User Operation; Water Heating; Normal Operation - Marlec Solar iBoost+ Installation And Operating Instruction

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User Operation

Flashes when
energy is being
diverted to the
immersion heater.
Symbol is permanently
lit when any boost
function is on
Indicates a
problem with
the unit when lit (see
Trouble Shooting)
Display
Each press
moves through
the Display Cycle
(see Display
Cycle)

Normal Operation

During normal operation the unit will show one of the following displays:
Heating by Solar
01.45 kW
Water Tank
HOT

Water Heating

OFF
These messages will be overridden when other functions such as timed or manual boost
are active.
A
Enables
programming
mode (see
Programming)
Solar iBoost+ is diverting energy to the hot water tank.
The instant value of energy being diverted is shown
together with an indication of the immersion heater
Htr1
currently being supplied (if two heaters are connected
will switch between Heater 1 and 2).
When energy is diverted the blue symbol flashes:
Shown when the unit is attempting to divert energy to
the immersion heater but tank has reached maximum
temperature and switched off.
There is no excess generation for the Solar iBoost+ to
divert to the hot water tank.
B
Enables the
sender pairing
process (see
Pairing the
Sender)
13
Boost
Provides a Boost
of Hot Water (see
Manual Boost)

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Questions and answers

Martyn Jones
April 17, 2025

Since my Solar I-boost was installed in 2014, when I had no battery storage, I have had retrofit Pylon 2 x 3.5kWh batteries and then a new generation system installed with 3 x Fox EP5 5.18kWh batteries - ie a total BESS od 22.54 kWh x 90% = 20+ kWh of usable storage - and so my I-boost is only heating the water when I have SOC 100% = 22.54 kWh stored. But can I not leave my gas HW heating off and simply press the manual boost and use any available battery storage ??

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