Ok, maybe I confused things with the fridge, the internal electrics I have are only a few internal LED lights and a 12V car computer.
I have Eriks calculator, the LEDs I want to use are 20mA, first I will test it with single LEDs then if it all works get this circular bar graph
https://www.sparkfun.com/products/11492
Ah which reminds me, I dont need all 20 positions, only 16, so 8 on the first and 8 on the second, that might complicate things a little?
So 3914a LEDs 1-8 should be 11.9V to 50%, LEDs 9 and 10 should be two steps greater than 50%.
3914b LEDs 11-18 should be 50% to 12.72V with LEDs 19 and 20 two steps higher.
The battery status is only for testing before I head off or if I have been in a field for a while to see if I should turn my internal lights on or light the candles, the battery will not have a high load, no fridge!
Can anyone tell me if my is circuit correct? and how to figure out the requirement for the resistor values?
Thanks
Gary