Many customers choose to setup Renewable Energy systems in properties, remote or otherwise, for seasonal or periodic use.  As with all systems, the battery bank used to store this power does require ongoing maintenance and consideration to maintain good health and ensure loss of capacity or battery damage does not occur.

When deep cycle lead acid batteries are not used for extended periods of time customers should consider the following options: 

a) maintaining the system online to keep the cells at a full charge.


b) disconnecting the battery bank and topping them up with a refresher charge every 60 days to prevent full discharge and/or freezing.  


When returning for seasonal use, electrolyte levels should be checked and distilled water added as necessary.  In colder climates, keep in mind that snow removal from solar panels may also be necessary to maintain proper charging.  Live systems unable to generate power will quickly discharge the battery bank.

Note:  discharged batteries are prone to freezing in cold temperatures.  Damage to battery cases/cells is not valid for replacement under warranty.  By maintaining a charge on all cells the specific gravity of the electrolyte will prevent freezing-related damage or discharge under normal conditions.

Rolls Battery recommends conditioning the battery bank in advance of use.  Three to four (3-4) weeks before resuming use of the system you may begin to lightly cycle the batteries over a one week period as outlined below, ending with a corrective equalization of the battery bank.  Where multiple strings of batteries are used, run the corrective equalization on each string individually and reconnect to the system prior to cycling.  This will begin to remove any build-up of sulfation which has accumulated while resting in a Float charge for extended periods.

Day 1 Run Full Absorption cycle
Day 2 Rest (place a small load on the bank to begin discharge)
Day 3 Rest
Day 4 Full Absorption cycle. 
Day 5 Rest
Day 6 Rest
Day 7 Full Absorption cycle, followed by a corrective equalization*.

*Corrective equalizations should be at minimum 2 times per year, performed prior to and following each off-season.