Adding a second battery?
My new to me TT has a 12V Interstate deep cycle marine/rv battery, spm-24. Looked on line and it offers 140 min. at 25A and it looks like I'm could use as much as 10 amps an hour without the furnace ...
Forum Discussion
Carolyn,
What I fear you do not understand (don't feel bad) is that two 12V batteries in parallel will be hard pressed to give you capacity X 2. Even if they came off the assembly line together, they will never be that well matched after the second discharge. Also, real deep cycle 12V batteries are rare and expensive, but 6V (three cap) golf cart batteries are very available and very durable.
There is also a new twist to all this. Theft....
I believe that most often batteries are stolen to be used by the thief. As scrap, they only bring about 5$, but if you can replace you bad car battery, the relative value is much greater.
So, when they rip open your battery box and find batteries that won't fit under the hood of the wreck they are trying to drive, they leave empty handed.
I've been doing boat electrics a very long time.
Matt
What I fear you do not understand (don't feel bad) is that two 12V batteries in parallel will be hard pressed to give you capacity X 2. Even if they came off the assembly line together, they will never be that well matched after the second discharge. Also, real deep cycle 12V batteries are rare and expensive, but 6V (three cap) golf cart batteries are very available and very durable.
There is also a new twist to all this. Theft....
I believe that most often batteries are stolen to be used by the thief. As scrap, they only bring about 5$, but if you can replace you bad car battery, the relative value is much greater.
So, when they rip open your battery box and find batteries that won't fit under the hood of the wreck they are trying to drive, they leave empty handed.
I've been doing boat electrics a very long time.
Matt
