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  1. dermot

    Bulk charging via digital DC-DC boost Minghe BST-900W

    I've used one on test only. I wanted to use a 12V solar panel to trickle charge a 16S LiFePO4 pack - it works but you need a very low impedance supply. I had to put 50,000mfd capacitors across the panel to keep it stable. It works better in the car for charging a folding bike, but again low...
  2. dermot

    X5304 v BBS02

    My daily commute is 4 miles (round trip) and I generally use around 0.85AH at 52V. There are a couple of small hills, but I'm not really hitting the throttle hard. If I do the same trip throttle (but not maximum speed) only, I probably use 2.5AH. This bike is getting rather knackered now...
  3. dermot

    X5304 v BBS02

    I've been riding around for quite a few years now on my old 26" bike with an X5304 in the front. With my riding style and terrain, I average about 12Whr/mile on 52.8 V (16s 11AH LifePO4) with an ancient Crystalyte 35A controller. I'm thinking of shifting to a BBS02 750W - am I likely to see...
  4. dermot

    Wiring diag for Signalab 20S LiFePO4

    OK, thanks - that makes sense, looking at the device itself and matches up with a 12S one. cheers, Dermot
  5. dermot

    Wiring diag for Signalab 20S LiFePO4

    I have an unused Signalab 20S LiFePO4 BMS labelled E321748 and SH-S 94V-0 I've done a lot of searches here and elsewhere and can find pretty much everything *except* the one bit of information I need: How to wire the thing up to the cells and charger/controller. I have an older one with a...
  6. dermot

    Building A Lithium Battery For Use With Inverter.

    Lead acid car batteries are the cheapest but looking at your power requirements, you'd be pushing your luck to get 1250W from a 12V powered inverter, that would require something like 125A at 12V DC to feed it. 24V would be a bit better, but I'd go for 48. Huge cables and volt drop are the...
  7. dermot

    Balancing time

    These little balancing boards can bypass 1.7A - good when characterising old used A123 cells. 5 cells down 115 to go....
  8. dermot

    Solar / low voltage charging

    Quite some time back, I commented on a thread about a DC-DC converter I was designing to charge up to 72V from a 12V DC input to charge my folder while it was in the car. Well, it sort of worked, but not reliably or efficiently enough to want to post it here. Recently, I bought several of...
  9. dermot

    Turnigy wattmeter repair

    Just doing some capacity matching/measurement on a bigger A123 pack and have popped my Turnigy 130A power meter - I'd forgotten that it had a limit of 60V - it has worked at 66V for a long time, but it hit 72V today for an extended period and the display flickered and there was a 'pop' sound and...
  10. dermot

    Charging batteries in the car

    A 20series 6parallel A123 M1 pack, so 72V at 1 to 1.5 Amp is good for a fast-trickle charge. Won't know until I test, but I see no reason why a pair of these with a pair of combiner diodes (in fact, half a 25A 600V bridge rec I have kicking around) wouldn't double that. Only when the engine is...
  11. dermot

    Charging batteries in the car

    For a while now, I've been looking for solutions to charge my folder batteries while the bike is in the car. I've built a couple of devices, but found them rather inefficient due to difficulties manually winding transformers. Also found a couple of low power DC/DC converters on ebay which...
  12. dermot

    Do people even try reading or searching anymore?

    I've just spent a fruitless few minutes with both the native and google forum search functions, but still can't find any help: I have an X-lyte 36/48 35A controller that works in pedal-first mode and I want instant start. This board has a sticker saying H3 under the board and on the top a...
  13. dermot

    Sensorless controller choices

    A question for the group mind, as I've still not resolved my sensorless controller problem: http://endless-sphere.com/forums/viewtopic.php?f=2&t=48391 So what is the sensorless controller (and supplier - I'm in the UK) of choice these days? I'm wanting something in the range of 72V max volts...
  14. dermot

    How to remove a Sunrace freewheel from an X-Lyte 5303?

    And that fits the SunRace very nicely, thanks for the pointer! Reassembled without the chunk of metal, so now all I have to do is sort out a spacer. Dermot
  15. dermot

    How to remove a Sunrace freewheel from an X-Lyte 5303?

    Thanks for the advice, guys! I'd searched the Halfords site, but not spotted that - local store has one in stock, so off down there now. This wheel is unused; what happened is that I'd not noticed a scrap of metal had fallen between the largest chainring and the motor body when I assembled it...
  16. dermot

    How to remove a Sunrace freewheel from an X-Lyte 5303?

    I need to remove this SunRace 5 speed freewheel from a 5303, but I can't seem to find information on the appropriate tool - all I have is a standard chainwhip and the usual hand tools. It may not be clear in the image, but it is stamped with SunRace Freewheel B0525 Do I need a specialist tool...
  17. dermot

    Sensorless Crystalyte

    Now that Spring is here and Summer is on the way (hah!), thought I'd pick up on a project started and then deferred last year - now I've forgotten where I'd got to. The one on the left (72V-45A) works fine (and interestingly, LVC cutoff is actually 41.5V rather the the 55V specified) just fine...
  18. dermot

    The All-Singing, All-Dancing Sphere Health Thread

    I'm not at all convinced by the statements about RF and microwave - millions of people have an MRI scan every year which involves magnetic fields up to 30,000 Gauss and a peak RF exposure of 20KW (though the average is only a couple of Watts per Kg of body weight). If RF and magnetic field...
  19. dermot

    A Conversation With a Scammer

    http://baita.mugu.co.uk/ When I receive such a call, I put on my most formal voice and intone: "Have you accepted Jesus Christ as your personal saviour?" If the answer is no, I say that I don't do business with godless hell-bound unbelievers. If yes, that I can't do business with them as all...
  20. dermot

    Any Other Pastafarians Here?

    I too have been touched by his Noodly Appendage... http://en.wikipedia.org/wiki/Flying_Spaghetti_Monster dermot
  21. dermot

    Nuts for 5303/4 motors

    Shipping nuts from Canada or the US will probably cost far more that the nuts themselves! I really just need to know what size/thread to look for. I bought both motors from Crystalyte Europe, the front one a couple of years back, the rear one a couple of months back. dermot
  22. dermot

    Nuts for 5303/4 motors

    I have both 5304 front and 5303 rear motors - the '03 came without nuts and I've just lost one from the front motor that I use daily. I'd previously ordered a couple of spares from Crystalyte Europe, but I've just tried to fit one and they are the wrong thread. Anyone know what thread/size...
  23. dermot

    Controller advice needed.

    OK, I have two Crystalyte controllers for which I need a couple of pointers: One (bought on here recently, but is a couple of years old) is a 72V/50A one - works fine, but LVC is 55V - Ideally, I'd like to drop the LVC to 48V or even a little less since I am using 20series LiFePO4 not LiPo and...
  24. dermot

    Magic Pie on Murdoch Mysteries?

    Just watching a recent episode of Murdoch Mysteries - Who Killed The Electric Carriage - and saw what appeared to be a Magic Pie in the rear wheel of a three wheeler. Although billed as being capable of over 50mph, it looked to be doing maybe 30mph peak. Still not bad for a single hub motor...
  25. dermot

    Seal of approval for Crystalyte controllers

    Looks like at least one member of the avian race has given the seal of approval for Crystalyte controllers.
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