« Back to Battery 101

AGM battery charging

The first stage in a 3 or 4 stage charging algorithm is the Bulk Stage. Typically the Bulk Stage is a Constant Current (CC) charge but may also be Constant Power, Pulse Current or Taper Charge. In this stage the optimum charge current should be limited to less than or equal to 30 amps per 100 ampere hour (20 hour rate) of battery capacity or .3C. This stage should end when the cell voltage is = to 2.4-2.465V/Cell at 25°C/77°F. The maximum time in hours should = 1.2 times the DOD (in AH) divided by the average charge current in amps. If this time is exceeded, charging should be stopped and the battery and/or charge process should be analyzed. This stage will represent approximately 60% of the total charge time. The battery will be nearing 80%-90% charged at the end of this stage.

The second stage is the Absorption Stage. Typically this stage is a Constant Voltage (CV) stage where the terminal voltage is maintained at 2.4-2.465V/Cell at 25°C/77°F (adjusting for temperature). The charge current is maintained until current acceptance drops by less than .1 ampere over a 1 hour period. This stage should take the battery to 100% charged and should not take longer than 10-12 hours. If this time is exceeded, charging should be stopped and the battery and/or charge process should be analyzed.

The third stage is the Float Stage or maintenance and monitor stage. This step is generally not needed if; no load is present when the batteries device is not in operation; the batteries device is used on a regular basis and does not sit idle for lengthy periods of time. Float voltage should be maintained at 2.25-2.30 V/Cell.

If a Balance Mode is included in the charging algorithm it would typically happen after the Absorption Stage. This would become the third stage and the “Float Stage” would then become the fourth stage. A balance mode is similar to an Equalize function for flooded batteries but is performed against tightly controlled current, voltage and time. For example the current should be limited to 1 amp per 100 amp hour of battery capacity and the battery should not be maintained at the balance or over voltage limit for less than 1 hour and for no longer than 4 hours.

Warning: Do not equalize charge GEL or AGM batteries! 

General Lead Acid Battery Description
General Lead Acid Battery Applications
General Lead Acid Battery Types
General Lead Acid Battery Chemistry
Discover® Sealed Valve Regulated Lead Acid Batteries
Discover® Deep Cycle AGM Battery
Discover®700 Series Dry Cell Battery
Discover® EV Traction Dry Cell Battery
General Benefits and Features of Discover Valve Regulated Lead Acid (VRLA) Technology
Sales Channels for Discover Battery Technologies
Things to question when making a battery buying decision
What to consider when buying a deep cycle battery
Information gathering before buying batteries
Calculating cost to own when purchasing batteries
Safety First
Safety and Productivity
When working with batteries
When handling battery acid
When installing or replacing batteries
When booster cables are used
Danger of exploding batteries
Warning and warning labels
Parallel connections for sophisticated users and installers
Parallel connections for unsophisticated users and installers
Charging
When charging batteries
Selecting a charger
General charging information for AGM and GEL batteries
GEL battery charging
AGM battery charging
Equalizing (Flooded batteries only)
Discharging
Typical self-discharge of VRLA batteries at different temperatures
Typical self-discharge of high quality deep cycle flooded batteries at different temperatures
How much will a system cost for my 2000 square foot home?
Can I use all of my normal 120/240 VAC appliances?
What components do I need for a grid-tie system?
What components do I need for a complete solar system?
What type of solar module mounting structure should I use?
Where should I mount the solar modules and what direction should I face them?
Should I set my system’s battery bank up at 12, 24 or 48 VDC?
Should I wire my home for AC or DC loads?
Can I use PV to heat water or for space heating?
How do solar panels (cells) generate electricity?
Will solar work in my location?
Tables & Figures