BATTERY TEMP FLOAT VOLTAGE CHARTS NEEDED
FOR FLOODED LEAD ACID FOR RUN OF THE MILL AGM FOR LIFELINE one post three charts needs to be a STICKY por favor. Cannot do it with this cellular...
Forum Discussion
From Trojan Website.
Trojan FAQ
1. How does temperature affect the performance of my batteries?
At higher temperatures (above 80º F (27º C)) battery capacity generally increases, usually at the cost of battery life. Higher temperatures also increase the self-discharge characteristic. Colder temperatures (below 80º F (27º C)) will lower battery capacity and prolong battery life. Cooler temperatures will slow self-discharge. Therefore, operating batteries at temperatures at or slightly below 80º F (27º C) will optimize both performance and life.
2. How do I determine my battery capacity when it is colder/hotter?
Battery capacity is basically a linear relationship. A good rule of thumb is that for every 15º F (9º C) above 80º F (27º C), capacity is increased by 10% and for every 15º F (9º C) below 80º F (27º C), capacity is reduced by 10%.
3. How do I account for temperature when taking my gravity readings?
Temperature will affect specific gravity readings. As temperature increases, the electrolyte solution expands and as temperature decreases the electrolyte solution contracts. As a result, it is a good practice to temperature correct specific gravity readings. Here are the relationships Trojan recommends using: Every ten degrees above 80º F (27º C) add 4 points to the hydrometer reading.
Example: @ 90º F (32º C) the hydrometer reads: 1.250 the actual reading: 1.250 + .003 = 1.253.
For every ten degrees below 80º F (27º C) subtract 4 points from the hydrometer reading.
Example: @ 70º F (21º C) the hydrometer reads: 1.250 the actual reading: 1.250 – .003 = 1.247.
4. How much should I compensate the charge voltage for temperature?
Temperature will affect voltage readings. As temperature increases, voltage decreases. Conversely, as temperature decreases, voltage increases. Here are the relationships:
Trojan recommends using the following: For every 1º F below 77º F add 0.0028 volts per cell or for every 1 C below 25º C add 0.005 volts per cell to the charger voltage setting.
1: A 12 volt battery @ 70º F. The recommended charging voltage at 77º F is 14.8 volts. The adjusted charging voltage is 14.8 + (6 cells * 7 degrees below * 0.0028) = 14.92 volts.
2: A 12 volt battery @ 21º C. The recommended charging voltage at 25º C is 14.8 volts. The adjusted charging voltage is 14.8 + (6 cells * 4 degrees below * 0.005) = 14.92 volts.
For every 1º F above 77º F subtract 0.0028 volts per cell or for every 1º C above 25º C subtract 0.005 volts per cell to the charger voltage setting.
1: A 12 volt battery @ 85º F. The recommended charger voltage at 77º F is 14.8 volts. The adjusted charging voltage is 14.8 – (6 cells * 8 degrees above * 0.0028) = 14.67 volts.
2: A 12 volt battery @ 29.5º C. The recommended charger voltage at 25º C is 14.8 volts. The adjusted charging voltage is 14.8 – (6 cells * 4.5 degrees above * 0.005) = 14.67 volts.
Trojan FAQ
1. How does temperature affect the performance of my batteries?
At higher temperatures (above 80º F (27º C)) battery capacity generally increases, usually at the cost of battery life. Higher temperatures also increase the self-discharge characteristic. Colder temperatures (below 80º F (27º C)) will lower battery capacity and prolong battery life. Cooler temperatures will slow self-discharge. Therefore, operating batteries at temperatures at or slightly below 80º F (27º C) will optimize both performance and life.
2. How do I determine my battery capacity when it is colder/hotter?
Battery capacity is basically a linear relationship. A good rule of thumb is that for every 15º F (9º C) above 80º F (27º C), capacity is increased by 10% and for every 15º F (9º C) below 80º F (27º C), capacity is reduced by 10%.
3. How do I account for temperature when taking my gravity readings?
Temperature will affect specific gravity readings. As temperature increases, the electrolyte solution expands and as temperature decreases the electrolyte solution contracts. As a result, it is a good practice to temperature correct specific gravity readings. Here are the relationships Trojan recommends using: Every ten degrees above 80º F (27º C) add 4 points to the hydrometer reading.
Example: @ 90º F (32º C) the hydrometer reads: 1.250 the actual reading: 1.250 + .003 = 1.253.
For every ten degrees below 80º F (27º C) subtract 4 points from the hydrometer reading.
Example: @ 70º F (21º C) the hydrometer reads: 1.250 the actual reading: 1.250 – .003 = 1.247.
4. How much should I compensate the charge voltage for temperature?
Temperature will affect voltage readings. As temperature increases, voltage decreases. Conversely, as temperature decreases, voltage increases. Here are the relationships:
Trojan recommends using the following: For every 1º F below 77º F add 0.0028 volts per cell or for every 1 C below 25º C add 0.005 volts per cell to the charger voltage setting.
1: A 12 volt battery @ 70º F. The recommended charging voltage at 77º F is 14.8 volts. The adjusted charging voltage is 14.8 + (6 cells * 7 degrees below * 0.0028) = 14.92 volts.
2: A 12 volt battery @ 21º C. The recommended charging voltage at 25º C is 14.8 volts. The adjusted charging voltage is 14.8 + (6 cells * 4 degrees below * 0.005) = 14.92 volts.
For every 1º F above 77º F subtract 0.0028 volts per cell or for every 1º C above 25º C subtract 0.005 volts per cell to the charger voltage setting.
1: A 12 volt battery @ 85º F. The recommended charger voltage at 77º F is 14.8 volts. The adjusted charging voltage is 14.8 – (6 cells * 8 degrees above * 0.0028) = 14.67 volts.
2: A 12 volt battery @ 29.5º C. The recommended charger voltage at 25º C is 14.8 volts. The adjusted charging voltage is 14.8 – (6 cells * 4.5 degrees above * 0.005) = 14.67 volts.
