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  1. Sunder

    280-320vdc to 220+AC?

    Hey guys, Long shot here, but I have been wanting to try to build an inverter from my PHEV to 220+vac. I've had a look around to see how I can step this up to 380vdc, so I can then convert it to a mains voltage, but either we're talking about things in the milliamp range, or ... actually that'...
  2. Sunder

    BIFRC Spot Welder Uprated Voltage.

    Hi All, Right before Covid, I bought a spot welder identical to this: https://www.reddit.com/r/18650masterrace/comments/evvs44/bifrc_spot_welder_from_aliexpressebay/ But as I was bogged down with work, and working from home under covid lockdown, I never had a chance to assemble it or use it...
  3. Sunder

    The downside of more electric bikes

    I didn't think there would be one. More parts, greater general acceptance, used bikes to buy and modify, etc. At worst, I thought if they were mostly home made, one or two incidents would cause police to start cracking down on the obvious duct tape bikes. But since Covid, almost all increases...
  4. Sunder

    UK will be electric bike capital of the world!

    https://www.dailymail.co.uk/news/article-8565997/Doctors-prescribe-bicycles-2billion-drive-tackle-obesity.html No doubt there will be some screaming from the motorists, about riders being tax dodgers, a menace to pedestrians, and causing pollution by holding up kilometers of cars behind them...
  5. Sunder

    Any way to convert a rim brake fork to disc brake?

    I bought a RockShox Paragon RL "Disc brake" compatible fork from eBay. Everything on the website suggests there is only one model. Even when I type in the serial number, it shows that it's rim brake only, then the disc brake mount type, minimum and maximum rotor size. No wonder it's confusing...
  6. Sunder

    Putting more weight on the front

    This is going to be a strange question, but I am using this time In social distancing to improving my eBike for when things get back to normal. My problem is that my bike has way too much weight on the back and not enough weight on the front. I've never been a pro rider, but my eBike handles...
  7. Sunder

    Phaserunner - Tips on sensorless tuning?

    Hi All, So a couple weeks ago, shortly after the heavy rain in Sydney, my Phaserunner started acting up. You know that comment on thr Phaserunner page along the lines of "It's fully potted and waterproof. The connectors, not so much". Well, I found out the hard way it's true. The Phaserunner...
  8. Sunder

    The joy of causing despair and confusion

    This is my bike: It's nothing special. Built on a cheap Orbea frame, with a mix of cheap Unbranded, low end, and high end Shimano gear. Oh. And Q100H, oil cooled, pumped by a Phaserunner pushing 1100W. I never designed it to be stealthy. Only to avoid being a theft target, and police asking...
  9. Sunder

    USB-PD Charger

    Alright, this is nothing that impressive... Yet. But this is my first run of a USB-PD charger for my eBike: The tiny device hot glued to the wall is what negotiates 20v at the highest available current the charger is willing to give. The big device below is... Actually, it's a 60A DC to DC...
  10. Sunder

    What makes a good commuter?

    Hey guys, Trying to keep it short while explaining my needs. But I just got a new job that's 18km away. (About 11 miles). The ride is from 60m above sea level, to basically sea level. (And of course, return) Steepest hill is about 9%, but only very short. (80ish meters?). I put my old eBike...
  11. Sunder

    I bit the bullet - Grid Tie Backup Solar Coming Soon

    I've just ordered a 5.5kw Solar install for my house. 16 x 345W LG Neon 2 Panels, 16 Panel Optimisers (I live in a very green area, so lots of trees) Solar Edge 5kw Backup Inverter (Built in Battery Charger/Inverter) I will probably put 2-3kwh of batteries under the house, to store excess...
  12. Sunder

    Single Use Inrush Limiting Resistor

    Hey all, Pretty simple question, but considering the voltages concerned... One I want to be pretty sure of. I will probably be connecting the battery to the controller for the first time soon. As the battery will be 168v, and the controller is a 400A model, I expect there to be rather large...
  13. Sunder

    21kw+ QS273 won't outrun a 250cc?

    Some of you guys might know that I'm collecting parts for a Ninja conversion. The build is based on a 150Kg Ninja 250R frame, which should drop to about 130kg once I strip all the petrol burning gear, and add back the weight of batteries and controller, etc. To be honest, I did very little...
  14. Sunder

    Weight Distribution on Bikes

    Hey all, I am trying to decide how to distribute the weight of the battery on a bike. In the past, 2-5kg on an eBike wasn't an issue, but now I'm talking about 50kg, and I think it will make a difference. The rules of thumb I've heard are: 1. Lower on the bike is more stable. 2. More weight...
  15. Sunder

    Suppliers for QS 273 motor?

    Anyone know where I can get this from? There's a few on Aliexpress, but not in the winding/magnet size I want. I've emailed CNQSMotor.com, who are apparently the retail subsidiary of QS Motor, the manufacturer, and each time, I have to send multiple emails, after waiting a few days for a...
  16. Sunder

    Series BMS Confusion

    Hi Everyone. I suspect this question should have an easy answer to someone who understands it, and plenty of confusion from people who don't. It involves diodes, bad design, and magic smoke. The story is that I'm using 3 x 20S BMS instead of 1 x 60S BMS. This is a LTO pack, so 162V max, 144V...
  17. Sunder

    144v or 72v for motorcycle?

    Almost 6 months ago, I started a project to convert a Ninja 250R to a Ninja 230H (The H is for Hectowatt :D ). Back then, I built the batteries to 3 x 48v for a 144v system. I figure with a 100A sustainable current with higher peaks, going 72V wouldn't be that smart. The parts are available...
  18. Sunder

    Spotweld prismatics? Or Fold and Clamp?

    Hey guys, I've finally got some time to put together my huge LTO batteries. Soldering large prismatics is always a challenge, because they sink way too much heat. So I got a large 80W with a big tip... No go. Hitting it with a blow torch, like you would with a really large piece of copper or...
  19. Sunder

    ODB2 Controller, or Canbus based Speedo?

    Hi Guys, I am thinking about building a QS Motor 273 based motorcycle. This would have to be 100% road legal. Thankfully, there are very few engineering specifications that need to be observed under law, but one of them is that you need a speedo accurate to within 10%. There are a few hall...
  20. Sunder

    My 38kw, 138v, 3.8kwh LTO Battery

    Nothing to report yet, but grand adventures await. Planning on connecting 57 or 60 of these batteries in series, for an electric motorscooter. I am intending to build 3 x 46v packs to be joined by solid copper bars. Makes them easier to work with both weight (Each cell is 900g, so the...
  21. Sunder

    Shenzhen Foxell - Dodgy Practices

    Hi Guys, I ordered some samples of LTO batteries through Aliexpress from Shenzhen Foxell Technologies. The cells were 25Ah. They waited 5 days before messaging me that the cells were out of stock, and would I take some larger 28Ah cells instead for the same price? 99% of the time, you would...
  22. Sunder

    Overcoming Zener Knee for BMS

    Hi All, I briefly brought up the idea before of using a Zener Diode as a crude BMS, when a proper BMS can't be found. I'm still hoping to build a 55S LTO battery, but finding any BMS that is programmable for LTO is rare, and up to 55S, as hens teeth. I was told before that low voltage Zeners...
  23. Sunder

    What if there was no gas/petrol?

    Read this article last night: http://www.dailymail.co.uk/news/article-5614947/Fears-petrol-prices-Australia-rise-airstrikes-Syria.html TL:DR unlike most countries, Australia doesn't keep a strategic petrol reserve. It said within 2-3 weeks Australia would be out of petrol... But I fill up...
  24. Sunder

    Help me reinforce this DC to DC step up.

    So I melted a 10A rated step up converter with just 2.5A, so now I've bought a 40A version: Absolutely Buckley's hope this will handle 40A. I knew that when buying it, but it's worse than I thought. I had intended to upgrade the heat sink on this, but as you can see on the side view, the...
  25. Sunder

    Cheap 14.7v step up to 29.4v? ~ 500w

    Hi All, I'm trying to figure out how to get 14.7v to 29.4v reasonably cheaply. My car has a 1500w traction battery to 14.7v step down, which I'd like to use to charge a 3kwh off-grid holiday home battery. There's currently 600w of solar panels here, so typically takes 2 sunny days to fully...
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