ppip can store phot/elec, which has a sprk/area ratio of 1 and you know how to do the rest.
Or to go further, using catelite's method with slight adjustment, which utilize the secret storage space of each portal channel to store 240 phot/elec per px., then use layering to compress 5 PRTI channels into a single px to achieve the sprk/area ratio of 240*5 = 1200 sprk pre px.
Of course you need to control the rate that ppip/prto releases the phot/elec to a maximum of 0.125 sprk/frame or the solar panel would waste some energy before it is able to be conducted.

Ultimate solution by far:
E-hole + snow(phot/elec)

Everything here is just theory, no real product.
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Flaw of the rules(Bypassing the limit on btry, dtec family, conv(sprk) to get infinite power within small area):
pscn+nscn loop
clne(sprk) can produce unstable sprk flow

@lamyipfu: You don't even need the pscn+nscn to create a loop that produces infinte power. Almost any conductor will do. id:2160479 

Also... here's my entry for the contest:

I know it is not needed, but it is nearly effortless to create such loop with pscn+nscn single gateway so you don't need prop tool.
Anyway, nice work for the capacitor. Hmm, never realized dray could stack energy particles directly, that meeanns in-game layering machine.

@lamyipfu: indeed

@LBPHacker (View Post)

 *uses console to put SPNG's life to 65535*