m@Robertson
Well-Known Member
- Region
- USA
Unless your name is Grandpa, in which case its snowing and uphill in both directions.Plan your trip properly. Your way out, make it all uphill, so it's all downhill on the way home.
Unless your name is Grandpa, in which case its snowing and uphill in both directions.Plan your trip properly. Your way out, make it all uphill, so it's all downhill on the way home.
It is if the battery will fit (be sure of that) and you feel a need to go further.Hello, new guy here, as well as e-biking. I Installed a motor kit without a battery and bought what I thought was going to be a spare for my trike. This 48v 14ah battery is handling my riding of both bike paths as well as the hike/bike trails that are dry and wide enough for me to get down. I want to get a spare now, is it worth paying in weight/money to go 48v 20ah? Thanks to any replies.
Not necessarily. I have 20ah packs that use 18650's and they aren't particularly large. Size is very dependent on what cells you use. Samsung 25R's in a pack make it capable of handling very strong output from a big-drawing controller. But the cells are not energy-dense so you need more of them to make up a pack. I've got one of those. Energy density versus energy storage used to be a classic tradeoff. You get one or the other but not both. Something like a Panasonic GA is a cheap cell that stores a fair bit more than a 25R, but its not good for high output so you seen them in packs that have BMS' with typically only a 30a rating. Samsung 30Q's were a prized compromise that gave you both, but ran hot. I have a 31ah pack with 30Q's in my 2wd hub commuter, and it fits into the bike's triangle.At 20ah, I’d assume that battery would use 21700 cells.
https://bicyclemotorworks.com is where I go to buy my packs, or have them custom made (I don't think he does custom work anymore). These packs are made to order (even the production models in the store) in the USA. I strongly recommend going up to 52v. Its almost the same peak voltage, compatible with 48v systems and gives you more usable volts. The power increase is negligible and only in effect for a short distance. Here again 52v makes it easier for you to charge to 80%. A 48v system is 54.6v at 100% charge. A 52v system charged to 80% is 55.4v, which is still more voltage than a 48v system so you have more range but can still do a limited charge to preserve your investment for longer.Thanks, I have room to go bigger, at least to 20ah. If funds are available I'll look at 52v.