I've been doing a no-solar playthrough and even without any need for solar cells I've had no problems at all with an excess of silver. It can be dumped into green circuits easily, even with BZ massively reducing the total number of needed circuits.
Since silver is a byproduct-only resource I am hesitant to increase the demand for it by too much - the potential is always there to run into a corner case with some specific mod loadout where you need so much silver that it becomes impossible to get rid of all the copper, lead, and gold.
