[frodus]

Originally Posted by Spider-man

i didn't notice that they were not onboard. Does the elcon or Delta-q charger handle both 110 and 220?

not saying that it's a necessity, but it would be nice. How long has yours lasted?

well, have only used it on a couple of test packs I built, but I know quite a few people that have em and they've been running well for a while.

They have 72V and 96V versions. I might upgrade to the one with built in DC-DC converter and sell the one I've got.

[Spider-man]

well, if you decide to replace yours, let me know. I might be looking for one by then.

a dc/dc converter built in would be a very shiny feature. nice indeed...

How do you monitor your soc? I have been looking into this and it seems to be the one thing that eludes people the most. Some use just voltage but I have heard that that is guesswork at best in some cases.

What's your take?

[frodus]

My BMS measures my SOC. www.elithion.com It's a Lithiunmate Pro. A little overkill for a bike, but pretty snazzy.

There are some that measure current to get an idea of the state of charge, not sure how well they work, haven't heard much.

[Spider-man]

wow. you built your own bms? is that difficult to do?

I have honestly thought about building the controller and other components myself. I'm just not sure how hard it'd be...

[frodus]

no, the BMS I'm using = my BMS. I didn't design it, but I work for them.

It'd be a lot of work to build a controller with decent performance. I say get it going first, then you can experiment, and sell the old controller if you finish and are happy with the one you design.

[Spider-man]

What motor would you suggest using? just out of curiosity...

[Spider-man]

ok. New project.

I have come across some mopeds from the 70's (i think) "honda express" they have 1 cylinder engines in them and I plan to convert them. (or just 1)

like before, I still have that ac motor. I think this thing is light weight enough to work and I am moving to a place with the speed limit of 30-40 mph. (small town in Texas) what do you guys think?

I really would like this motor to work with the mopeds I have. (since I am limited on money and such) i did some research and I think i can do the build for between 200 and 300 dollars. Think it is worth shooting for?

again: I am new at this so any and all advice is appreciated!

[frodus]

Light enough to work using an extension cord, yeah, but the issue is, how do you convert DC to something useable for that motor, and still have the ability to control the speed.

what kind of AC motor is it? Some are induction, but some are series wound DC motors that run on AC or DC. If it's an ac induction motor, you'll find it hard to convert. I'd suggest finding a DC motor.

Look at surpluscenter.com under electrical. They have lots of stuff that'd fit that bike.

I think $300 is a bit on the low side, especially with controller/batteries/charger.

[Spider-man]

well, i didn't include the price of the batteries. I have those already. I am planning to use an inverter to change it from dc to ac current. from there, I should just be able to treat it like any ac motor sitting in a shop running off of 120v. the controller I found is cheap because it is for almost that application exactly. it looks like it's for a shop and has a pot right on the faceplate of it. I will post the link in a bit