Instead of using a breaker, when I do installs of inverters, I use a fuse and locate it right close to the battery. Even the manfactures who put inverters in a coach will put the inverter fuse on the wall and wire directly to the battery. What size wire were you planning on using? Because size will depend on how far from the batteries you are putting the inverter. Is this just an inverter or does it also have a 3-stage charger built in? If it has the charger, remember to disconnect your old converter, (i.e just unplug it from the ac line) it can be left connected to the dc side.
On the output side of the inverter, how many circuits are you planning to have connected to the inverter? Does the inverter have it's own output breaker? If not, then put a small service panel of 2 or 4 breakers to protect the load side of the inverter.
Hope some of this info helps and didn't confuse you. Good luck.
Renegade (Jim) & Wrangler (Doreen)
& 4 attack cats, TJ, Shadow, Chessie, RJ
along with 2 who adopted us, Tom & puddy.