Hi Kim! Great question… I’ve heard some ebike companies and shops guestimate that 180 lbs is a good cutoff when jumping from 350 to 500 or 750 watts (750 is the highest allowable in the US). I’m sure you could get away with a 350 just fine, especially if you pedal along a little to help it get started each time and ride mostly on flats. Here’s a video interview I did with an individual of similar weight who was riding a 350 watt motor for over two years and using a throttle with higher powered 48 volt batteries… you can hear some grinding when the bike starts and I believe this is based on accelerated wear and tear. I hope this helps and welcome you to share what you choose and how it works down the line. I personally appreciate the compact size and efficiency (and lower price) of 350 watt motors but most people would recommend that you aim for 500+ watt in this case.
Lastly, regarding the spot welder. I actually prefer to use the kind like you said, with the two arms that lift up and provide equal pressure at each weld. The kind with two long welding cables like this welder has both options which is nice, especially for if you need to reach to the middle of a pack to make a repair or if you missed a weld. I mostly use the short rigid arms though and just weld one row at a time before adding more cells – that way I can reach all the cells with the short arms.
trying to decide on an e-bike for a 15 mile, hilly commute. I’m a heavier rider. tested haibike with mid drive (loved it), and specialized turbo S (also loved it). It seems the mid drive does better on hills, which kill me. there also seems to be a big difference in price on the 20mph systems and the 28mph systems. for a heavier rider, is it worth the extra cash for the 28mph system?
China has experienced an explosive growth of sales of non-assisted e-bikes including scooter type, with annual sales jumping from 56,000 units in 1998 to over 21 million in 2008, and reaching an estimated fleet of 120 million e-bikes in early 2010. This boom was triggered by Chinese local governments’ efforts to restrict motorcycles in city centers to avoid traffic disruption and accidents. By late 2009 motorcycles are banned or restricted in over ninety major Chinese cities. Users began replacing traditional bicycles and motorcycles and e-bike became an alternative to commuting by car. Nevertheless, road safety concerns continue as around 2,500 e-bike related deaths were registered in 2007. By late 2009 ten cities had also banned or imposed restrictions on e-bikes on the same grounds as motorcycles. Among these cities were Guangzhou, Shenzhen, Changsha, Foshan, Changzhou, and Dongguang.
Pedego Electric Bikes toll-free at (888) 870-9754 from 8 a.m. to 5 p.m. PT, email [email protected], or online at www.pedegoelectricbikes.com and click on “Voluntary Battery Recall” for more information.
Karl at electric-fatbike.com is the Bafang mid drive guru, and even though the BBSHD only maxes out at a slightly higher amperage (30A vs the 25A on the smaller BBS02), the extra copper mass in the BBSHD stator means that at 52V X 30A = 1560W of power, the BBSHD barely gets warm, because it is larger and also sheds heat better. Even if used at the same watts as the BBS02, the stator of the BBSHD is 66% wider, so it will definitely make more torque.
Regarding you question, if I understand you correctly, it seems that your 18650 lithium battery will be smaller than the old NiCad battery, so you have extra room in the battery box that needs to be filled, correct? My recommendation is to use some type of fairly rigid foam to fill the space. It adds almost no weight and it also helps cushion the battery pack.
With a budget in mind, here is a 36V charger (output 42V, exactly what a 36V li-ion pack needs) that I have used and found to be a good budget charger. It’s not super fast, at only 2A, but for just $20 shipped, it’s a great deal. You might have to wait about 3 weeks for it arrive from China though. http://www.aliexpress.com/item/100-240VAC-42VDC-2-0A-Lithium-LiPo-Battery-Charger-E-Bike-charger-suitable-for-10S-36V/559929087.html
A solid all-around mid-drive electric bike kit with shift sensing, pedal assist and throttle override offering 500 watts of nominal power output. Two battery size options, available in downtube or rear rack styles, optional Race Face performance……
Some individuals have lost considerable amounts of weight by using an electric bike. By making the biking terrain less of an issue, people who wouldn’t otherwise consider biking can use the electric assistance when needed and otherwise pedal as they are able. This means people of lower fitness levels or who haven’t cycled in many years can start enjoying the many health benefits E-bikes have to offer. 
Today, China is the world’s leading producer of e-bikes. According to the data of the China Bicycle Association, a government-chartered industry group, in 2004 China’s manufacturers sold 7.5 million e-bikes nationwide, which was almost twice the year 2003 sales; domestic sales reached 10 million in 2005, and 16 to 18 million in 2006.
A very affordable 13S BMS that I like is this 30A version, though https://en.wikipedia.org/wiki/Electric_bikes can take a few weeks or even a month to arrive since it’s coming all the way from China. http://www.aliexpress.com/item/13-lithium-battery-protection-board-48v-lithium-battery-BMS-30A-continuous-60A-peak-discharge/1741121963.html
Court, great site you have here. I will tell you want i think i want but realize i don’t really know what i am talking about: i am looking for the best bike i can get. i want speed, endurance, great on hills, smooth ride and easy gear change, light weight (but not if it is in exchange for a lesser battery), max battery (48v and 17/18ah, and max watts) and anything else you can think of. i am a little confused on the different systems, but want the best of all worlds (of course) but realize that there will be compramise. maybe you can tell me the best balance of all that i am looking for as i am not price sensitive. What do you think of the Stromer ST2? any other bikes i should look at? c
Be warned: some less-than-honest vendors try to pass off nickel plated steel for the pure stuff. They often get away with it because it’s nearly impossible to distinguish between to the two with the naked eye. I wrote a whole article on some methods I developed for testing nickel strip to make sure you get what you paid for. Check it out here.
Electric Bikes Are Now Legal on Pennsylvania Roadways! Breaking News… According to the Bicycle Access Council of PA in their November 2014 News and Digest, Electric-Assist bicycles are now legal on Pennsylvania roadways as part of Act 154. “Electric-Assist bicycles are now legal on Pennsylvania roadways as part of Act 154. In a convoluted way since first introduced in 2010, a last minute amendment was introduced by Representative Kevin Schreiber (D-95) with…
A 48 volt 20-Ah pack contains 960 watt hours and once you get close to 1000 watt hours you are getting serious commuting range which most e-bike manufacturers promise but do not deliver…think 30 miles.
Hi Om, most electric bike kits that I’ve reviewed don’t offer regeneration and those that do are incredibly inefficient (like ~20%) so you’re losing much more energy than you capture. It’s a neat feature for helping you slow down when descending big hills and it creates a nice feeling to think that you’re getting a charge but I would not set out to generate electricity by pedaling unless you want to simulate hills and use your bicycle for rigorous exercise. If that is your interest then check out the BionX kits which all offer regen, you can even buy them preinstalled on bikes from OHM and others.