Yes - two gardens hoses will give your twice the volume of water
. What makes a more important difference is the allowable draw down (removal of amp-hours) before you start to damage the battery (decrease its useful life). Thin-plate auto batteries cannot tolerate deep discharges while (aptly named) deep-cycle batteries will do better.
- - What most small boaters/sailors forget is "cost effectiveness". They think they must buy the exotic batteries at 4x to 10x the price
just because they have a boat. If you are "daysailing" or only doing weekends - Walmart car batteries work fine for starting your boat engine
and their $40 marine batteries work fine for house lights, etc. You can replace them up to 10x before you equal the cost of an exotic (gell/AGM) battery. A new set of Walmart batteries each season will save big bucks especially when you factor in that you do not need all those fancy chargers, controllers, monitors, and other "required" accessories for "exotics."
- - If going offshore
or places where getting replacement batteries in neither convenient or possible, then the fancier batteries are called for along with all the "extras" needed to keep them up. Otherwise, use that money
or better sails