127 Victron Energy B.V. | De Paal 35 | 1351 JG Almere | The Netherlands General phone: +31 (0)36 535 97 00 | E-mail: sales@victronenergy.com www.victronenergy.com Victron Battery Balancer Input voltage range Up to 18V per battery, 36V total Turn on level 27,3V +/- 1% Turn off level 26,6V +/- 1% Current draw when off 0,7 mA Midpoint deviation to start balancing 50 mV Maximum balancing current 0,7A (when deviation > 100 mV) Alarm trigger level 200mV Alarm reset level 140 mV Alarm relay 60V / 1A normally open Alarm relay reset Two terminals to connect a push button Over temperature protection yes Operating temperature -30 to +50°C Humidity (non-condensing) 95% ENCLOSURE Colour Blue (RAL 5012) Connection terminals Screw terminals 6 mm² / AWG10 Protection category IP22 Weight 0,4 kg Dimensions (h x w x d) 100 x 113 x 47 mm STANDARDS Safety EN 60950, CSA/UL 62368-1 Emission EN 61000-6-3, EN 55014-1 Immunity EN 61000-6-2, EN 61000-6-1, EN 55014-2 Automotive Directive EN 50498 Installation 1) The Battery Balancer(s) must be installed on a well-ventilated vertical surface close to the batteries (but, due to possible corrosive gasses, not above the batteries!) 2) In case of series-parallel connection, the midpoint interconnecting cables must be sized to at least carry the current that arises when one battery becomes open-circuited. - In case of 2 parallel strings: cross section 50% of the series interconnecting cables. - In case of 3 parallel strings: cross section 33% of the series interconnecting cables, etc. 3) If required: first wire the alarm contact and the alarm reset. 4) Use at least 0,75 mm² to wire the negative, positive and midpoint connections (in this order). Additionally, if in your application it is needed to comply with UL, also fuse these wires near the batteries with a 10A fuse suitable for DC current (e.g. Littelfuse ATOF series automotive blade fuse in combination with an inline fuse holder). 5) The balancer is operational. When the voltage over a string of two batteries is less than 26,6V the balancer switches to standby and all LEDs will be off. When the voltage over a string of two batteries increases to more than 27,3V (during charging) the green LED will turn on, indicating that the balancer is on. When on, a voltage deviation of more than 50 mV will start the balancing process and at 100 mV one of the two orange LEDs will turn on. A deviation of more than 200 mV will trigger the alarm relay. What to do in case of an alarm during charging In case of a new battery bank the alarm is probably due to differences in initial state-of-charge. If the difference between the lowest and highest battery voltage reading is more than 0,9V: stop charging and charge the individual batteries or cells separately first, or reduce charge current substantially and allow the batteries to equalize over time. If the problem persists after several charge-discharge cycles: a) In case of series-parallel connection disconnect the midpoint parallel connection wiring and measure the individual midpoint voltages during absorption charge to isolate batteries or cells which need additional charging, or: b) Charge and then test all batteries or cells individually or: c) Connect two or more battery balancers in parallel (on average one balancer will take care of up to three parallel 200 Ah strings). In case of an older battery bank which has performed well in the past, the problem may be due to: d) Systematic undercharge: more frequent charging needed (VRLA batteries), or equalization charge needed (flooded deep cycle flat plate or OPzS batteries). Better and regular charging will solve the problem. e) One or more faulty cells: replace all batteries. Battery Balancer connected to six series-parallel connected 12V batteries (24V system) Three Battery Balancers connected to 12 series-parallel connected 12V batteries (48V system)
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