Recent content by AnthonyC

A new 72V controller's likely to need a new display because the old 48V display's probably limited by 60V components. If the bike has space for both new and old batteries then the 72V can be a booster as JackFlorey said, easier than providing the full current for the bike. The bike rides as...

Someone should mention that regular DMM's typically have a voltage accuracy of +/- 0.5% i.e.at 80V nearly half a volt either way.

How about spiral grooves or ridges on the rotor bell? Skin effect against the hub shell drags a fluid from one side of the motor to the other where it re-circulates mainly through the windings. Axial grooves in the hub shell might increase the effect.

83 / 94 * 4.2 = 3.7 My bad, I assumed you'd be using Li-ion when actually I know nothing.

I've no racing experience but it sounds as though rider endurance (for fewer stops) and higher power (for speed) are the main factors in a win (assuming reliability). Why so much emphasis on efficiency when your voltages suggest you're only using half your battery capacity?

Could the battery pack be reconfigured to 47V so as to ease the kV constraints on your motor? 100% throttle might be optimal but how much does efficiency vary with throttle setting x kV? (The Grin simulator does simulation sets.) How will the motor be cooled and how much power will that take...

I came across these projects linked below a while back, there is something special about wolves and they've inspired some very dedicated work. If you're not yet steeped in Arduino what about moving to a higher level with python instead? The devt environment needs less setting up than for...

That's such exemplary work, the firmware too, thanks for sharing. :bigthumb:

OP didn't mention a BMS for the smaller pack, that would leave it vulnerable to damage. To recap, there's no easy way to control the current sharing whether connected directly in parallel or using diodes, or with BMSs if they simply cut off at excessive current. So both batteries have to...

You've not absorbed #3. I've listed one below and there are others. OP: I get a bit confused when everything is diagonal Me, I enjoy watching cycling, but even in a senior race I'd put myself and others at risk. We all have limitations, I can see it can be risky and that I don't have the...

No, it's when a builder begins who hasn't learnt enough. You're trying hard but you're repeating your questions several times and you're not absorbing answers. We enjoy pushing boundaries and we all wish for you to succeed but unfortunately someone has to say this very clearly :( Battery...

Some 'bents I cannot ride but... have you actually tried a Streetmachine with USS? It's stable to around 50mph and my wobble speed is well under 2mph, it's good in sidewinds, on cobbles, gravel and fist-sized stony tracks. What evils await me? The Greenmachine is another, it's pitched as a...

On a basic comparison these EVE C40 look very good value. Compared to 2kWh of tabbed Molicel P42A they'd take up roughly 50% more space and an extra 2.5kg, at only half the price. With low discharge rate and high capacity they look ideal for a VM, unless you paid over 100 Euro / kg saved for a...

Hey lowrider13, how's it been going, got any updates?

Bear in mind that the chemical energy in a cell is very roughly ten times the capacity and doesn't need air to burn. While you're assembling the groups a 14s6p pack will have about 750Wh x 10 to burn off in a few minutes, that's a 75kW untamable blaze if you're unlucky. Now count the posts...