Unless you have some alternate source of AC power, the 1700W is ultimately coming out of your 12V batteries, so 142 Amp through that wiring and out of the Lithium cells. As John indicated, that's comparable to cranking a starter motor. Big juice. Think of a fire hose rather than a garden hose.
The 15A breaker in the inverter must be on the "output", ie 120 VAC side. So check what breakers they put in the 12V side. Also find out the AWG wiring gauge.
You might contact the guys who did the installation, tell them what you powering, frig, stove, etc, and get their comments.