Solar units: Turn off and disconnect from the fence. Face the panel south (toward sun) and let charge for 1-2 days. Disconnect leads from battery terminals and store the unit in a temperature controlled climate.
Batteries: Charge batteries to full and store in a temperature controlled climate. Batteries must maintain above a 40% charge at all times until ready to use. Falling below a 40% charge damages a batteries ability to hold a charge or to be recharged.