Battery Chargers

Victron Skylla-i 24V Battery Charger

The Victron Skylla-i is a 24V battery charger for installations where one charger needs to manage more than one battery bank. It runs a 7-stage adaptive charge algorithm for lead-acid batteries and supports Li-Ion (LiFePO4) banks through BMS on-off control or full voltage and current control over its galvanically isolated CAN bus port. The serie...

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The Victron Skylla-i is a 24V battery charger for installations where one charger needs to manage more than one battery bank. It runs a 7-stage adaptive charge algorithm for lead-acid batteries and supports Li-Ion (LiFePO4) banks through BMS on-off control or full voltage and current control over its galvanically isolated CAN bus port.

The series comes in 80A and 100A ratings, each in two output configurations. The (1+1) models charge a main bank and top up a separate starter battery from a second output limited to approximately 4A. The (3) models have three isolated outputs that can each deliver the full rated current, with total output capped at 80A or 100A. The 24/80 models suit 400–800Ah battery banks and the 24/100 models suit 500–1,000Ah.

For lead-acid banks, the Victron Skylla-i uses variable absorption time, BatterySafe mode and Storage mode to limit overcharging, gassing and sulphation. The included battery temperature sensor and voltage sense keep charge voltage accurate as temperature and cable losses change.

The charger runs from New Zealand 230Vac mains or from a DC supply, and its stabilised output means it can also serve as a power supply where batteries or large buffer capacitors aren't available.

An aluminium epoxy powder-coated case with drip shield, stainless steel fixings and acrylic-coated circuit boards withstands heat, humidity and salt air. Internal temperature sensors reduce output current automatically under extreme conditions to keep power components within their limits.

Typical applications include commercial and recreational vessels, where the NMEA2000 interface and corrosion-resistant construction suit onboard systems charged from shore power or a generator, along with vehicle, off-grid and industrial standby systems that rely on more than one battery bank.

Several Victron Skylla-i chargers can be synchronised in parallel over VE.Can with RJ45 UTP cables for higher total charge current, although (1+1) and (3) models can't be paralleled with each other. The Skylla-i Control panel adds remote monitoring and input current limiting for systems running from limited shore power or small generators, and the BMV-700 battery monitor tracks state of charge across the bank.

Powerbox Pacific's engineering team can help with charger selection, battery bank sizing and parallel system configuration. Browse our battery chargers or the full Victron Energy range.

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Features
  • Two Output Configurations: Available as the Skylla-i (1+1) with two isolated outputs for topping up a starter battery (second output limited to approximately 4A), or the Skylla-i (3) with three full-current isolated outputs for charging three separate battery banks.
  • Li-Ion (LiFePO4) Ready: Simple on-off charger control via a relay or open collector optocoupler from a Li-Ion BMS, or complete voltage and current control through the galvanically isolated CAN bus port.
  • Synchronised Parallel Operation: Multiple chargers can be synchronised via the CAN bus interface using RJ45 UTP cables; two-output and three-output chargers cannot be paralleled with each other.
  • BatterySafe Mode: Automatically limits the rate of voltage increase once the gassing voltage is reached, preventing damage from excessive gassing during high current, high absorption voltage charging.
  • Storage Mode: Reduces float voltage to 2.2V/cell (26.4V for a 24V battery) after 24 hours without discharge, refreshing to absorption level weekly to prevent stratification and sulphation.
  • Variable Absorption Time: Keeps absorption short after shallow discharges to prevent overcharging, and extends it automatically after a deep discharge so the battery is fully recharged.
  • Temperature Compensation & Battery Voltage Sense: A battery temperature sensor automatically reduces charge voltage as battery temperature rises, while voltage sense compensates for cable resistance.
  • Rugged Construction: Aluminium epoxy powder coated case with drip shield and stainless steel fixings, acrylic-coated circuit boards, and temperature sensors that reduce output current under extreme conditions.
  • Flexible Configuration: A CAN bus (NMEA2000) interface, rotary switch, DIP switches and potentiometers allow the charge algorithm to be adapted to the connected battery.
  • AC or DC Supply: Accepts 185–265Vac or 180–350Vdc input, and the stabilised output allows use as a power supply where batteries or large buffer capacitors aren't available.
Specifications
Skylla-i
Model 24/80 (1+1) 24/80 (3) 24/100 (1+1) 24/100 (3)
Input voltage (Vac) 230V
Input voltage range (Vac) 185–265
Input voltage range (Vdc) 180–350
Maximum AC input current @ 180Vac 16A 20A
Frequency (Hz) 45–65
Power factor 0.98
Charge voltage 'absorption' (Vdc)(1) 28.8
Charge voltage 'float' (Vdc) 27.6
Charge voltage 'storage' (Vdc) 26.4
Charge current (A)(2) 80A 3 x 80A (max total output: 80A) 100A 3 x 100A (max total output: 100A)
Charge current starter batt. (A) 4A n. a. 4A n. a.
Charge algorithm 7 stage adaptive
Battery capacity (Ah) 400–800Ah 500–1,000Ah
Charge algorithm, Li-Ion 3 stage, with on-off control or CAN bus control
Temperature sensor Yes
Can be used as power supply Yes
Remote on-off port Yes (can be connected to a Li-Ion BMS)
VE.Can communication port(3) Two RJ45 connectors, NMEA2000 protocol, galvanically isolated.
Integrated 12V CAN-bus power supply, 30Vdc maximum
Synchronised parallel operation Yes, with VE.Can
Alarm relay DPST
AC rating: 240Vac/4A
DC rating: 4A up to 35Vdc, 1A up to 60Vdc
Forced cooling Yes
Protection Battery reverse polarity (fuse)
Output short circuit
Over temperature
Operating temp. range -20 to 60°C (Full output current up to 40°C)
Humidity (non-condensing) max 95%
(1) Output voltage range 20–36V. Can be set with rotary switch or potentiometers.
(2) Up to 40°C (100°F) ambient. Output will reduce to 80% at 50°C, and to 60% at 60°C.
(3) When connecting the Skylla-i in a VE.Can network that also contains devices connected to a 48V battery bank, make sure to use a special RJ-45 cable, which has pins 2 and 6 (NET-S / V+) not connected.
ENCLOSURE
Model 24/80 (1+1) 24/80 (3) 24/100 (1+1) 24/100 (3)
Material & Colour aluminium (blue RAL 5012)
Battery-connection M8 bolts
230Vac connection screw-clamp 10mm² (AWG 7)
Protection category IP21
Weight kg (lbs) 7kg (16 lbs)
Dimensions hxwxd in mm (hxwxd in inches) 405 x 250 x 150 (16.0 x 9.9 x 5.9)
STANDARDS
Model 24/80 (1+1) 24/80 (3) 24/100 (1+1) 24/100 (3)
Safety EN 60335-1, EN 60335-2-29
Emission EN 55014-1, EN 61000-6-3, EN 61000-3-2
Immunity EN 55014-2, EN 61000-6-1, EN 61000-6-2, EN 61000-3-3
Selection Table
MODEL DESCRIPTION BATTERY VOLTAGE CHARGE CURRENT INPUT VOLTAGE RANGE
Skylla-i 24/80 (1+1) 24V 80A 185–265Vac
Skylla-i 24/80 (3) 24V 3 x 80A (max total 80A) 185–265Vac
Skylla-i 24/100 (1+1) 24V 100A 185–265Vac
Skylla-i 24/100 (3) 24V 3 x 100A (max total 100A) 185–265Vac
Downloads
victron-skylla-i-24v-battery-charger-datasheet.pdf
victron-skylla-i-remote-on-off-cable-specifications.pdf
victron-skylla-i-control-gx-panel-manual.pdf
victron-skylla-i-battery-charger-manual.pdf
victron-canusb-ve-can-to-usb-interface-manual.pdf
Warranty & Returns

Warranty periods vary by product. Please refer to the Powerbox Warranty Policy for the applicable coverage period against manufacturing defects from date of purchase. For returns and RMA requests, please visit our RMA support page or contact our support team directly.

FAQs
The Skylla-i (1+1) has two isolated outputs, with the second output limited to approximately 4A and a slightly lower voltage for topping up a starter battery. The Skylla-i (3) has three isolated outputs, all capable of supplying the full rated charge current, for charging three separate battery banks. Two-output and three-output chargers cannot be synchronised in parallel with each other.
The Skylla-i 24/80 delivers 80A (or 3 x 80A on the (3) model, max total output 80A) and suits 400–800Ah battery banks; the Skylla-i 24/100 delivers 100A (or 3 x 100A on the (3) model, max total output 100A) and suits 500–1,000Ah battery banks.
Yes. Simple on-off charger control can be implemented via a relay or open collector optocoupler output from a Li-Ion BMS connected to the remote control port, or complete voltage and current control can be achieved through the galvanically isolated CAN bus port.
Yes, via the CAN bus interface using RJ45 UTP cables. Two-output (1+1) and three-output (3) chargers cannot be paralleled with each other.
BatterySafe mode automatically limits the rate of voltage increase once the gassing voltage is reached, preventing damage from excessive gassing. Storage mode reduces float voltage after 24 hours without discharge to minimise gassing and corrosion, refreshing weekly to prevent stratification and sulphation. The charger also includes battery reverse polarity protection (fuse), output short circuit protection, and over-temperature protection.
It complies with EN 60335-1 and EN 60335-2-29 for safety, EN 55014-1, EN 61000-6-3 and EN 61000-3-2 for emission, and EN 55014-2, EN 61000-6-1, EN 61000-6-2 and EN 61000-3-3 for immunity.
Yes. Its stabilised output voltage allows the Skylla-i to be used as a power supply when batteries or large buffer capacitors aren't available. It also accepts both AC and DC input supply.
The Skylla-i operates from -20°C to 60°C, with full output current available up to 40°C ambient (reducing to 80% at 50°C and 60% at 60°C). It has an IP21 protection rating, an aluminium epoxy powder coated case, and is rated for humidity up to 95% (non-condensing).