3 kilograms of sugar to 2 liters of water. Is my sugar syrup recipe.
I just checked the larger hive i didn't go all the way into the brood nest but they have 10 frames of stores now. I gave them more food and left them to do what ever bees do in the fall.
2 liters of water equals 2 kg. that means that you have a 3/2 ratio. That is a bit thin for putting into a hive going into winter. I recommend at least 2/1 ratio or 4 kg of sugar to 2 liters of water.
This requires less drying time and puts less moisture in the hive. Heat the water, remove from heat and add the sugar. Carmalized sugar will make your bees sick.