With your multi-meter, measure the voltage across the batterys two terminals.
12 volt battery meter pro#
The Xantrex XBM, Lite & PRO models DOES NOT HAVE THIS ISSUE. BMV 600S Battery Monitor Calculates ampere-hours consumed and the state of charge of a battery BMV-600S comes with shunt, 10 meter RJ 12. If the battery is not new, it should be charged with a battery charger and then left to sit for several hours to eliminate surface charge. How have they determined this - because the battery monitor that they are using says the batteries are still flat. This becomes evident after a number of discharge / recharge cycles, and as the company supplying the battery chargers to many of these customers, there is nothing more frustrating to be told the battery charger is not working. Technically this is called Peukerts Exponent, but in basic words, the meter is not using the incoming charge current to accurately recalculate the battery state of charge. nearly all of the other battery monitors on the market loose their calibration with alternator charging (i.e in boats where engines are not run for a long period of time), and the meter does not recognise correctly the incoming charge cuffenr. There are a number of battery monitors on the market today, However.
12 volt battery meter software#
By using High performance measuring circuits, along with complex software algorithms, you can exactly determine the remaining battery capacity.
12 volt battery meter code#
I modified for reference measurement this code as well: int value Serial.print("Battery level : ") Serial.println(percentage) // with regression func. Serial.print("Batery voltage: : ") Serial.println(batVoltage) īyte percentage = 100 * (batVoltage - BatVoltMin) / (BatVoltMax - BatVoltMin) //to be replaced Unsigned int batVoltage = adcValue * BatRatio / BatResolution Unsigned int adcValue = analogRead(BatVoltPin) // read the divided battery voltage on analog pin # 0ĪnalogReference(DEFAULT) // set back the reference voltage level to normal 5Vįor (int i=0 i<8 i++) analogRead(BatVoltPin) // so later in the main/full program no trouble after initiating 'analogReference(INTERNAL2V56) ' and change here.Ĭonst unsigned long BatResolution = 1024 Ĭonst unsigned long BatRatio = ((BatRs + BatRs) * BatVref) / BatRs ĪnalogReference(INTERNAL2V56) // set the reference voltage level from 5V to 2.56Vįor (int i=0 i<8 i++) analogRead(BatVoltPin) // just burn some ADC readings after reference change
void loop() // as long as they have the same unitĬonst unsigned long BatVref = 2560 //mV this must be measured on the AREF pin accurately with DMM Goal: measure the battery charged state in % as accurate as possible.įor this purpose I'm planning a voltage divider and use the internal reference voltage for accurate measuring. 12.8 V charging voltage and 10.7 V cut-off, connected to MEGA Vin pin. So I have a 4 cell LiFePO4 battery with max. I was searching for hours for proper solution and finally decided to make my version and post here.īefore blowing up my board, I would highly appreciate, if somebody can spend some time and check the goodness of the below code and schematic:
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