Fangpusun MPPT 75/05 Manual página 8

3.7 Battery charging information
The charge controller starts a new charge cycle every morning, when the sun starts shining.
The maximum duration of the absorption period is determined by the battery voltage
measured just before the solar charger starts up in the morning:
Battery voltage Vb (@start-up)
23,8V < Vb < 24,4V
24,4V < Vb < 25,2V
If the absorption period is interrupted due to a cloud or due to a power hungry load, the
absorption process will resume when absorption voltage is reached again later on the day,
until the absorption period has been completed.
The absorption period also ends when the output current of the solar charger drops to less
than 1Amp, not because of low solar array output but because the battery is fully charged
(tail current cut off).
This algorithm prevents over charge of the battery due to daily absorption charging when
the system operates without load or with a small load.
3.7.1. Automatic equalization
Automatic equalization is default set to 'OFF'. By using the configuration tool mpptprefs this
setting can be configured with a number between 1 (every day) and 250 (once every 250
days). When automatic equalization is active, the absorption charge will be followed by a
voltage limited constant current period. The current is limited to 8% of the bulk current for
the factory default battery type, and to 25% of the bulk current for a user defined battery
type. The bulk current is the rated charger current unless a lower maximum current setting
has been chosen.
When using the factory default battery type, automatic equalization ends when the voltage
limit 16.2V / 32.4V has been reached, or after t = (absorption time)/8, whichever comes first.
For the user defined battery type automatic equalization ends after t = (absorption time)/2.
When automatic equalisation is not completely finished within one day, it will not resume the
next day, the next equalisation session will take place as determined by the day interval.
3.8 VE.Direct communication port
Several parameters can be customized (VE.Direct to USB cable, ASS030530000, and a
computer needed). See the data communication white paper on our website.
The required software can be downloaded from
http://www.fangpusun.com
The charge controller can be connected the to a Color Control panel, BPP000300100R, with
a VE.Direct to VE.Direct cable.
6
Vb < 23,8V
Vb > 25,2V
(divide voltages by 2 for a 12V system)
Maximum absorption time
6h
4h
2h
1h