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EasySolar-II GX - Product Manual
3.1.11. External current transformer (option)
External current transformer option to implement PowerControl and PowerAssist with external current sensing
3.1.12. Programmable analog/digital input/output ports (Aux in 1 and Aux in 2, see appendix)
The product is equipped with 2 analog/digital input/output ports.
These ports can be used for several purposes. One application is communication with the allow-to-charge and allow-to-discharge
BMS controls of a lithium-ion battery.
3.2. Features specific on-grid and off-grid systems combined with PV
3.2.1. External current transformer (optional)
When used in a grid-parallel topology the internal current transformer cannot measure the current to or from the mains. In this
case an external current transformer has to be used. See appendix A. Contact your Victron Distributor for further information
about this installation type
3.2.2. Frequency shift
When solar inverters are connected to the AC-output of the product, excess solar energy is used to recharge the batteries. Once
the absorption voltage is reached, charge current will reduce and excess energy will be fed back into the mains. If the mains is
not available, the product will slightly increase the AC frequency to reduce the output of the solar inverter.
3.2.3. Built-in Battery Monitor
The ideal solution when the product is part of a hybrid system (diesel generator, inverter/chargers, storage battery, and alternative
energy). The built-in battery monitor can be set to start and stop the generator:
• Start at a preset % discharge level, and/or
• start (with a preset delay) at a preset battery voltage, and/or
• start (with a preset delay) at a preset load level.
• Stop at a preset battery voltage, or
• stop (with a preset delay) after the bulk charge phase has been completed, and/or
• stop (with a preset delay) at a preset load level.
3.2.4. Autonomous operation when the grid fails
Houses or buildings with solar panels or a combined micro-scale heating and power plant or other sustainable energy sources
have a potential autonomous energy supply which can be used for powering essential equipment (central heating pumps,
refrigerators, deep freeze units, Internet connections, etc.) during a power failure. A problem is however that grid connected
sustainable energy sources drop out as soon as the grid fails. With the product and batteries, this problem can be solved: the
product can replace the grid during a power failure. When the sustainable energy sources produce more power than needed,
the product will use the surplus to charge the batteries; in the event of a shortfall, the product will supply additional power from the
battery.
3.3. Battery charger
3.3.1. Lead-acid batteries
Adaptive 4-stage charge algorithm: bulk – absorption – float – storage
The microprocessor-driven adaptive battery management system can be adjusted for various types of batteries. The adaptive
function automatically adapts the charging process to battery use.
The right amount of charge: variable absorption time
In the event of slight battery discharge, absorption is kept short to prevent overcharging and excessive gas formation. After deep
discharging, the absorption time is automatically extended in order to fully charge the battery.
Preventing damage due to excessive gassing: the BatterySafe mode
If, in order to quickly charge a battery, a high charge current in combination with a high absorption voltage has been chosen,
damage due to excessive gassing will be prevented by automatically limiting the rate of voltage increase once the gassing voltage
has been reached.
Less maintenance and aging when the battery is not in use: the Storage mode
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