how long can a passive house really go without sunshine?
yesterday it stopped raining and was a bit sunny here for 4 hours. That was the first sun in a week. It did little to heat my house up even though we have excellent exposure, overhangs and the such. The weather forecast is for rain till friday then cloudy. It's been crappy like this for almost 3 weeks now.
If I was going solar I'd be grid tied simply because the winter has so little productive days compared to the summer which can easily make an excess.
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