Comment Re:Total System Cost (Score 1) 183
> Solar panels require an accompanying energy storage system
So put a small battery module under each panel. It's not like much can grow there besides grass, and there's plenty of that between rows of panels.
You've got what, a 2x1 meter plot of land for each panel? If you allow for a 1 meter panel height, that's slightly less than 2 cubic meters of volume you could fill with batteries (allowing for some loss of volume for the module's outer casing). That is a LOT of space, even if what you fill it with is little better than a stack of car batteries. The panel would then simply be mounted directly on top of the battery module's outer casing, with an appropriate tilt of course.
Since the panel is already producing DC, you'd only need a beefy diode on its output, which then leads to the master power rail that feeds the inverting station. The battery module would need a regulator circuit on it since the panel's voltage is by definition variable, and a circuit that'll hard-bridge the battery to the primary rail when its voltage exceeds the panel's (that's the reason for the big diode -- some panels will actually emit light and then burn out when excessively back-fed).
Need more storage? Make the battery module 2 meters tall, and either just adapt your maintenance process to deal with the height, or better yet dig a hole and bury the bottom half, and design the module so that it can trivially be raised out of the ground for maintenance. That would naturally mean sacrificing some of the horizontal dimensions for the lift and the hole's retaining walls, but then you can use as much height/depth as you want, up to the load limit of the ground under it.
The inverting station still has to deal with a variable incoming DC rail, but now it'll be less-variable than before, and it merely has to be regulated, inverted, and sent out onto the grid, without the need for a dedicated battery facility or building expansion. The cost savings on that would surely make-up for the increased cost of having all those per-panel modules.
If a battery module goes down, just shut the damn thing off until it can be repaired or replaced. The panel can keep providing juice, and the inverting facility won't even notice either way (sure, I realize you could do something similar with an all-in-one storage facility, but this seems like it would be easier to deal with).
There, that solves the storage problem pretty well, imho.