I think it is more what is suggested rather than recommended as everybody is different in their tolerance of carbohydrates but a good starting point is no more than 130g per day. It is better to have the carbs fairly evenly rather than a large amount at any one meal.
But as suggested a blood glucose monitor allows people to find the amounnt at any one meal by testing before eating and after 2 hours aiming at no more than a 2-3mmol/l increase and as levels come down no more than 8 - 8.5mmol/l 2 hours post meal.
You are aiming at 4-7mmol/l fasting or before meals.
Edit- so as not to confuse, the OP is Type 1, I had not noticed the other post. Apologies