Abbildung Fronius Acctiva
Fronius Acctiva
Chargers for closed and sealed lead-acid batteries: Flooded, GEL, AGM

Fronius AcctivaUniversal professional charger

Charges starter batteries in professional applications with high efficiency. Supplies consumers and saves settings during updates and replacements. Suitable for all types of starter batteries.
Our recommendation for professional charging of starter batteries.


  • Acctiva Twin

    With 2 charging circuits especially suitable for emergency vehicles with starter and traction battery

    • Protection against thermal overload
  • Acctiva Flash 70A, Acctiva Prof 35, Acctiva Smart 25

    Robust, fully automatic workshop chargers for power supply during diagnosis and software updates. Protect on-board electronics and back up vehicle settings during battery changes. Powerful fast charging. Ensure the battery is fully charged and ready to start. For cars, trucks, buses, motorcycles, security vehicles, construction vehicles and agricultural machinery. Acctiva Flash 70A for 12-volt batteries only, Acctiva Prof 35 and Acctiva Smart 25 for 6-volt, 12-volt and 24-volt batteries. With desulphation mode, function test for flat batteries and regeneration mode for deeply discharged batteries. With display to show charging phase, state of charge and faults. USB interface for firmware updates. Acctiva Flash 70A with IP25, Acctiva Prof 35 with IP40 horizontal/IP44 vertical, Acctiva Smart 25 with IP40.
  • Acctiva Seller

    Charger for showroom, car demonstration, vehicle premieres, vehicle handover. Charges the starter battery and safeguards the state of charge of batteries by preventing charge/discharge cycles, protecting the battery. Protects the vehicle, the onboard electronics and the battery. Compact design and silent with no fan. With detachable cables to pass through the engine compartment and mount the charger out of sight. Secure against removal and theft with Kensington Lock. IP40 horizontal, IP44 vertical.


  • Fully automatic charger with advanced high-frequency technology.
  • Suitable for flooded starter batteries including calcium, hybrid, silver batteries also with 14.7 volt charge voltage, for sealed AGM, GEL, MF and SLA batteries as well as for start-stop batteries, both Enhanced Flooded Batteries (EFB) and AGM batteries.
  • Protection against: Reverse polarity, short circuit, overheating.
  • State of charge shown on the display.


Item nr. Volt Ampere Length mm Width mm Height mm
Fronius Acctiva ACCTIVA-TWIN


Connection voltage:230 V
Connection current:15 A
DC voltage:12/2x12/24 V
DC current:15 A
Size:247 x 162 x 88 mm
Weight:2 kg
Where can I
buy this?
Fronius Acctiva ACCTIVA-PROFESS-35


Connection voltage:230 V
Connection current:0 A - 35 A
DC voltage:6/12/24 V
DC current:0-35 A
Size:247 x 162 x 88 mm
Weight:2 kg
Where can I
buy this?


Connection voltage:230 V
Connection current:3 - 250 Ah, 2 - 25 A
DC voltage:6/12/24 V
DC current:0-25 A
Size:247 x 162 x 88 mm
Weight:2 kg
Where can I
buy this?


Connection voltage:230 V
Connection current:30 A
DC voltage:12 V
DC current:30 A
Size:247 x 162 x 88 mm
Weight:2 kg
Where can I
buy this?

Charger Knowledge

Continuous discharge test
Checking the battery step by step
There are many reasons for weakening or failing batteries. An important step in tracking them down is to measure the voltage with a battery tester. Here's how: 1. preparation Disconnect the battery from the vehicle, if possible remove it. Tips on how …
How does a charger work?
In principle, the charger reverses the chemical process that provides the current output in the charged battery. To do this, it provides the battery with voltage (in volts) and current (in amps). The charge controller in the charger decides how much current …
Which charger for which battery type?
The most important distinction is that sealed batteries and especially lithium batteries can react extremely to the heat and overpressure during overcharging. A reliable cut-off is particularly important here. Modern fully automatic electronic chargers …
Charging the vehicle battery now and then
User chargers or consumer chargers are particularly easy to use and easy to maintain. They allow quick charging in between or when the battery is stored for a longer period of time before it is used again, e.g. a starter battery in a classic car that …
AGM or GEL drive batteries
Drive batteries in AGM or GEL technology are sealed, absolutely maintenance-free, leak-proof batteries in a closed design with a fixed electrolyte (in fleece or gel). Both are suitable for medium to heavy cyclic use, for example in cleaning machines, …
Why is the charging voltage of the charger important?
In principle, when charging, the electrons within the battery move from one electrode to the other, in the opposite direction to when they draw current, i.e. discharge. If a discharged battery is provided with too high a voltage from the current or voltage …
Batteries without vent hose
Only conventional, wet batteries need a vent hose, because they gas strongly during operation. The resulting steam can escape through the openings in the plugs. To prevent the vapour from damaging the vehicle, conventional batteries are vented to the …
When is a multi-voltage charger worthwhile?
Electronic chargers can support different voltages. Depending on whether you only want to charge a car starter battery or also a scooter, motorhome supply battery or drive battery for small vehicles or industrial trucks, it may be worth reaching for a …
Chargers in a workshop
Especially for workshops, there is another charger that supplies the vehicle with power during diagnoses and software updates on the vehicle electronics. During this phase, the vehicle management system requires a particularly large amount of power and …
Cleanliness pays off
To ensure proper battery function, it makes sense to keep the battery surface clean and dry. Greasy or silicone-containing dirt on the lid can hinder the flow of current. Moisture on the battery can cause a short circuit in the worst case.