Or just buying a couple of Hobby King Lipos (series of parallel) and saving myself some time. From what I see they cost roughly the same.
The main difference I see between the two is the c-rate or the max currents. The Samsung cells offer 15A output which intuitively would double in parallel while most lipos offer (5AH*25c) 125A! Ok so a huge difference, I’d need a number of parallel cells to keep up. But maybe 125A is overkill, I’m really only interested in finding the minimum output current required for my use case.
Also, “Burst” output is often mentioned. Is this the output while I’m going at full throttle or is it usually only achieved when going up hills or accelerating from a standstill? There is no mention of “burst” or anything like that on the samsung cells so I don’t really know how they’ll handle on an eSkate.
And finally: If I made it well, and without mistakes, is £75 a good deal for the BMS/Cell combo? 6000Mah + long lasting cells, only downside seems to be that it’s limited to 30A possibly.
If you need to ask me a question (about my build plan) before you can answer mine feel free. I’ve only taken an interest in eSkates this weekend so I’m a bit of a noob and my mind is numb from research.
Thank you to Peter Griffin and the Aku Aku mask guy and everyone else who’s in pretty much in every thread.
PS I searched already
Maybe won’t be able to reply to everything tonight.
Current depends on your load. You havnt specified what you want to see from your batteries so far. So its really hard for us to guess. Any single motor setup with some gearing would be alright with 40 or 50A contineuous drain. Top Peak current is refered to when the motor is hungry and wants current to do something. Applicable scenarios in esk8 would be start from stand stil, uphill climbing (moderate distance), and probably the most demanding, start from stand stil uphill.
With that said, we have no Clue what your setup is, what you expect from it, if you can weld cells or what your budget are. Gives us those and we can help further
10s4p (40 cells) has pretty much become the minimum standard for any kind of performance. This is more for power output (voltage x amperes) rather than range. Anything less than this, you’re giving up something. Lipos can get you to the minimum power level for cheaper but there are many tradeoffs.
Chinese hubs like meepo can get a lot out of less power. Not anything like the usual 10s4p or greater builds, but if you’re not ready for the commitment maybe pick up one of the chinese prebuilts instead? And when you get bored or it breaks, expand the budget and come back?
The “burst” isn’t really a helpful spec in any way other than giving you an idea of what the cell is capable of delivering for a very short amount of time. It does not mean that the cell is intended to feed that current even for a short amount of time and it does not mean that the cell won’t take damage when delivering that current. It most probably will affect cell life/damage the cell aso.
(There isn’t a standard for the sc burst or pulse, so you have no idea what the manufacter even means by this rating, ie how it is measured /if it is measured.)
The rated constant discharge current is the maximum of what you should pull from the cell (given that you keep working temperatute within ok limits) if you want to have a somewhat ok cell performance for (a given) x amount of cycles.
By bigger motor do you mean I need the dimensions to be bigger or do I need more torque and power or both? Should I be looking at a >170Kv motor maybe?
That is the correct type of motor, but the kv you need will depend on the battery. Also, I don’t know if that vendor is good. If you get low-quality stuff, you might have little customer service unless you live inside China with that vendor.
maybe pick up one of the chinese prebuilts instead? And when you get bored or it breaks, expand the budget and come back?