Hi Shaun2k, try to have some patience with us 
You asked some fairly technical questions, not everyone here has the expertise to answer such questions, there are some good and knowledgeable people here who might be able to answer you.
Another place you can go for answers for these types of technical questions is https://groups.yahoo.com/group/12VDC_Power/
that group is all about 12 volt off-grid power.
Wretha
