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The inverter is only designed to deliver 300 watts, so no.
There must be a battery in there, you didn’t mention it. If you work out the current that a suitable inverter would need to draw to drive a suitable inverter, and the battery is able to safely supply that current, you can cook your toast.
However you must then look at the solar panel, at 45 watts it will take some time to charge a suitable battery for the job. And it can only do this when there is sufficient sunlight. So the time it can charge at 45 watts is limited in a 24- hour cycle.
Ultimately, the 840 W for your toaster needs to be supplied from the 45 W panel.
Toaster requires 840 watts your solar panel can produce only 40 watts,That is not enough.
300 watts inverter is no use with45 watts DC supply from Panel.It will make 45 watts Ac only.
I guess you could try various loads on your setup, and also note how long the battery takes to recharge.
Then, come back to Y!A, and you can answer from experience, other people’s questions on this 45 watt kit.