[Marsymars]

Yeah, I mean these aren't entirely theoretical, like observationally, people I know locally are getting <10% January vs July generation - I'm working backwards to get the relative proportion of the drops due to solar hours vs irradiance.

They all have a relatively generous (I think - I'm not especially familiar with policies anywhere else) grid policy where they sell back any over-production in the summer. (They switch between summer/winter rates, so in the summer they buy/sell at ~35c/kWh and in the winter they buy/sell at ~8c/kWh. These rates are only effective as long as you don't have a net-surplus of generation in the year, so it doesn't make sense economically to oversize the system for more winter generation, as then you'll be generating more in the summer than you can use or sell back.)