Join Date: Sep 2008
Location: Victoria B.C. Canada
Thanked 96 Times in 87 Posts
Rep Power: 8
Re: Electrical System Update
Just because you have more battery capacity doesn't mean that you use more AH. It is not any tougher to put 100 AH into a 900 AH bank than a bank half the size. The larger the battery bank the higher the SOC they go down to with a given load. Because of this they will last longer. Due to Puekert there are gains in bank size beyond the 20 hour rating as well with a given load.
A 100 AH battery with a 5 amp load is 100 AH. A 200 AH bank with the same load is somewhat more than 200 AH.
Living aboard in Victoria Harbour