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