I'm thinking of a solar system for my trailer.

I wont be using any device that works with grid altern current, well actually i will, but all of them use ac-dc converters and work with 19, 12 or 15 volts.
I could use an inverter and i would connect all my devices throuh the ac-dc-converters, but this seems a little stupid: have solar panel and bateries with 12v dc, convert to 220v ac and then back to 12, 15 or 19 dc. Stupid but versatile, as i wouldnt have to worrie with diferent voltages.
So, i would like to have a system without an inverter (12v dc to 220v ac) but i have the different voltages problem.
What do u think about this options and what solutions can you think of?

 

Many portable or RV systems are designed to work on 12V batteries which could be between 12V and 14V.

If you need voltages higher than that you can use a DC-to-DC boost converter set to your desired voltage. These circuits can be very efficient, greater than 85% efficiency.

 

Tough spot you have there. What runs on 15 and 19V? All my appliances run on 12V in my camping trailer.

 

actually i dont need 15v, what i need is 5v for my smartphone. 19v is for my laptop.

 

5V is easy - just get a car-to-USB adapter. Very inexpensive and efficient. Or you could make your own with a 7805 regulator. Not as efficient but very handy.

There are also car-to-laptop adapters but they aren't so cheap. An inverter may be the best option for that.

 

Use a 24 volt system with solar charging of each 6 volt battery.

Then you will have 6-12-18- or 24 available to regulate down with linear regulators.

The loss in regulator efficiency would be countered by simplicity.

 

what do you think of things like this?
http://www.ebay.com/sch/items/?_nkw...udhi=&_sop=12&_fpos=&_fspt=1&_sadis=&LH_CAds=

 

Another option. Or this. A lot of info here.