openinverter forum

Outlander Dc DC charging a small 12v battery.

I am seeing to much current as 6amp @ 14.4 Volts sense wire is directly on the battery and the battery is full charged and out gassing.
My fix is to use a high current diode, DC-DC output and sense wire on the terminal thou diode to + on battery losing 0.6v.

One advantage is I am running the water pump straight of the DC-DC so it only comes on when charging or driving

What type of 12v battery do you have?

snelly1 wrote: ↑Thu Aug 22, 2024 3:56 pm Outlander Dc DC charging a small 12v battery.

I am seeing to much current as 6amp @ 14.4 Volts sense wire is directly on the battery and the battery is full charged and out gassing.
My fix is to use a high current diode, DC-DC output and sense wire on the terminal thou diode to + on battery losing 0.6v.

One advantage is I am running the water pump straight of the DC-DC so it only comes on when charging or driving

I noticed similar behaviour with DCDC pushing into 14,4V battery. It was one of the 5 DCDCs. Others would charge up to 14V only.
I tried to solve that with some resistors and chokes... didnt test any diodes as i thought this would only increase voltage.
It seems sense wire has wrong resistance,,, In the end i removed that DCDC as it creates too many unknown scernarios to deal with...

the battery is "UK 055 Car Battery - 12V 35Ah - HONDA TOYOTA NISSAN SUZUKI"

i am only running the contactor lights and windscreen wiper with it, have not got power steering, brakes and no electric windows.

The if you use a resistor it would not keep a constant voltage drop as the load changed, I.E. when you turned lights on.

So Diode will all ways drop 0.5-0.7 volts and putting the sense wire on the charge output terminal will make it think is charging at 14.4v and the battery seeing about 13.8 V

my old user name was snelly lost my email mail address so had to make a new account, I EV conversion Grandin Dallas Jeep Base on Peugeot 205 running gear is my project