Connecting batterys in series

radrss32

1 µW
Joined
Dec 18, 2017
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4
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Monterey
Hi and thanx for taking time to help me. I made a series connecter for these battery's I purchased. The controller is a 48v 1000 generic Chinese model. The battery's in series put out 60v. I feel stupid for even thinking that it could handle 60v so when i plugged them into the controller it popped immediately. I just want to be sure that's why sparked and burnt out the xt90 connecter that connected to the controller before I buy another one. If it is can anyone suggest a controller that will handle 60v and also will my motor handle it as well being a 48v 1000w motor?. Thanx PS No none of the exposed wire touched.View attachment 2View attachment 1
 

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The spark was probably the controller capacitors pulling a burst of high current as soon as it was plugged. Usually enough to leave a burn mark on the connector, but not burning it off. If the connector was destroyed, this is suggesting a short. If it has a burn mark but still complete and connecting fine, the connector is OK and most likely, your controller too.

48v controllers are generally built with components that would handle 60v. You’d have to open it to know, and it might show the damage if any.

Your total 16s RC lipo are supplying more than 60v though. When they are fully charged at 4.2v per cell, your voltage is 67.2 and many 48v controllers are not built to take that much. What you need to check are capacitor and mosfet ratings. Cheap to replace, and pretty easy if you are able to do small solder.

The motor will handle 60v just fine.
 
I should have added:

Your knowledge of RC lipo chemistry is important, because they can burn down your house. So please, if you are not familiar with them, take the time to read the threads about lipo managing safety peocedures.
 
Looks like from the photos you put 4 4s packs in series for 16s. Each pack charges to 16.8V for a total of 67.2V. That's too much voltage for most 48V controllers which have 63V caps in them. And some 48V controllers will have mosfets rated for 67V or less, but that's usually not a problem, as I run 100.8V on fets and caps only rated for 100V and haven't had a problem in 5+ years and 25K miles. You need to check the voltage ratings on the caps and fets in your controller if you want to run 16s lipo. Otherwise you should run 15s or less. 12s lipo works very good with a 48V controller. And to get rid of the spark when you connect the battery to the controller, you need a pre-charge resistor. This works good for 36-100+ volts.
precharge.jpg
 
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