Vanner Vann-Guard 70-100 Battery Equalizer | 24V to 12V | 100 Amp | Transit Bus Coach Heavy Truck

Vanner VANN-Guard 70-100 Battery Equalizer — 24V to 12V DC, 100 Amp Output | Part 70-100 The Vanner VANN-Guard 70-100 is a heavy-duty battery equalizer designed to provide a reliable 12-volt DC power source from a 24-volt series-connected battery system. Rather than drawing current unequally from one battery as simpler methods do, the VANN-Guard connects to the 24V, 12V, and ground terminals of the battery array and ensures current is drawn equally from both batteries — keeping both battery voltages matched within 0.05V under light loads and 0.1V at full rated output. This equalization significantly extends battery service life while maintaining a stable 12V supply for vehicle accessories and equipment. Electrical Specifications Input Voltage (nominal 24V): 18–32 VDC | Max 24V Input Current: 53 Amps | Output Voltage: (Input Voltage ÷ 2) ±2% | Output Current (12 VDC): 0–100 Amps | Peak Efficiency: >97% | Standby Mode Current: 17 mA nominal at 28.4V Environmental & Physical Enclosure: Cast aluminum | Operating Temperature: -40°C to +95°C (-40°F to 203°F) | Storage Temperature: -54°C to +105°C (-65°F to 221°F) | Dimensions: 10.6"H × 8.5"W × 3.6"D | Weight: 9.1 lbs | Serviceable: Yes Mounting Should be mounted on a flat surface close to the batteries to allow short battery cable runs. Location should be shielded from continuous fluid exposure; splash and spill exposure is acceptable. Typical Applications Transit bus, private coach, tour/charter coach, heavy truck, fire apparatus, EMS vehicle, boat, off-highway equipment, solar and alternative energy systems. Paralleling Multiple 70-Series VANN-Guard units can be operated in parallel to deliver even higher output for fully loaded tour buses, large coach fleets, and high-demand alternative energy installations. Compatible with other Vanner VANN-Guard and Equalizer models when paralleling. Cross Reference Numbers Vanner 70-100 | VANN-Guard 70-100 | Havis 70-100 | Replaces earlier Vanner VANN-Guard 70-100 versions About the Brand Vanner has been delivering engineering excellence in power conversion and power management for commercial vehicles since 1977. The VANN-Guard product line is now produced and supported by Havis, Inc., which acquired the Vanner brand. The 70-Series VANN-Guard is the industry benchmark for battery equalization in dual-voltage fleet and transit applications worldwide.

• 24V TO 12V BATTERY EQUALIZER — 100 Amp | Accepts 18–32 VDC input and delivers 0–100 Amps at 12 VDC output; output voltage tracks at input voltage ÷ 2 (±2%) — providing a stable 12V power source from a 24V series battery system without a separate alternator or converter
• 97% PEAK EFFICIENCY — EXTENDS BATTERY LIFE — The VANN-Guard makes the two 12V batteries in a 24V series array behave as if they are in series and parallel simultaneously, keeping both batteries within 0.05V of each other under light loads and ensuring equal charge acceptance — significantly extending battery service life
• WIDE OPERATING TEMPERATURE RANGE — Rated for -40°C to +95°C (-40°F to 203°F), making it suitable for transit buses, private coaches, tour/charter coaches, heavy trucks, boats, fire apparatus, EMS vehicles, and solar/alternative energy systems in any climate
• CAST ALUMINUM ENCLOSURE — Rugged housing averts salt, dust, water, fuel vapors, and fluids associated with commercial and off-highway vehicle operations; units may also be paralleled for even higher output capacity on fully loaded vehicles and alternative energy systems
• FIELD SERVICEABLE — Dimensions: 10.6"H x 8.5"W x 3.6"D | Weight: 9.1 lbs | Max 24V input current: 53 Amps | Standby draw: 17mA nominal at 28.4V | See also: Compatible with Vanner 70-100M (monitor version), Vanner 70-100CAN (CAN version)