Originally Posted by Ironhinge
Another hypothetical question. If one wanted all power sources to run though the same charger, what is the best way to accomplish this?
I was wondering if it is electrically sound to use a 12v regulated power supply to run the trailer off of mains and then to run it though a step-up transformer to emulate a solar panels voltage and feed it through a solar charge controller that manages the battery
The idea would be that the trailer would have a solar panel
and this 12v converter and both would run though one charging system.
To be clear this is a question not a plan... I kinda want to take some electrical
engineering classes. I think I am in the realm of just knowing enough to be dangerous (:
I am assuming that by a "12V regulated power supply" you mean a supply designed to power radio or similar equipment with a regulated output of around 13.8V at 20 or more amps. If so then you could simplify your planned system considerably by eliminating the step up "transformer" from your design.
I am using a system similar to what you describe to provide DC power in my EggCamper
. The main AC/DC converter is a Samlex SEC1223BBM power supply with a regulated output of 13.8V +/- 0.2V at up to 23A and terminals for connecting an external battery. This is a power supply commonly used to power ham radio equipment configured for emergency battery backup and is available from stores such as Ham Radio Outlet or Radio Dan.
With 120V AC supplied the Samlex supplies the coach DC buss with 13.8V DC and, when AC power is lost, the output buss is automatically switched to the battery. When AC power is restored the Samlex again automatically switches the coach DC buss and the external battery is charged at up to 4A. The external battery connections go to a 100AH flooded lead-acid battery, paralleled with the output of a solar panel
This system has been in use for several years now with no problems.
If you have further questions or my system description is lacking in detail send me a PM.
BTW - a transformer is an AC device that would not be happy with a DC input.