It's not clear to me why you would hold 100 hours of energy, assuming you discharge at maximum power. If you want to store energy from summer to winter, then 4 days of energy is nothing. Even if your average discharge is only 30% of the maximum power, you still get only 2 weeks of energy. And if the use case is day to night, then 8 hours of storage is enough. Maybe the idea is that the houses in Finland are so well insulated that you need heating only in cases of extreme cold, and only during the night, 100 hours will do the job?
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