I went to tungnath and chandrashiela in oct. The place is accessible if there is no snow. By the end of nov there can be snow and tungnath become inaccessible to regular tourist although can be visited with preparation. If somebody is going with family that I recommend to stay near ukhimat which is on the way and have electricity. As chopta is reserved location so there is no electricity there.
Only solar powered lamp work. Morever if somebody is looking for adventrous stay. Than they can stay at near by camps at chopta. The deoriatal is also very nice place and can be visited in day and camp stay is available in reasonable price. I recommed it as a beginers trek.