Solar power propagator?

Im just wondering if there is such a thing as a solar propagator? I would like to grow a variety of plants from seed this year. I’ve recently moved and there’s an old greenhouse at the bottom of the garden there’s no power in the garden so I’m wondering if there’s any affordable alternative if there’s no electricity?
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My heated propagators use 100 watts, which is quite a lot and such a setup would need a substantial battery to hold the charge for when it's needed.
I'm sure there are DIY options that would work.
I recall a gardening prog. some while ago where a guy had rigged up solar panels to heat tank of water which he then used to heat his greenhouse - but I doubt it was a cheap option
Wisdom is not putting it in a fruit salad.
It is still very useful for starting seeds off. An unheated greenhouse, with an unheated propagator, still gives a useful advantage.
for the fag ends of the aristocracy.
Sadly apart from 2 panes the rest doesn’t appear to be greenhouse glass at all but old frosted bathroom window glass completely the wrong size too ☹️ Oh well the roof is intact and I’d say about 90% has glass now and with some clearing of the runners and some wd40 the door slides!
ive cleaned out the gutters so need to find a way of collecting water that isn’t going to be expensive!