We have two 12v marine batteries connected in parallel – they power some LED lights and a small inverter used to charge a laptop and the odd camera battery. The marine starter batteries are about 2 months old and are charged from a couple of solar panels.
If we purchase a new deep cycle battery (or two new ones) what is the recommended way of connecting these to the existing batteries? Is there a name of a device that handles the different batteries (ie: charge / discharge separately)?
Is it possible to use the new and old battery bank at the same time (charge one, use the other, auto switch between)?
My understanding is connecting new different batteries in parallel would not be efficient (crappy ones drain from better ones).
Currently travelling and coming up to a bigger town and looking to buy something there – need to know what I'm asking for :)
Thanks ! Dave