Battery Storage Knowledge Bank

Victron Storage Systems (Victron ESS)

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About Victron

Victron Energy has been supplying off-grid and on-grid battery storage systems for use in automotive, marine, industrial and solar applications for over 50 years.

Victron manufactures inverters, battery chargers, inverter/chargers, batteries, battery monitoring systems and switchgear, and is known for technical innovation, reliability and build quality. Its products allow complete flexibility in design and are widely considered to be a reliable professional choice for the management of independent electric power.

Victron Energy is a Dutch company. However it offers full technical support in the UK.

Victron vs Other Battery Storage Systems

Here are some of the reasons why we recommend Victron for certain projects:

  • Total flexibility in design, including choice/combination of DC and AC connection of solar PV, potential to include a back up generator as well as grid power in the same system, compatibility with different batteries and battery chemistries;
  • modular and scalable - up to 150kW / 270kWh on a three phase connection;
  • superior end-user and installer monitoring, managing and support;
  • very good for three phase (400V) grid connections allowing back-up on all three phases, which is not within the capability of other domestic / small-scale systems;
  • very good off-grid system;
  • UPS backup (i.e. uninterrupted power supply with less than 20ms cut-off);
  • Options for small or non-standard installations.

Grid-connected systems (Victron ESS)

Victron systems work well for grid-tied applications, using their ESS operation mode. An energy storage system (ESS) is used to store excess solar power in a battery for later usage on site, backup a property in the event of a power cut, and time-shift usage outside peak grid hours. 

Victron has an additional (and optional) feature, unique to their design called BatteryLife, which optimises the operation of battery operation to preserve battery life. 

Note that the Quattro allows the connection of both a generator and the grid - a feature which is not available with most battery storage systems, but which may turn out to be very useful if power shortages become part of our lives in the years to come.

For the Victron ESS with solar PV, you need:

  • Inverter/charger from the MultiPlus range (3kVA & 5kVA) or Quattro range (8 kVA, 10kVA, 15kVA) .
  • GX device (for system management and monitoring e.g. Cerbo), plus GX-Touch if you want an on site touchscreen display.
  • Battery (Victron or compatible third party e.g. BYD or Pylontech).

Victron ESS systems can be configured for full or partial backup depending on requirements.

Full backup schematic:

Victron full backup schematic

Partial backup schematic (with energy meter):

Victron partial backup schematic

In the event of a power cut, the Victron inverter-charger can continue to power loads on its output. The changeover happens so fast (less than 20ms) that even sensitive electronic loads will continue to function without interruption. This is a key benefit of Victron systems compared with other systems (such as Tesla Powerwall) which can take a few seconds to changeover.

Our go-to batteries for Victron ESS systems are those manufactured by BYD.  We typically use the 15.4kWh BYD Battery-Box Premium LVL. We also install Pylontech batteries. Their units are smaller, typically 2kWh to 3.5kWh; these are then 'stacked' to the required capacity.

Off-grid systems

Instead of connecting to the grid, a Victron system could be standalone (just solar PV, battery and Victron inverter-charger), or it could be connected to a generator, creating a standard 'off-grid' set-up. 

Please note that we do not specify or supply generators; for this you need a local generator specialist who will be able to support you in maintenance and operation of the generator. That said, if you are interested in off-grid design, it is best to design the whole system before specifying the generator, for several reasons:

  • the generator needs to be sized to run efficiently - i.e. the running load matches the required load (whilst it is customary to 'over-size' the generator, many generators cost more to run per kWh at low output levels);
  • it is important that the generator and the Victron inverter / charger frequency and voltage match e.g. 230V / 50Hz;
  • the best generators have a high quality alternator and AVR (auto voltage regulation) and are preferred to inverter based generators;
  • it is best to agree all of the Victron generator settings in advance with the generator supplier in advance.


Key datasheets for Victron components: