mikevet wrote: My question is, if shore power is available can I still just run off the battery and just use a 110 volt charger to keep the battery charging while using the battery for all my 110 and 12 volt needs? To me it would allow allow me to run less wires over all. Ideas? Thoughts?
It depends on your charger. Typical "dumb" lead acid chargers when used as described will max their output current trying to supply the load. And that means the charger will run hot which is bad for the charger. Most lithium chargers limit their charge current to protect their circuitry and the battery. However, using them the way you describe may mess with their balancing operation.
A better way would be to only use the charger when the loads are zero or tiny. Alternately, have two batteries with proper isolating/selector switches and use one battery for loads while the other charges. But you have to be VERY careful to not switch the batteries to parallel output useless they are BOTH at the same charge/voltage. You'll get a surge of current from the higher charged battery to the discharged battery. That current is unbalanced so if the cells' IR doesn't match you can have problems. If you go that route, be sure to fuse the battery leads.
It would be safer to have switches to select between shore and onboard power for loads, isolating the battery when on shore power. That might mean an extra transformer to run your 12V system when on shore power.