Wh Solar Generator

    Temperature while charging isn't an issue at all. My IMAX B6 mini can only do 60W, that's nothing compared to the 585Wh capacity. The charging time is more than 10 hours, so slow that almost no heat is generated while charging. Temperature while discharging isn't a big issue either. The maximum discharge current is well below 1C (1C = 26A) so not much heat is generated. My battery pack has about 33mOhm internal resistance (tested). Dissipated power is I^2*R. 15*15*0.033 = 7.4W of heat being generated at maximum load. For something that has mass of 3 kilograms, that's negligible. The instrument panel has 3 big circulation holes on the back (hard to see) so I think the cooling is more than enough. Also, I tested my battery pack at high load and the temperature rose to about 45º celsi...

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    Temperature while charging isn't an issue at all. My IMAX B6 mini can only do 60W, that's nothing compared to the 585Wh capacity. The charging time is more than 10 hours, so slow that almost no heat is generated while charging. Temperature while discharging isn't a big issue either. The maximum discharge current is well below 1C (1C = 26A) so not much heat is generated. My battery pack has about 33mOhm internal resistance (tested). Dissipated power is I^2*R. 15*15*0.033 = 7.4W of heat being generated at maximum load. For something that has mass of 3 kilograms, that's negligible. The instrument panel has 3 big circulation holes on the back (hard to see) so I think the cooling is more than enough. Also, I tested my battery pack at high load and the temperature rose to about 45º celsius. Well below 60º maximum working temperature.

    Thanks. Maybe not anytime soon because I'm broke hehe.

    Thank you. I've consider all of the important aspects, including wire gauge. For high current wiring, I used 16 AWG silver stranded wire. 15A is the maximum current I can draw from the circuit because 15A is the maximum current rating of the BMS. If the current went above 15A, the overcurrent protection will trip. The inverter isn't really 500W anyway, only like 300W-400W before the overload protection kick in.-I've done quite a lot of research about lithium battery and I didn't see any article about compensating for cell expansion. I've seen other people stacking their flat lithum cell together just fine, and even RC Li-Po manufacturers stack their cells together so tightly that I had difficulty to take it apart. You could be right, but so far there's no problem with my battery pack.

    I'm open to all critics, as long as you're nice enough. Your input is very important for me. I removed my subjective claim as you wish. I was wrong, yes. I admit it. I fixed it. It should be less confusing now. Once again, thank you for your input. If you have anything to tell me, tell me. I'm just a student, not really an expert. I'll appreciate any input that will improve myself.

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  • Listrik L585 AC DC Portable Power Supply / 158,000mAh Power Bank / 585Wh Solar Generator

    I got the lithium cells from local battery importer here in Indonesia so that's a bit unfortunate for you but as always, you can substitute it with much more common 18650 lithium cells. You can salvage some 18650 cells from old laptop batteries. They're usually still in acceptable condition.

    Sure. My calculation shows that a 18650 cell with similar capacity has better gravimetric energy density compared to this prismatic lithium cell. I prefer it because its form-factor. Also, those cells already have tabs pre-welded there so it's easy to solder them.These prismatic lithium-ion cells have hard shell, not as hard as cylindrical 18650 cell but still not as soft as typical lithium polymer cells. Any kind of lithium battery has the risk to explode, what's matter is how you handle them.

    The seller doesn't ship internationally. I'm just a high school student so I can't do much about it. Sorry.

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  • AC DC Portable Power Supply / 158,000mAh Power Bank / 585Wh Solar Generator

    Then you haven't seen this one haven't you? My first portable power supply with clear case and red 18650 cells. It definitely looks like a bomb lmao.

    Make your dreams come true :-)

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