do you have plans to add heat accumulator's that item that can store heat for night time usage and such

It is something I thought about a long time ago (I touched on it in this thread), but heat accumulators would be worse than useless in relation to this particular mod. Since the panels constantly dissipate heat energy, increasing the heat capacity of a heat network would only lower the efficiency of the system, because it becomes much harder to break the temperature threshold required for steam production. (Even without the heat loss mechanism, they would only be useful on planets with exceptionally long nights.)

They would definitely be useful for buffering heat energy in large nuclear setups, but that is outside the scope of this mod.