For example, a 100 Ah battery will deliver 5A for 20 Hours. 10.5V for 12V battery, 21V for 24V battery and 42V for a 48V battery. The rated capacity in Ah in this example will be the number of Amperes of current the battery can deliver for 20 Hours at 80✯ (26.7✬) till the voltage drops to 1.75V / Cell. The voltage at the terminals is highest at the beginning of a discharge cycle and gradually falls.Īs a benchmark, the battery industry usually rates batteries at a “Discharge Rate” C/20 Amperes corresponding to 20 Hour discharge period. The Capacity in Ah relates to the ability of the battery to provide a constant specified value of discharge current over a specified time in hours before the battery reaches a specified discharged terminal voltage at a specified temperature of the electrolyte. An Ampere is the unit of measurement for electrical current and means a Coulomb of charge passing through an electrical conductor in one second. Rated Solar Batteries Capacity in Ampere-hour (Ah)īattery capacity is the measurement of electrical storage and is often expressed in Ampere-hours (Ah) but also can be expressed in watt-hours (Wh). Is higher than 2,000 watts, we strongly recommend you employ a 48 volt solar battery bank. (IE: 8 - 6V batteries = 48V battery bank) Your equipment will run cooler which means a longer life for things like refrigerator condensers etc. Whenever possible, use a higher voltage batteryīank such as 48V over 24V battery banks. If this were a 12V system, it would be 800Ah/day.If this were a 24V system, it would be 400Ah/day.Round up to 200Ah - This example system will use about 200Ah from the 48V solar batteries bank, on average, each day.To convert Wh to Ah, divide WH by the battery voltage 9500Wh/day ÷ 48VDC = 197.9Ah/day.Solar Batteries are rated in Amp-Hours (Ah).Neither condition is good for solar battery life expectancy. But with more than 3 strings it’s inevitable that some strings will end up doing all the work,Īnd some will do next to nothing. With 2 or 3 strings battery string imbalances can usually be kept within control. Will always try to take the route of least resistance.

More than 3 strings is just BEGGING for trouble! Tiny resistance differences between strings are unavoidable, and electrons being the supremely lazy things they are Multiple parallel battery strings are only good up to a certain point.ġ string is ideal.

Solar lithium battery