48/100 battery protect

DIY
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1

I have installed 48/100 battery protect in my system, after this point in the circuit I have a voltage drop through a DC-DC convertor that drops the voltage from 48 - 24vdc to operate my 24v lights and alarm system. During the commissioning stage I am having issues with the battery protect internal fuse, once I have created a load through on the lights it is causing the battery protect to fault / alarm and short the internal fuse.

Any suggestions has to why a voltage change to a lower voltage would be causing this internal fuse damage?

2

Perhaps share a wiring diagram or a picture of the set up or how it is wired.
Fuse blowing usually means either over current or a short. (A short can also be a reverse polarity)

3

sorry have no pictures at the moment but will be word the layout

  • (power in - lynx smart shunt - power out) to
  • 50mm cable to battery protect in - 50mm cable from battery protect out to
  • Main circuit breaker to 48v - 24v DC/DC convertor
  • load is x 2 24vdc lights
4

Is the dc to dc converter working ok?

5

There is no fuse on batteryProtects.

But you need to install a fuse on the input cable.

BPs are strictly unidirectional, a reverse current will damage them, and most likely (at least for what i have seen) it becomes conductive all the time with no way of switching it off.