The bad news:
The deal on the 4 x 100Ah battery did not went trough.
The good news? I made it home
Ok, here is the temperal setup of my trunk.
It is ridiculus messy...
Normally the trunk is empty.
The finished batteriebank will be placed more in the back of the trunk.
There they will be hold better in place in a wooden box with plexi cover to visually have a checkwindow. And over that, there will be a nice strap, so it will never move.
Right now, this is good enough for testing.
I ran today to work (40 minutes) and back to home (40 minutes).
During this trip, i used the coolant and oil heater only until the coolant hit 50degrees Celcius (normally i use it until 70, but i wasnt shure about the capacity). In the way to work, light was used (because it was dark). To the way home, only the smalles position of the lights where used.
Today i only used 1 75AH batterie.
The second one needed to be desulfated.
Now they are both charged and parallel installed.
(dont laugh with the beautiful positive batterie pole isolator
)
This is how much electricity i used up to charge the one battery and the starting batterie:
So, how much Ah did i use today?
Efficiency of the charger: 90%.
Efficiency of the batterie: 95%.
Overall efficiency: 85,5%
Energy used: 0,5kWh.
Energy put in the batterie: 500Wh x 0,855 = 427Wh = 35,6Ah
So it is close to asume that i need around 0,5Ah every minute.
Now i can calculate how much minutes i have every week.
(40min + 40min) x 5 x 0,5 = 200Ah
200Ah usable, so only discharging to 40% left = 333,33Ah.
I now have 2 x 75Ah, next week i pick up an 220Ah one.
Total capacity = 370Ah.
That is verry good!
No need for extra capacity, but i might buy an aditional 75Ah if i bump into it and if the price is good. :P
The maximum capacity my charger can handle is 450Ah.