Help with voltage regulator circuit, please

I have 12 volt lead acid batteries in a sailboat (charged by solar panels - up to 16 volts during equalization) and would like to power a WD Media player and a Wii from the 12 v supply.
Both devices came with 110v adapters that output 12 vdc. Do I just need a simple 12 v regulator to make this work? (I have seen capacitors and other stuff - to smooth the supply, it said, but isn't the main 12 v batteries enough of a capacitor?
WD media player needs 12 v 1.5 Amp
Wii needs 12 v 45 Watts
What parts do I need to make this work? Thanks for your time.

 

Thanks Bob.
What about protecting against over voltage during the day when the solar panels drive the voltage up - usually to 14.4 volts under normal charging and as high as 16 volts when 'equalizing' the batteries?
I thought a regulator would limit the voltage, but have not seen a 12 v one that handles over 1 Amp at RShack.

 

I'm only concerned about protection from over-voltage while the batteries are being charged by the solar panels.
If the voltage drops I can hand-start the diesel engine to charge the batteries - or just not use the devices.
45 Watts at 12 volts is 3.75 Amps. If a 4 Amp regulator is available, is that all I would need?

 

A buck boost converter multiplies the input / output value. I think like a transformer of sorts. I have 12.0 to 16 volt input range that I need to regulate an output of 12 volts. Don't I just need a voltage regulator?
Rshack has 12 v regulators up to 1 amp, but I need about 5 amps (to handle 45watts at 12 vdc)
Is reference voltage the same as dropout voltage? Is this why I have not found a 12 volt 5 amp voltage regulator?
I think the Wii car adapter is merely a cigarette plug adapter with 12 v plug on the other end of the cord. Also a car's battery voltage does not go higher than 14.4 volts. I need to protect the circuit from 16 volt solar panels during battery equalization.

 

Sounds great. Any leads to where I can locate one? All of the buck boost converters I've come across 'step down' 24 volts to 12 or 12 down to 5 etc.
Can they handle varying input voltages, say, 11 to 17 volts? (Output 12 volts)

Many thanks for your help!

 

Yes, thanks, I did Steve. Two points though; As I stated, I need something that can handle 45 watts, this unit only handles 25 watts. Secondly, isn't part of the objective in electronics tinkering and this projects forum to create solutions that don't cost a ridiculous $60 plus dollars to solve a $10 problem?
I don't intend to be rude. I very much appreciate your input and time. I just thought there was a 'simpler' method of regulating 12 volts.

 

Thanks for your help. The 60 Watt DC/DC adapter you found, Steve looks like it would work. Ideally I was hoping to make something smaller than the 'brick' this uses. Space on a sailboat is at a premium, so if we could come up with something smaller I'd be very happy.
I guess from the start I was thinking along the line of a voltage regulator like BobK has found. Thanks Bob. At night the boat's batteries never drop below 12.1 volts. I'll see if I can find out what the minimum voltage the Wii will operate at.