I got an open circuit voltage of 12.63 volts. So I grabbed my multimeter, prepped it to measure DC voltage, and touched the probes to the battery terminals. The battery was already at rest and at room temperature - it had been sitting disconnected in my basement for the past couple weeks. If your battery manual doesn’t have a chart, use the relevant one listed above.įor example, I recently wanted to test the remaining capacity of a 12V 33Ah sealed lead acid battery I own. Then, simply use a multimeter to measure the voltage at the battery terminals and compare the number you get to the state of charge chart in your battery manual. (Battery University recommends at least 4 hours.) To properly estimate battery capacity based on open circuit voltage, first disconnect everything from your battery and let it rest at room temperature for several hours. 24V Lead Acid Battery Voltage Charts 24V Sealed Lead Acid Batteries (AGM & Gel) VoltageĬons: Must disconnect all loads and chargers and let battery rest for several hours Lithium iron phosphate (LiFePO4) batteries have become a lot more popular in recent years, though, in large part thanks to their dramatic price drops we’ve seen over the last decade.ġ2V sealed lead acid batteries are fully charged at around 12.89 volts and fully discharged at around 12.23 volts (assuming 50% max depth of discharge).ġ2V flooded lead acid batteries are fully charged at around 12.64 volts and fully discharged at around 12.07 volts (assuming 50% max depth of discharge). They are made by connecting six 2V lead acid cells in series.Īs far as I can tell, lead acid is still the most popular rechargeable battery type for DIY solar power systems. Many car and marine batteries are 12V lead acid batteries. They’re widely available and have a low upfront cost. 12V lead acid batteries are popular in solar power systems and other 12V electrical systems.
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