If you have solar PV and live in New England, you are probably making a lot of power from your solar PV system today. Where we live, it has not gotten above about 5 degrees F all day, and we have been making a lot of power. This is because PV modules are more efficient in cold weather, and have higher output.
When designing a PV system, it is imperative that the increase in output during cold weather is considered when selecting an inverter and overcurrent devices to ensure that this equipment can handle the potential increase in power. If these devices are undersized, it could cause the system to shut down when it has the potential to make significant amounts of power. Besides, what else is there to do on a cold New England day but watch your meter spin backwards?