Victron Energy Battery Balancer, For 24V Systems, 0.7A Balancing Current

Overview

The Victron Energy BBA000100100 is a Battery Balancer for two 12V batteries connected in series, or for several parallel strings of series-connected 12V batteries in a larger bank. It helps keep the two battery halves at the same state of charge, which matters on boats with 24V DC systems where one battery can otherwise end up working harder than the other during charging and use.

When the charge voltage of a 24V battery system rises above 27.3V, the unit turns on and compares the voltage across the two batteries. Balancing starts from a 50 mV midpoint deviation, with up to 0.7A of balancing current when the deviation is above 100 mV. For 48V banks, three Battery Balancers can be used across the series-connected batteries.

The housing is rated IP22, so it belongs in a dry, protected electrical space rather than an exposed cockpit, wet bilge, or washdown area. Its compact 100 x 113 x 47 mm size makes it practical for mounting near a house battery bank, equipment locker, or DC distribution area where the wiring can stay short and service access remains clear.

Key features

• Balances two series-connected 12V batteries in a 24V bank, or parallel strings of series-connected batteries.
• Turns on during charging when system voltage rises above 27.3V and begins balancing from a 50 mV midpoint deviation.
• Draws up to 0.7A from the higher-voltage battery side to help the bank return toward an even state of charge.
• Supports 48V battery banks when three Battery Balancers are installed across the series-connected batteries.
• LED status indicators show power, upper or lower battery leg balancing activity, and alarm condition.
• Normally open 60V / 1A alarm relay can be tied into a remote alert or monitoring circuit.
• Screw terminals accept up to 6 mm² / AWG10 conductors, with separate terminals available for alarm reset.
• Operating temperature range of -30°C to +50°C suits protected marine electrical spaces that see seasonal temperature swings.
• IP22 enclosure is suitable for dry mounting locations where the unit is protected from spray and direct water exposure.

Installation and setup

Mount the balancer on a well-ventilated vertical surface close to the batteries, but not directly above them where corrosive battery gases may rise. On a boat, a protected battery compartment wall or nearby electrical panel backing board is usually a better location than the top of the battery box.

For the main negative, positive, and midpoint connections, use at least 0.75 mm² wiring and keep the runs neat, supported, and protected from chafe. In installations that need UL compliance, each of these wires should be fused near the batteries with a 10A fuse suitable for DC current.

Electrical and system integration

The Battery Balancer is most useful on 24V and 48V battery banks built from 12V batteries in series. It is not a solar charge controller and does not replace correct charging settings, proper battery matching, or routine battery maintenance. Its job is to manage midpoint imbalance while the bank is charging.

The alarm relay closes when the midpoint deviation reaches the alarm level, giving installers a clean way to add a remote warning light, buzzer, or monitoring input. The relay resets once the deviation drops back within range, and a separate push-button reset can be wired to the reset terminals when a manual reset point is useful at the DC panel.

Use cases on board

This unit is a good match for boats running a 24V house bank, inverter bank, or other series-connected battery setup where long battery life depends on keeping the two sides of the bank balanced. It is especially relevant for vessels that spend time on shore power, solar charging, alternator charging, or generator charging where repeated charge cycles can expose small differences between batteries.

For cruising boats, workboats, and fishing boats with higher-capacity DC systems, the balancer gives a simple way to reduce uneven charging stress without adding a complex control interface. It works quietly in the background once installed and gives clear LED feedback when balancing or alarm conditions occur.

Maintenance and care

Keep the unit dry, clean, and accessible for inspection. During routine battery checks, confirm that the terminals remain tight, wiring is supported, and the enclosure has not been exposed to water, salt residue, or corrosive fumes.

If an alarm appears on a new battery bank, the batteries may have started with different states of charge and may need to be charged individually before the system is put back into normal service. On an older bank, repeated alarms can point to undercharging, cell problems, or batteries that no longer age evenly.

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Returns may be requested within 30 days of receiving your order. Items must be unused, uninstalled, unaltered, and returned in their original packaging with all tags, packing materials, blank warranty cards, manuals, instructions, accessories, and included items. Certain products, including installed or used electronics, electrical components, lighting, consumables, custom or special-order items, cut-to-length products, safety equipment, and merchandise exposed to water or marine conditions, may not be eligible for return.

To request a return, sign in to your account and select the applicable order and items, and submit your request for review. Eligible unfulfilled items may also be submitted for cancellation within 1 hour of placing the order. Returns or cancellations are not considered approved until you receive confirmation from Apollo Lighting. Please do not ship or drop off merchandise before receiving return approval and instructions.

Customers are responsible for arranging and paying for return shipping unless the return is due to an error by Apollo Lighting or the item is verified as defective, damaged, or incorrect. Missing, damaged, defective, or incorrect items must be reported within 2 business days of delivery, and photos or other documentation may be required for review. If the issue is verified, Apollo Lighting may provide or reimburse return shipping and issue a replacement or refund depending on the circumstances. International customers are responsible for return shipping, duties, taxes, customs charges, brokerage fees, and other costs associated with an international return.

After your return is received and inspected, approved refunds are issued to the original payment method and may take 5-7 business days to appear after processing. Original shipping and handling charges are nonrefundable, and the value of any included free items that are not returned may be deducted from the refund. Apollo Lighting does not charge a standard restocking fee on eligible returns. Returns that are incomplete, damaged, installed, used, altered, improperly packaged, or otherwise do not meet the eligibility requirements may be refused. We recommend using a trackable and appropriately insured shipping service for all customer-arranged returns.

For assistance, contact info@apollolighting.com or call +1 (954) 375-0100.

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Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

Keep your receipt, product documentation, serial number information, and original packaging when practical. Damage caused by normal wear, misuse, improper installation, insufficient maintenance, corrosion, impact, unauthorized modifications, electrical issues, or operation outside the manufacturer's specifications may not be covered. Warranty claims are separate from standard returns, so a product that has been installed, used, or exposed to marine conditions may no longer qualify for return while still remaining eligible for evaluation under the manufacturer's applicable warranty.

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