Accu Equalizer / Battery Balancer   

// VvE Vogelpark Heemstede RDL appartments
// Serial Accu Equlizer Nood stroom UPS accu's
//   main light, videofoon, frontdoor power building 2,3,4 and garage.
//
//    The UPS runs on 24 Volts dc by 2 small internal 12 V accu's in serie,
//    and 2 large external accu's in serie.
// Check 12v accu's for eaqual voltage and correct if not,
//   by proportional ballasing the accu with higher voltage.
//     
// By  Douwe Jippes  d.jippes@hccnet.nl  
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Total Voltage , current , chip temp , (Charg/ Nood).
UPS Internal higher accu Voltage , External accu , ballastin value
UPS Internal lower accu Voltage , External accu , Ballasting value





Microchip's MPLAB IDE v8.91  pic16f1825 code.
ser-accu-equel-2.c
LCD main.c

EAGLE 6.1.0 Graphical Layout Editor
5 Boards besteld bij: "ALLPCB" 1 Euro per stuk verzenden 19 Euro



Parts to be assembled  on boards made by ALLPCB.


Testing and Calibration:


Front panel showing: leds red internal, green ballasting upper or lower, red external accu, scoop PWM ballasting

In function on UPS and accu's


Led indicator explanation: all OK,   accu high voltage,    accu  low voltage, 
  during emergency accu low voltage.


Main board:


Front board:


Software:
Serial accu equal .c
Serial adapter LCD

Commercial availabl unit for 2 accus:  Accu Equalizer / Balancer