full_mosey wrote:
A deep cycle battery is designed for discharges which may accumulate to 80% over a period days before recharging.
Although if you regularly draw down any deep cycle battery more ~ 50%, particularly flooded, you can expect total life will be greatly reduced. However, the OP indicates the only time he may rely on battery power as being those few times he may overnight in a WalMart parking lot while on his way to a destination where he would have shore power available. For him, as for myself, depth of discharge or achieving maximum cycle life from a deep cycle battery is moot as the battery will die of old age long before it ever sees it's maximum rated cycle life. Just about
any 12 volt battery would serve his purpose just fine.