installing Inverter

Personally, I think hardwiring the inverter is not really convenient.  It limits where it can be used.  I prefer to plug it in where it is needed.  I agree that a pure sine wave device is un-necessary.

Originally posted by WillThrill Correct, the breaker box is where you will connect your positive (hot and red) lines, and the buss bar, generally screwed into the floor, is for neutral (white).

One correction. The bus bar attached to the frame or floor is the Ground, not Neutral. It is populated with bare wires, although it may have some white wires too. The bus connecting only white wires is the 120V AC neutral and should not be grounded or used for 12VDC grounds. This is a safety issue.

If I understand your situation correctly......

Installing a 2 amp fuse would limit the amount of current to the charging port to 2 amps. If the device exceeded that, the fuse would blow. Most phones, tablets, etc. require less than this.

This might "come into play" if the device being charged were to malfunction and pull more than 2 amps. The 2 amp fuse would blow before the 15 amp fuse. Your 10 or 12 gauge wire should handle the 15 amp current OK so, little danger of it overheating/fire. If the device is pulling 15 or more amps, the 15 amp fuse will blow. In either case, if you are blowing fuses when attempting to charge, your device probably needs serviced or replaced.

So, in short, installing the 2 amp fuse would be good and most safe but, you would probably be OK without it.   

Originally posted by dherman201 Charlie do you prefer the cigarette lighter socket and then use the USB adapter .  I bought a couple of USB sockets and thought I would just use them.  Guess the cigarette lighter socket gives some other options.

The USB 12V sockets with USB adapters are just a bit more versitile, and less expensive to replace if they fail, but the Blue Sea products are excellent and will serve very well. To your later post, the extra 2A fuse is not required. The fuse is to protect the wire, not the device. #12 wire protected by a 15A fuse is adequate. The USB adapters themselves would not require #12, smaller wire could be used since the total for two would only be 4A, but I would run #12 anyway. It's just as easy and you might want to change or add a socket someday.

Originally posted by dherman201 Thought it was kind of strange. It's not like it is going to protect the phone from a surge of any kind, right. . It also says it is a 2.1A plug. I would think if anything else shorts the plug the 15 A fuse would blow.

Just to be clear, the fuse is not there to protect the device. It's there to protect the wire. You can connect wire that is just large enough to easily carry 2 amps to a terminal that is fused for 15 amps as long as you include a 2 amp fuse.

If your 2 amp device fails and draws 14 amps, it will blow the 2 amp fuse but not the 15 amp fuse. If you do not include the 2 amp fuse, the wire will overheat to the point of catching on fire. Fire is bad.