Why I made this?...
Sometimes I Got feelings like my heavy plants of Accumulators doesn't fits all of those laser turrets needs..

Accumulator:
Capacity 1TJ (it is actually 1,000 GJ, 1,000,000 MJ, or 1,000,000,000 kJ, 1,000,000,000,000 J)
Recharge Rate is 1MW.
Discharge Rate it 1GW.
So actually you are chargin' it up for 1 milion seconds (~277 hours with mods it can be 3x faster)... but can discharge it in 1 Thousand seconds (~17 minutes, with mods it can be 3x faster).
If you stack it, it completely cover laser turret power spikes. (Got 7k Laser turret spike and it was fine, actually having 30 of them charged to 1TW - 29 TW still remain to be charged.)
Or give you a time to build new nuclear reactor pack.
Avialable from Start the game, but its not cheap...

Works with Angels and Bob's mods, should work with Xander mod, Omnizelos mod's, Pyanodons mod's as well.
Working with Seablock (but as well is too op for seablock marathon).
Credits...
Thanks to Bobingabout for tips.

ver.:
0.1.4 - Renamed and Added solar panel > https://mods.factorio.com/mod/uscrfdsolaraccu
0.1.3 fixed for big mods
0.1.2 Fixed some missclicks - tested with some big mods.
0.1.1 fixes some misclicks
0.1.0 Release