Endless Sphere

Hi goatman, today I returned to this thread and I must say it is unbelievable how far can one misunderstandig go... Your problem is simple. You totally misunderstood and misrepresented the data in datasheet. You have no idea what it is about and for what. Those datasheets are useful only if You unde...

I am sorry to inform You that You got it totally wrong. Please read some battery life related threads to get the basics right first.

Wh is calculated Ah x Voltage. Real life Ah would be little lower value, let us say 3,3Ah. 3,3x13=42,9Ah x 25,2V = 1081Wh. How much current does it consume during dive or what is the wattage of the motor? This is important before making cell choice.

Try this:
viewtopic.php?t=66169

There are few installing 20kW controller and 120A BMS for low power scooter

Reading the thread made me think this is going to be high power one...

No effort will help with the obvious - improper cells for this job... So much money and effort and so short will it last...

Placing the batteries outside UPS housing is a good idea (for any type batteries). Electronics inside UPS constantly warms up one side of the battery...

BMS will loose its function if charge/load paralelled. The diodes would work. The point is charge port can only block charging and load port can only block discharging. BMS with common charge/discharge port would be best solution.

8,5Ah is capacity. BMS is rated for current. Chose the BMS according to how many amps are You going to draw from Your battery.

Battery plus goes directly to charger and load. You only connect B- (battery minus), C- (charger minus) and P- (power-load minus) to the board. BMS is getting plus from the balance wires. They should be chcecked twice and connected last.

If the battery is frozen, it will take some time to warm up to its core. Because You don´t have temperature sensor inside the battery, the easiest way to sort this out is to delay the charging after the temperature inside the chamber reaches "warm enough". The delay should be longer if the initial t...

Either fuse each cell or don´t bother at all... It is there to prevent parallel cells discharge to damaged (shorted) cell in the group.

This battery is definitely underrated for use in 1000W system. What controller are You going to use? How many amps would it draw?
Systems with 1000W DD are often set up to 30A. If Your battery should live any longer use it at 10-15A max.

I understand... I heard that there are different versions of sabvoton controllers...
Does this one have variable regen?

What does the bench test reveal? Have You used another controller?

Hi Tumich,
what conversion rate do You use for EUR price calculation? (Would be really nice to have prices in both USD/EUR in Your firs post...)

I would clamp it with some piece of wood... If any good maybe change to aluminum piece later... Or clamp it between two water cooled heatsinks - the best option
Don´t forget heatsink compound...

Today I have received EC8 connectors with housings, rated for 180A continuous it looks like great candidate to upgrade XT-90. It also accepts thick cables up to 7mm diameter.

I can confirm the package arrived OK, thank You Merlin!

Merlin, did You get my PM? I am becoming a bit nervous, it is 2 weeks now...

Hi, I would like to have 30ml please... Is it on stock?

Yes, there are separate wires soldered parallel to + and - (not visible on photo). I will add a connector (XT60) to connect it to capacitors outside the housing. This way the wires could be short but there will be no problem with disassembling.

Would like to add some info about the controller I modified. Last year (2016) I was beating the controller all the time, and with its power my riding style changed and I was often riding "motocross" style... And it still works fine! Recently I am modifying next one for my new e-bike, and this time I...

fellow, Your mosfet suggestion is great, I even did not know such transistor existed. The only drawback is its price, but the parameters are superb.