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depends on what you need the battery for. I put up a solar panel at my dacha about three years ago and haven't regretted it. I work as a long-haul driver, so I'm mostly at the dacha on weekends, and electricity there is used sporadically - fridge, irrigation pump, sometimes TV in the evening. the battery's enough for me to not depend on a generator and not have to run cables from the neighbors. works great in summer, fine in spring and fall too, but in winter it's pretty useless, though I'm rarely at the dacha in winter anyway
I think it makes sense for a dacha if first of all it's not your main residence and you're not planning to plug in an electric stove or air conditioner. second, make sure the payback period is reasonable - if a battery costs 8 grand and pays for itself in 15 years, that's not great. third, better to get a panel with a battery, otherwise you'll be dependent on the sun and time of day. I installed a 3-kilowatt system, plenty enough for a vegetable garden with a pump and lighting
if your dacha is in the Moscow region or somewhere in central Russia, then definitely it makes sense. the climate's right, there's enough sun in season. but if it's in the northern regions, it might be too expensive to pay back
It depends on what you need electricity for at the dacha. If you've just got a weekend cottage where you occasionally use a flashlight and charge your phone, then solar panels will be useful. I jog in the mornings myself and often come to the dacha with friends - when there's no grid connection, a few panels with a battery save the day. The lights work, you can boil a small kettle, charge your laptop. But if you're planning to keep a fridge there, run a pump constantly or something else power-hungry, then batteries alone won't cut it.
The main thing is to calculate realistically - how many kilowatt-hours you actually need per month. There's plenty of sun in summer, but in winter or on cloudy days the output drops significantly. Plus the battery is expensive and you'll have to replace it later. If the power grid is far away and connecting it costs a lot of money, then the batteries will pay for themselves. But if the grid is nearby but you just don't have a connection, it might be simpler and cheaper to run a cable than to mess around with panels.
Anyway, calculate your needs and check the installation rates. If you've got low consumption and want independence, why not. I'd definitely get a few panels - when you're jogging early in the mornings and then spending the whole day at the dacha, it's nice to have light and the ability to charge your gadgets without the hassle of a generator.
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