I found the instruction manual for my Prosine was rather complete.. Still I had it installed by Camping world ... THey only screwed up two things on that install and two more on the oil change they did at the same time.. I AM NOT KIDDING.
THe install is very basic, with only a few "TIPS" not in the manual
First.. LOCATION LOCATION LOCASTION Since a big inverter draws BIG TIME 12 volt current you want it close to the batteries,, but NOT breathing the same air (Battery fumes bad for inverter)
Next Whatever size cables they say to use (12 volt side) UPGRADE one or two sizes and for as much of the run as possible tape the positive and negative cables side by side (or use a split loom) I suggest red for the positive and black for the negative (Wire insulation color)
So much for the 12 volt side of life.. Now the 120
Determine what circuits you want INVERTER powered.. IN my RV that is the Televisions and related electronics,, GFCI chain and MIcrowave
Put in a SUB PANEL and transfer these circuits to it,, IN many cases you can actually use the same breakers.. NOTE: Sub panels generally do NOT have a main breaker and also do not bond Neutral and Ground (Ever on that).. NOTE 2: In some cases the sub panel may be part of the inverter itself. Mine is not, I like mine better, If I trip a breaker I DO NOT need to go outside to reset.
Replace one of the now unused breakers (or moved breakers) with a 30 amp, if you moved them block off the others for safety (Gorilla tape works well).
10 Ga (or 8) from that 30 amp breaker in the main box to a 2,000 watt inverter/charger.. and a 2nd 10ga back to the sub panel. Use a sharpie to label them IN and OUT at the inverter..
And that's all folks
Oh Batteries.. One Pair GC-2 per Kilowatt of inverter, DO NOT FORGET THE FUSE
