DISCOVER DRY CELL Operating Manual - Page 7

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4.1 Charging

4.1.1 Charge Curve

A battery charge profile (also known as an algorithm) contains all of the logic used to execute a multi-stage charging

process, including the bulk, absorption and float phases. Charge profiles differ depending on the battery type, capacity,

battery manufacturer, and even the application. It is extremely vital that a battery is charged with an appropriate charge

profile. Not doing so, may cause the battery pack to be chronically under- or over- charged, resulting irreversible damage

and premature end-of-life.

The Bulk charge accounts for charging the battery from anywhere between 0% up to 80% state of charge. The absorption phase

charges the battery from 80% to nearly 100% state of charge. Lastly, a float charge supplies a controlled voltage and amperage

to bring the battery to a complete full charge. Without a float charge, recharge can be terminated based on time (this will need to

be determined as it will vary with depth of discharge and charge current) or percentage recharge (105%-108%).

To maximize battery life, a voltage regulated charger with temperature compensation is strongly recommended. The

voltage settings displayed in charge algorithm graph and charge setting tables, corresponds to the set points at 25°C

(77°F). For temperatures below 25°C, adjust +0.005VPC/°C (or 0.003VPC per °F). For temperatures above 25°C, adjust

-0.005VPC/°C (or 0.003VPC per °F). As the temperature decreases, the voltage should increase and vice versa.

If the charger has a preset charge profile for AGM type batteries, verify that these settings follow recommended charge

settings.

▲ CAUTION!

Always make sure the charger is in the correct setting and

compatible with the battery's charging requirements; never

charge a visibly damaged battery; never charge a frozen battery.

Acceptable charging AC ripple voltages shall be less than 4%

peak to peak ripple voltage (less than 1.5% rms voltage) of the

DC System voltage with duration of less than 6 milliseconds.

▲ WARNING!

Do not equalize charge DRY CELL Solar batteries! Equalizing is

an "over voltage-over charge" performed on flooded leadacid

batteries after they have been fully charged.

∆V=(T-25°C) x (

If a temperature sensor is not used, you must manually

adjust charging voltages based on the battery temperature

when in use.

▲ NOTE!

-0.005VPC

)

°C

▲ NOTE!

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