![]() Battery life is reduced at higher temperatures – for every 15 degrees F over 77, battery life is cut in half. ![]() Battery capacity is reduced by 50% at -22 degrees F – but battery LIFE increases by about 60%. Battery life reduces at higher temperaturesĮven though battery capacity at high temperatures is higher, battery life is shortened. The sensor will then read very close to the actual internal battery temperature. For this reason, external (add-on) temperature sensors should be attached to one of the POSITIVE plate terminals, and bundled up a little with some type of insulation on the terminal. A large insulated battery bank may vary as little as 10 degrees over 24 hours internally, even though the air temperature varies from 20 to 70 degrees. Thermal mass means that because they have so much mass, they will change internal temperature much slower than the surrounding air temperature. This is why you should have temperature compensation on your lead-acid battery charger or charge control if your batteries are outside and/or subject to wide temperature variations. It will vary from about 2.74 volts per cell (16.4 volts) at -40 C to 2.3 volts per cell (13.8 volts) at 50 C. Wide temperature variationsīattery charging voltage also changes with temperature. Capacity is increased at higher temperatures – at 122 degrees F, battery capacity would be about 12% higher. At approximately -22 degrees F (-30 C), battery Ah capacity drops to 50%. The standard rating for batteries is at room temperature 25 degrees C (about 77 F). If your batteries spend part of the year shivering in the cold, the reduced capacity has to be taken into account when sizing the system batteries. This is why your car battery dies on a cold winter morning, even though it worked fine the previous afternoon. ![]() Battery capacity (how many amp-hours it can hold) is reduced as temperature goes down, and increased as temperature goes up. ![]()
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