Users can connect the AC charging cable of EF DELTA to the power grid and connect a device to EF
DELTA and turn on the AC switch to automatically enter the entry-level UPS mode. When the external
power is cut o, power will be supplied from the battery immediately to protect connected devices.
1.Entry-Level UPS User Guide
Note: (Before connecting multiple Delta’s together in this mode, All machines must be fully charged)
Users can connect multiple fully-charged EF DELTAs (Up to 3) in series using the AC charging cables to get
continuous power and supply appliances with high output requirements for up to 1.8 hours. In this mode, do
not connect EF DELTA to the power grid using an AC charging cable, or the overcurrent protection (<20A)
may be triggered. Before using this mode of operation connect each EF DELTA to a home power grid and
charge each EF DELTA separately. It is not recommended to charge more than two machines simultane-
ously from the same household power outlet. Otherwise, the excessive load may cause overload/damage
to the home power circuit. To use this function, you need to at first set any of the machines as the master
and the others as Slave 1 and Slave 2. Connect one end of the AC cable to the AC output port of the master
unit and the other end to the input port of Slave 1. Then, connect one end of the AC cable to the AC output
port of Slave 1 and the other end to the input port of Slave 2. After connecting the machines, turn all the AC
switches of the machines on to activate multi-machine series mode. Finally, connect all the appliances to
the AC sockets of the Slave 2 and then you can charge your devices using EF DELTA and enjoy the benefits
of extended powering time.
2 . Multi Machine Series Mode User Guide
Multi-Machines Series Mode is a multi-level power series solution developed based on the UPS function.
It allows users to connect multiple EF DELTAs in series to get continuous power that is multiple times of a
single machine. The principle of use is that when the power of an individual DELTA is used up, the next
DELTA can immediately replace it to ensure uninterrupted power supply. This a entry-level grade UPS
function that does not support 0ms switching.
Note: Do Not connect devices with high uninterrupted power supply requirements. Perform multiple
tests to confirm compatibility before connecting such devices as data servers and workstations with EF
DELTA. EcoFlow will not be responsible for any loss of data or equipment damage caused by customers’
failure to determine the suitability of Delta to support their UPS
12V CAR
AC ON/OFF
Master unit AC on Slave unit AC on
Example 1 ：
100%
12V CAR
AC ON/OFF
100%
12V CAR
AC ON/OFF
12
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