Battery with solar vs dual battery

[mudski]

if someone is driving everyday then the crank battery is getting charged by the alternator.. with out depleting to dangerous levels ?

although I am still working on my setup , so I could end up like one of those ideling up to charge the second battery or end up with a flat crank battery

Putting constant drain on the battery say via a fridge wont be good for it. Having an auxilary battery and wired up so your cranking battery is for only that, cranking, is the best way. The cheapest way to set up dual batts is via a solenoid, like the Redarc Sbi12. This will work good but as you stsrt to rely on the aux battery more a dc-dc charger is a better choice. Plus with most of the dc-dc chargers you can hook up solar to them to so when your parked for a bit the battery will get charge as they have built in regs. You can still hook up solar with a solenoid but the panels need a regulator. Hopefully ET or Cuppa will jump in a explain it better than i can.

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