What to look at monthly, quarterly and annually.
Monthly and quarterly checks
Monthly: terminals and enclosure. Quarterly: balance and capacity trend.
Annual review and documentation
Once a year, compare delivered capacity against the commissioning baseline.
Maintenance & testing questions
Short answers to the ones that come up most.
How do I test a battery?
Resting voltage, then under load, then internal resistance.
Lithium maintenance?
Terminals, ventilation, BMS log.
Swollen battery?
Stop using and replace it.
Storage?
Half charge, cool, disconnected.
When to replace?
When delivered capacity no longer meets the job.
