Needs a longer answer, but the basics are:Good question, like do they have a use by date if sitting in storage?
I also wonder about if the grid goes down, I don't have a battery for the solar but I think they are around 25K. If an EMP went off, would that just wreck all solar equipment anyway?
Off-grid electrical systems often have a lot of electronics to optimally control them.
There are even some electronics which must "modulate" the voltage level of solar panel voltages into batteries, though admittedly I do not know all of the details. So, an EMP might destroy the controlling system, but the solar panels and batteries might work.
BUT, there is something called MPPT (maximum power point tracking) which is often part of a caravan solar panel system (and perhaps a fixed location system as well). I do not know whether there are any integrated circuits in such a system which can be destroyed, but my first inclination is to say "yes". DYODD (do your own due diligence)
An alternative to MPPT is PWM (pulse width modulation), which is not as efficient as MPPT for caravan use, but I do not know whether that is true for fixed-installation use, nor do I know whether it too uses integrated circuits. DYODD
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