Originally posted by steve1709
reply to post by chr0naut
'day chronaut Thanks for your great post. Any chance of some comments on say a set of solar panels and the associated inverter and a way of making
sure they still work after an EMP plz of if it happened before them being protected, what would be needed to get the panels up and running again
It's all about the effectiveness of the receiving antenna. If you could break up the antenna into smaller segments and isolate them from each other
sufficiently, the overall current through each would be reduced.
This is what they do with mains power grids when a CME is incoming. They throw circuit breakers that isolate bits of the grid into smaller segments
rather than linking across vast areas.
Because EMP from a nuke is more like a radio wave, the antenna length would be much shorter than a ULF 'atmospheric charge' event like a CME would
Silicon cells are usually small individual elements connected together by wire links, you could replace these wire links with fusible links that would
burn out well before the silicon is damaged.
OK, the next bit is very "back of the envelope" and approximate because I don't have on hand the specifics of Solar Cells or of EMP conditions, but it
would probably be an OK "rule of thumb" to start from.
Generally, damage occurs to silicon devices when the voltage is usually at or above 400 volts (actually, usually closer to 3kV but i'd rather err on
the safe side). So, we could use standard low voltage fuses. They have to be "fast blowing" or "quick acting" fuses because an EMP is a short duration
As the max current you will get from a 152mm silicon solar cell is less than 8 volts at 160mA, all you have to do is find some 0.2A (200 milliAmp)
fast blowing fuses and enough fuse holders to match and re-wire these in between your cells and you are set.
Should an EMP take out your solar panel, a pocketful of replacement fuses will get you up and running again in no time.
Note that the internal resistance of the fuses will also probably limit the efficiency of your panel a bit too, but it shouldn't be too bad.
Note again that you MUST have fast blowing fuses! Ionization effects can cause air resistance to drop and at very small distances, you still might get
conduction through a partially blown fuse.
Protection of the inverter is a bit more of a problem.
It would be best to isolate it close to the inverter (put circuit breakers close to the inverter on both the input and output side so there's no runs
of wire) and sit the whole thing in a ferrous metal box to deflect magnetic as well as electric effects.
If it's a true RMS inverter, it will likely have a large transformer which will convert a magnetic pulse to current very efficiently and will fry the
rest of the power circuitry. Again, fast blow fuses might be your solution here, but they would have to be rated at just above the transformer
If your inverter is fully solid state, then I don't really know how you'd protect it beyond EM shielding and putting circuit breakers on all runs of
(I suppose you could pray).
edit on 30/5/2012 by chr0naut because: (no reason given)