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If I were to connect a solar panel and start solar charging the battery, voltage would change again.Ĭhecking battery capacity this way is convenient. If you use your charge controller’s voltage measurement to check LiFePO4 battery capacity, you can be way off!Īfter all, voltage drops under load. But the charge controller measured a battery voltage of 13.0 volts - roughly 30% state of charge. I measured a battery voltage of 13.23 volts with my multimeter - roughly 80% state of charge.
That correlates to a roughly 30% state of charge - a difference of 50%! That correlates to a roughly 80% state of charge.īut when I connected my battery to a solar charge controller, the controller measured 13.0 volts.
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It suffers from all of the problems mentioned above, plus it’s done while the battery is connected to loads and chargers.įor example, recall that when I checked my battery’s voltage with a multimeter at the battery terminals, I got a voltage reading of 13.23 volts.
This voltage reading is usually very inaccurate. I can just use it to check battery capacity.” “My solar charge controller already measures battery voltage.
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Some connect via Bluetooth to your phone so you can check your LiFePO4 battery’s capacity in a mobile app. They also display useful system specs such as battery voltage and current. The best way to track battery capacity is to connect a good battery monitor - such as the Victron SmartShunt or Victron BMV-712.īattery monitors track the amount of amp hours consumed to accurately estimate the state of charge. Use a Battery MonitorĬons: Good battery monitors are expensive
Measuring voltage is also a good way to check it a lithium battery is dead or not. When it arrived, I pulled it out of the box and immediately measured its voltage with a multimeter. Use it to get a rough estimate of your battery’s remaining capacity.įor example, I recently bought the Ampere Time 12V 100Ah LiFePO4 Deep Cycle Battery. (Don’t forget to disconnect your solar panels from your charge controller first!) Let the battery rest for a little while - I usually wait 15 minutes - and then measure its voltage with a multimeter.Ĭompare your measurement to the right voltage curve above, or the state of charge chart in your battery manual. To get an even somewhat accurate estimate based on voltage, you first need to disconnect any loads and chargers from the battery. Because of these factors, it can be hard to estimate their state of charge from voltage alone. Plus, LiFePO4 batteries have a relatively flat discharge curve from around 99% to 20% capacity. Measure Battery Voltage with a MultimeterĬons: Must disconnect all loads and chargers and let battery restīattery voltage changes depending on charge and discharge rates. 3 Ways to Check LiFePO4 Battery Capacity 1.
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You can connect cells in series and parallel to make LFP batteries with your desired voltage and capacity combinations. They’re best used for making your own lithium batteries. You can buy individual LiFePO4 cells online, though they’re harder to find than 12/24/48V LiFePO4 batteries. They are fully charged at 3.65 volts and fully discharged at 2.5 volts. Individual LiFePO4 cells have a nominal voltage of 3.2 volts.
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