Xantrex Technology RS2000 manual Bulk Charge, Absorption Charge

Battery Charging Reference

There is a fourth stage, equalization, which is initialized manually as it is only performed occasionally and only on flooded (or wet) batteries.

Bulk Charge

In the first stage—the bulk charge—RS2000 delivers its full-rated output current. This constant current is delivered to the batteries until the battery voltage approaches its gassing voltage—typically around 13.5 volts for 12 volt batteries. The bulk charge stage restores about 75% of the battery’s charge.

The exit from bulk stage to the next stage, absorption, occurs under the following condition:

•battery voltage is more than the gassing voltage (VG) for a specified amount of time (3 minute default).

With an AC reconnect to qualified AC from the utility power or a generator during the bulk stage, the unit will return to the bulk stage. See “AC Reconnect Summary” on page B–7.

Absorption Charge

During the first part of absorption charge, the RS2000 delivers its full rated output current until the absorption voltage is reached. At this point, the RS2000 will transition to a constant voltage mode by keeping the charge voltage constant at the absorption voltage level, and the battery gradually reduces the charging current it demands as the battery attains full charge.

The absorption stage has the following exit criteria:

•Overall time in absorption timeout (∆TA) has a default of 6 hours.

•Time in constant voltage absorption timeout (∆TCV) has a default of 1 hour.

•Charge current level drops below a specified limit (IH) for a specified amount of time, which has a default of 2% of C in Ah for 3 minutes.

See “Charge Algorithm Definitions” on page B–6for more information.

With an AC reconnect during the absorption stage, the unit will transition to the float stage for three-stage charging and no-float stage for two-stage charging. See “AC Reconnect Summary” on page B–7.

975-0125-01-01 B–3