5
EN
System modes
mode
picture
description
energy source
1
The boiler is primarily powered with
photovoltaic current. If no solar energy is
available, a fothermo power supply can
optionally be used to heat the boiler to the
set minimum temperature.
PV module
+
fothermo
power
supply unit*
2
As soon as the connected battery reaches
a voltage of 13.5 V, the excess energy is
used to power the boiler. This happens
while the battery is being charged.
12 V battery
Approved:
LiFePO4, lead acid
3
In addition to the excess control, as in
mode 2, the connected battery is dischar-
ged to operate the boiler. This happens as
soon as the temperature falls below the
set minimum temperature. But only as
long as the battery voltage does not drop
below 12.4 V.
12 V battery
Approved:
LiFePO4, lead acid
4
This mode should be selected if there is an
external energy management system (e.g.
solar charge controller with deep dischar-
ge protection) that releases the power for
the boiler.
External energy
management
5
As soon as the connected battery reaches
a voltage of 27.0 V, the excess energy is
used to power the boiler. This happens
while the battery is being charged.
24 V battery
Approved:
LiFePO4, lead acid
6
In addition to the excess control, as in
mode 2, the connected battery is dischar-
ged to operate the boiler. This happens as
soon as the temperature falls below the
set minimum temperature. But only as
long as the battery voltage does not drop
below 24.8 V.
24 V battery
Approved:
LiFePO4, lead acid
*can be purchased separately.