12V system

[anujdave23]

Hello ,
I am building EV scooter with 48V battery.
For lights, blinker and horn I am using (48->12V) DC DC Converter delivering max10A.
The system and the vehicle is functioning properly in normal condition.
But, when I keep the headlight(drawing 1.6A) or horn(drwaing 1.5A) switch ON, my main system or drive train is not able to fucntion and start up.
And its not a problem when I switch off the swtiches and run the system again, It is functioning properly.
Can you tell me possible reason or solution for this issue?

 

[E-HP]

Hello ,
I am building EV scooter with 48V battery.
For lights, blinker and horn I am using (48->12V) DC DC Converter delivering max10A.
The system and the vehicle is functioning properly in normal condition.
But, when I keep the headlight(drawing 1.6A) or horn(drwaing 1.5A) switch ON, my main system or drive train is not able to fucntion and start up.
And its not a problem when I switch off the swtiches and run the system again, It is functioning properly.
Can you tell me possible reason or solution for this issue?

How are you providing input voltage to the buck converter.

 

[amberwolf]

I am building EV scooter with 48V battery.
For lights, blinker and horn I am using (48->12V) DC DC Converter delivering max10A.
The system and the vehicle is functioning properly in normal condition.
But, when I keep the headlight(drawing 1.6A) or horn(drwaing 1.5A) switch ON, my main system or drive train is not able to fucntion and start up.
And its not a problem when I switch off the swtiches and run the system again, It is functioning properly.
Can you tell me possible reason or solution for this issue?

If you post a diagram with the specific way you wired the system, for each wire in it including the ones to the items run from the DC-DC, and link to each of the items in use (DC-DC, controller, battery, light, horn, etc) so we can get details of their specs and limitations/etc., we might be able to see any errors in it that could cause the problem.

If it is not a wiring error then two main possibilties are:

--A defective DC-DC that when loaded at it's output is causing some problem at it's input that shuts down your system. (depends on exactly what your system does when the problem occurs; you'd have to provide complete details of that problem to make better guesses).

--A systemwide voltage drop triggered by the extra load of the DC-DC causing battery BMS to shutdown it's output, or controller LVC to shutdown motor operation.

Sometimes adding extra capacitors of sufficient capacitance, or an inductor/choke, just at the input to the DC-DC may help buffer or filter noise created by loading of the DC-DC, if that's the problem. Voltage drop under load might require a better system battery. Other problems would require more info to suggest tests to narrow down causes and provide solutions.