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[boo]

Hi guys i have a project in wait and looking forward to connecting it all up i will have a 48v battery pack but would like the battery wired up so that i can use my existing 24v charger can anyone suggest a schematic for me thanks guys

i assume you use 4 X12V battery. Connect them series to form 48V pack. you can consider this configuration. Fuses are for protection in case the switch got stuck.

[okmate]

Hi guys i have a project in wait and looking forward to connecting it all up i will have a 48v battery pack but would like the battery wired up so that i can use my existing 24v charger can anyone suggest a schematic for me thanks guys

i assume you use 4 X12V battery. Connect them series to form 48V pack. you can consider this configuration. Fuses are for protection in case the switch got stuck.

thanks mate thats great could you tell me what amp the fuses should be also what type off switch should i use is that a double pole rocker switch

[boo]

Current rating for the fuses will be around 50% more than your charger rated current and less than 1C rating of your battery. Switch is a double pole double throw, and can be a rocker or toggle switch, preferably a 3 position ( right or left for battery selection and Off at the center). Sorry I don't have the exact part numbers.

[HypnoToad]

It's a bit of a long shot but would anyone happen to have the schematic to Ezee 36v brushless motor controllers?

I managed to damage a few tracks on the PCB, and it would be far easier with some schematics.

Also, how easy would it be to change or disable the upper voltage limit for the battery?

This seems to be the main chip, and there are 5 holes in a row next to it which could be a connection to a programmer?

[RichiePA]

Wow what a useful thread cant believe I've overlooked this for so long.

I've already posted this elsewhere but it is probably of some use here, this is a sort of battery circuit schematic for anyone who wants to build a lipo battery pack with Methods HVC/LVC parallel boards.

battery circuit inc hvc lvc boards.pdf

(112.98 KiB) Downloaded 83 times

The .pdf shows the best detail if you need to zoom in on any part of the image.

[lc_60]

acid wrote:I build a 100V/100A switch with a precharger:





The FETs are IRFB4110 from an old controller, 3 in parallel and the forth one to precharge the controller over a 100 ohm resistor.

edit:
This is the final result. It charges the controller with 1A for half a second. That should be enough time to connect the battery.
For 48V I would replace the 4.7u capacitor with 2.2u.
The z-diodes protect the FETs from blowing and the voltage range is 29-100V now.

I'm building an e-bike and I'd like to put a precharger circuit. Your circuit is very good and I'm triyng to make one alike but in your diagram I can't see where is the way out of the B-.
You have a way in where is V1 84V but then the circuit closes around only interrupted in the key switch (j1 Key=A), but I can't see the way out. Can you indicate where it is? I guess it could be near the 6 but I'm not sure.
Thank you

[lc_60]

I've already been answered in the topic Battery Connection + On/Off Switch,

Tanks.

[steveo]

Can anyone post a schematic for the newest generation of infinion pcb controllers?

Thank you

[billyjones454]

Looking for a schematic for a thermometer with alarm. I don't want/care for a display. Just an alarm that can be mounted discretely that will go off at a certain temperature.

Also a simple LVC that my throttle would be routed through. Again, no display required.

Thanks!

[amberwolf]

Looking for a schematic for a thermometer with alarm.

http://www.google.com/images?q=schemati ... with+alarm
some have displays some don't, don't knwo anyting about any of htem.

Another option could be as simple as an resistive thermal sensor in a voltage divider driving base of transistor that pulls donw ground on a piezo buzzer; you'd have to work out values for things.

See Methods HVC/LVC thereads for the schematics to the LVC/throttle control.

[lava]

I am considering building a 48V A123 LiFePO4 pack instead of buying one; can someone direct me to a schematic of a typical arrangement with BMS? I looked at quite a few pages of this thread but didn't find anything. I'm an electrical engineer so I am pretty sure I could pull it off without much trouble, but I would like to see a schematic to really get a sense of the cost savings vs time investment.

[amberwolf]

Take a look around at the various battery repair and battery build threads; there are some that show a few different ways you could do ti.

[.kit]

Thanks for all the help so far from the forum on my a2b metro.

Now I have to figure out what to do with that 6 pin barrel connector going to the second battery location where I plan to put my new battery.

Should I run a new set of wires for the new battery or try to interface to that plug?

anyone know the pin out on that plug or the recommended alternative option for the a2b metro?

[middriveebike]

Anyone tried to create a push button for throttle that can use together with the hall sensor twist throttle for ebike?
Basically, I want to use the twist throttle when starting to move and use the push button for max speed after accelerated.
I was trying to do it with some transistors and the result isnt good.

[fechter]

Anyone tried to create a push button for throttle that can use together with the hall sensor twist throttle for ebike?

The easiest way would be to find a push button that's double throw (like most microswitches). Run the common contact to the controller input and the normally closed contact to the throttle so it behaves normally when the button isn't pressed. The normally open contact can then go to the 5v or to a potentiometer to make it adjustable. Note: some controllers will fault if you tie the throttle signal directly to the 5v line and will need the pot.
EDIT: potentiometer can be about anything, but I would suggest 10K. from 1K to 100K should work.

Pushbutton Throttle.jpg (21.16 KiB) Viewed 362 times

[dnmun]

if your throttle has a max voltage of 4.7V i bet you could use two fixed resistors in series to convert the 5V power to a 4.7V signal. use a 5.9k ohm resistor above and a 93.1k resistor and the voltage should be 4.7 on the terminal between them that you would connect to the switch.

[middriveebike]

wow. That is smart. I was thinking too much about current and transistors that I forgot about there are easier solutions.
Thanks.

[dnmun]

using a multiturn trimpot like that is easiest way to find the exact max voltage. you want one with a high enuff resistance that it doesn't drain a ton of current from the 5V power line so i just used the 100k total. but the signal line will use some current also but i figured the input impedance on the signal line was in the megaohm range but the trimpot will give you a good way to compensate for it. you could even set it up using a trimpot and then measure the resistance from the wiper to each end and use fixed resistors of the same value or ratio with total resistance close to it. sometimes the bournes trimpots can be a little more expensive than leaded 1/4W resistor or two.

[middriveebike]

I found a button. I think it will do.
I have some 100k trimpot in my collection. It should do the trick.
Is there any reason why using 5V would not work?

[dnmun]

the controller has a default shut down if the throttle voltage is the same as the 5V supply voltage. it is there to protect against a throttle signal wire shorted to the 5V power which would lead to unexpected and uncontrolled WOT.

if you use an ebrake switch then you could use a rocker switch for the cruise controller and then if you had to do an emergency stop the ebrake switch would shut off the controller until you reset the throttle switch.

[middriveebike]

I see. Seems like it is best to do some experiment with the trimpot and see what is the max voltage I can use.
Thanks for the explanation.

[fechter]

Right, some controllers have this safety feature and some do not. Alternately you could use a resistor in series with the 5v but you would need to experiment to find the right value. If you're lucky, straight 5v would work.

[middriveebike]

Here is my ebike's full schematic.
I placed the battery and controller inside the truck so that it is much more difficult to jump start my bike.
The ignition is connected to the main power through a relay, which is controlled by an FM transmitter key chain.
The throttle is controlled by the twist throttle or non self locking cruise button as suggested by fecher.