Li-Ion Batteries; Other Li-Ion Batteries; More On Batteries And Battery Charging; Ess - Energy Storage Systems: Feeding Energy Back Into The Grid - Victron energy EasySolar-II GX Product Manual

EasySolar-II GX - Product Manual
The Storage mode kicks in whenever the battery has not been subjected to discharge during 24 hours. In the Storage mode float
voltage is reduced to 2,2V/cell (13,2V for 12V battery) to minimise gassing and corrosion of the positive plates. Once a week the
voltage is raised back to the absorption level to 'equalize' the battery. This feature prevents stratification of the electrolyte and
sulphation, a major cause of early battery failure.
Battery voltage sense: the correct charge voltage
Voltage loss due to cable resistance can be compensated by using the voltage sense facility to measure voltage directly on the
DC bus or on the battery terminals.
Battery voltage and temperature compensation
The temperature sensor (supplied with the product) serves to reduce charging voltage when battery temperature rises. This is
particularly important for maintenance-free batteries, which could otherwise dry out by overcharging.

3.3.2. Li-ion batteries

Victron LiFePO4 Smart batteries
Use the VE.Bus BMS

3.3.3. Other Li-ion batteries

Please see https://www.victronenergy.com/live/battery_compatibility:start

3.3.4. More on batteries and battery charging

Our book 'Energy Unlimited' offers further information on batteries and battery charging, and is available free of charge on our
website: https://www.victronenergy.com/support-and-downloads/technical-information.
For more information on adaptive charging, please also refer to the General Technical Information on our website.
3.4. ESS – Energy Storage Systems: feeding energy back into the grid
When the product is used in a configuration in which it will feed back energy into the grid it is required to enable grid code
compliance by selecting the appropriate grid code country setting with the VEConfigure tool.
Once set, a password will be required to disable grid code compliance or change grid code related parameters. Contact your
Victron Distributor if you require this password.
Depending on the grid code, there are several reactive Power control modes;
• Fixed cos φ
• Cos φ as a function of P
• Fixed Q
• Q as a function of input voltage
Figure 1.
P
1.0 S
max
P
D
Q
0.1 S
max
-0.75 P 0.75 P
D D
Reactive Power capability
If the local grid code is not supported by the product an external certified interface device should be used to connect the product
to the grid.
The product can also be used as a bidirectional inverter operating parallel to the grid, integrated into a customer designed system
(PLC or other) that takes care of the control-loop and grid measurement,
Special note regarding NRS-097 (South Africa)
1. The maximum allowed impedance of the network is 0.28Ω + j0.18Ω
2. The inverter is fulfilling the unbalance requirement in case of multiple single phase units only when the Color Control GX is
part of the installation.
Special notes regarding AS 4777.2 (Australia/New Zealand)
Page 5 Product Description