Quote: Originally Posted by robiewp
I don't necessarily think it isn't bad. Why would you want to avoid a relay when the car will deal with things for you?
does this help understanding?
drawing not to scale.
Yes I understand.(I think)but the tank battery needs to be charged and the carputer needs current in the milliseconds the relay changes.And where do you put the ITPS?
The second battery cannot deliver to the ITPS,because then the carputer will only see 10,5 volt and the car battery cannot deliver direct to the puter
because then it will see 13,5 -14,2 volt when the car is driving.
So the car's battery must deliver to a ITPS when driving and direct to the puter when idle and heavy consumption,the second must deliver direct to the puter but must get 13,5 volt from the car via a resistor for charging
Right