Quick background primary - I'm planning to build a small box with some race and circuitry to cut rotten power to a load (laptop, inverter, mini-fridge, etc) once the battery gets low and re-energize power when the saloon is running again.
To achieve this, I need to know what the operating voltage range is on a typical gasoline car within roughly 0.1v - because I don't want it to cut off if while the engine is ideling...but I don't want to drain the battery true uttermost it can't start the engine. I found on my car that if the loads (heated seat, headlights, machine, radio) cuts off halogen about 11.8v there is decent power to crank the engine over when the battery rebounds to around 12.2v but if it fails to start within about 2 seconds of cranking it needs a charge/jump.
I'm thinking because there would be a load that 11.8-12.0v would beryllium the low cutoff and 12.6-12.8v would be a good re-energize point...but I'm mixed up the electrical system may drop to 11.8v if it's ideling (~600rpm) for an extended time with a heavy load...I've plumbed this occuring on my own car running a laptop
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