Battery Basics Tutorial
-
- August 21, 2012
Measuring a marine battery’s state of charge helps prevent starting battery life. State of charge, or SOC, estimates the usable energy remaining as a percentage.
The correct method depends on chemistry. Resting voltage works reasonably well for lead-acid batteries, while a shunt-based monitor is more dependable for lithium iron phosphate. Identify the battery type before interpreting a reading.
What Is a Marine Battery’s State of Charge?
State of Charge vs Battery State of Health
State of charge describes how full the battery is at the time of testing. State of health describes how much capacity and starting performance the battery retains compared with when it was new. A battery can be fully charged but still have poor health and fail under load.
Why State of Charge Matters for Marine Batteries
Checking SOC helps you decide when to recharge, whether the charging system is working, and how long onboard equipment can operate. It is especially important for trolling motors, fish finders,
