This installation was completed in March of 2024. The customer contacted me with very modest power needs.  The customer had a small travel trailer and simply wanted the 120 volt outlets in the trailer to be powered when they were not connected to a shore source.  I came up with a simple system design and the customer accepted it.  We set the installation date and the customer brought the trailer to me.

The installation was completed the same day the customer delivered the trailer to me.  The customer planned to keep the existing lead acid batteries for now.  They will probably upgrade them in the future, but were trying to keep the system costs as low as possible.  I added a Victron Phoenix 12/1200 pure sine wave  inverter with a Magnum Energy TS 15 transfer switch.  The transfer switch was installed in the circuit that powered the 120 volt outlets in the trailer.  Fortunately for me as the installer, the trailer manufacturer added a wire loop for that circuit into the small pass through storage at the front of the trailer.  I cut that loop and connected the Magnum TS 15 transfer switch in line in the circuit.  The TS 15 was then simply plugged into the Phoenix inverter that was mounted next to it.  I added a VE Direct Bluetooth Dongle to the inverter to allow the customers to control it from the Victron Connect app.  I wired the inverter to the batteries mounted on the tongue A-frame with 2 AWG wire and added an in line Mega fuse.  I also added an IP65 rated Victron 500 amp SmartShunt to the battery bank.  I installed the shunt in the battery box with the batteries.  Because this box is outside (even though it is covered), I chose to use the IP65 rated shunt rather than the standard shunt.  The installation was pretty simple and straight forward.  The most difficult part was finding the best path for the 2 AWG wire to get to the batteries.  Because the manufacturer provided easy access to the 120 volt circuit the customer wanted to power, I didn’t have to run any new 120 volt wiring.