BatteryBox
While I was camping with my T5 Multivan - used at the one hand as an usual car and at the other hand as a camper van, I had the problem with the 12V power supply for my bus. Since I had just the starter battery, I had two times the situation, that the cooling box and other equipment has consumed too much energy from the starter battery so that I couldn't start the motor. I was forced to find a solution. The main guideline was: it should be as cheap as possible.
In my basement I had an old starter battery with 84Ah capacity, which is suitable for
Integrate it in a 400x300mm Eurobox to be part
And I want to use ist for a "quite" independent "Power-Supply". My expectations are:
- supply the cooling box (in my case an Dometic CF35W) with power for a couple of hours while I'm hiking without consumption power from the starter battery
- don't spent money for the fully integration of a second battery which can be charged via the alternator
- I don't have the expectation, that I
- can be switched off with an main switch
- can be charged by an car battery charger with 230V
- cooling box can be connected
- USB (smartphones) devices can be charged
- a battery pulser is integrated
- while the alternator is running all the devices should be powered by the car electric
- when the alternator is off, all devices should be powered by the second battery
- connect a solar panel to charge the battery box while you're autarkic
- connect a external charger (power booster) to charge the battery box during the alternator is running
The schematic here on GitHub is just an proof of concept. It doesn't fulfill all the electrical requirements regarding safety and established standards. This battery is a self made project and must not be created if you aren't a electrical specialist. Building the battery box is on your own risk.