Hoge spanning

[petelake]

Hey,

I have a Li-Ion battery from my old Zucchetti robotic lawnmower.
Nominal voltage 25.2 V
Charging voltage 29.3 V +/- 0.1 V

The Ardumower requires 24 V.

When I measure the voltage of the charged battery, I measure: 28.6 V !!!!

Can I just connect it to the PCB 1.3 on P43?
Is this voltage not too high?

We have a DC-DC step-down controller LM2596S on the PCB to create 9V for the Arduino DUE. But, are there no other components at risk with that 28.6 V? Or should I, also here, incorporate a DC-DC step-down controller LM2596 (I still have it with me, see photo) and limit the output voltage to 24 V?
Is the current or charging then affected?

thanks in advance
Peter from Bruges

 

[bernard]

Hi Pete.

the voltage of the charged battery, I measure: 28.6 V !!!!

It's perfecly normal.
Adjust the DC/DC ( without the 9V Jumper JP1) to have 9V or gently higher on output when battery is full .
Simply verify that the 5V and 3.3V are stable when battery is near 25V.
I use Paranello and Denna Li Ion pack and have the same result and it's work perfectly.
In My case :
Battery at 27.2V i have 9.2V , 4.9V and 3.2V on the Board and all component works perfectly.

Don't forget a Main Switch between the battery and the P43 PCB and shunt or connect an emergency switch at P49.

By.