The fixed position solar panels are powering a 12v battery system, two batteries, attached to a 400w DC to AC inverter. In all it powers an automatic chicken coop door, a light, and the water heater.
The chicken coop door power needs are from a 12 v battery so it does not work off of the power inverter.
The power inverter is a relatively efficient inverter near 96%. It powers a 4w LED light that is on timer (2, 4, 8 or dusk to dawn setting), and a 50 w birdbath heater in a 5 gal. bucket (filled with water) that uses horizontal nipples. There is no insulation at this time on the bucket. The bucket rests on a 8 inch wood platform.
Some small freezing has occurred when the water heater depleted the batteries after a several day snow storm. Overall using a 24 v system is more efficient to power the inverter which may be my next step since it is free to change.
I had considered going to a all 12v or 24 v system without an inverter. This would help improve efficiency but the cost is stopping me (100 dollars). If I started this project again I would skip the inverter and use a 12 or 24 v system.