Geneticallymodified said:
The plan is for 2 long ish range (maybe 10-20miles per battery pack) but as long range as possible
At a guess, it's going to take around 10wh/mile or maybe less, to go on flat ground, no headwinds, etc, at up to 15mph or so. So not a huge battery pack to do that, perhaps 300wh (46v8Ah) (to allow for pack aging, occasional headwinds, etc) to get you 20 miles on that. 200wh (36v5Ah) would be right on the edge of the ability.
But...it'll have to be bigger to handle more power like for hills, etc. and still get the same range.
If you're thinking multiple packs, perhaps carried in the trailer when not in use, that may work, but it can be easier on the packs to simply have bigger ones or parallel smaller ones.
Fast is really not important, ideally 15.5 mph will be more than enough for us I believe. But a good firm torque as hills are more than likely but again it doesnt need to be fast. Long term I would hope to attach a lightweight trailer to both so again high torque is more important
I don't think the 120w motor will survive that on a scooter, especially upped to 250w+. On a bicycle where you're doing half the work or more pedalling, and it's just helping you some, it might.
Depending on the hills, and the weight, you're probably going to need up to several times that power, since the motor must do *all* the work.
You'd also want to be sure it's geared to the right speed, so it isn't running at a high load at a low motor speed. If you have to crawl up the hills vs the speed it's geared for, the motor will overheat.
If you didn't need hill climbing power, you could get away with less power (possibly a lot less). You'd have to walk the scooters up hills so they don't overheat, in this case.
You'd just need enough power to keep you at 15.5mph with no winds. (if you need to keep moving against headwinds, then you need however much more power it takes to go as fast as your speed plus the headwind speed).
Weather, will be most weather conditions up to light rain.
Pretty easy to weatherproof stuff for then. Keep in mind that the wheels will splash stuff up and any gaps or cracks will let water in, so you'll want to seal what you can against that, and maybe put drain holes in the lowest corners of the battery box, etc, to let the water that does get in drain out.
So I was going to mod a razor rx200 for the daughter as she can already ride it comfortably but it does pull abit as it's still standard throttle (planning to change it to 250w 36v variable speed) and something like a viron 36v 800w (or something like that). Both 36v so we can share battery packs
I weigh about 65kg without a back pack. And the daughter cant be more than 25-30.kg max
Over all weight I need the daughters scooter to be lighter than mine. Like maybe 12-15kg max for the rx200 and the larger, maybe 20-40kg total laden weight?
At a guess, a scooter that will do what you want with batteries for the range you want may be 25kg or more, depending on the kind of batteries you use and the size of motor you end up having to use. Her battery can be smaller (or the same size pack would last longer), since she weighs less, so her scooter will weigh less with less batteries in it.
Trailer...would guess 10-20kg for a trailer, depending on type; then whatever you're going to carry in it on top of that.
You want to at least guesstimate your total weights that each motor has to push, to get an idea how much power it will take to push that up a particular hill (slope) at a fast enough speed to not be damaging to the motor under that load.
The power you have to be able to use determines the controller and motor, and also the batteyr size, not only for it's capacity and range, but for the battery's ability to provide that power without much voltage sag or heating.
So yeah ideally there will be paths and tracks on our adventures but planning for some dirt tracks and stuff a little off road ability will be good
That's probably going to take yet more power, because you'll likely want fatter knobby tires for that, and they dont' roll as well on the street. Depends on the specific conditions you have to go thru, you might be able to use the regular tires. I'd recommend trying out what you've got on the conditions you expect to encounter and see how well it handles it. If it can't (tires sinking into the surface, bogging down, etc), that's when you have to decide if you can just skip those conditions or if you have to build specifically for them.