Boats with Inboard Engines

Irish river cruiser
Irish river cruiser

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Thames cruiser
Thames cruiser

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Shannon River cruiser
Shannon River cruiser

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Irish river cruiser
Irish river cruiser

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This section is ONLY for owners of boats with inboard engines, boilers connected to an engine heat exchanger, and a 220v shore power connection system. If your boat has an outboard engine or does not have a boiler with an engine heat exchanger, please go the next page. If it does not have a 220v shore power connection, please Contact Us. The solution is technically different but similarly priced.

The cost of solar panels has fallen steeply in recent years and is now an economic source of electricity, particularly for "off-grid" situations like house-boats and river craft.

Installation is easy and a flat roof is usually available, making the task within the competence of most handymen. A 300w panel measures 1.6 x 1m, so space is seldom a worry either. 

While we are happy to supply the solar panels, you are free to purchase what best suits your personal preference, but the minimum installed capacity is 300w and 400w is much preferable.

Solar Controllers
Min 300w solar energy
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The solar panels are connected to a charge controller that manages the input and output of solar power to the battery bank. This is necessary to feed the correct voltage to the batteries and to cut off the charging when the batteries are full.

We also offer the much more versatile hybrid controller/inverters that also convert 12 or 24v DC current to 110/220v AC power for your domestic circuit. and choose the source from which to obtain the power that you need.​

The MPPT controller injects the current from solar panels into your domestic battery pack. If you are using our 12v water heating system, you need at least 300Ah (more is better). If you are going to use our 110/220v inverter based solution, then you should have an installed battery capacity of at least 600Ah.

During the day the solar panels will usually be producing enough not to discharge your batteries significantly, but after sundown you need sufficient capacity to handle the load for the heater.

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Of our own design and manufacture, this is makes our system UNIQUE!

It has a dual function:It is of our own design and manufacture. It monitors


  1. the battery charge level

  2.  the water temperature


If the battery charge level is greater than 85% (user configurable) AND the water temperature is less than 40°C and not more than 50°C, it switches on the water heater automatically.


The intelligent controller can be connected to a 12v 300w  heating element that replaces that currently in your boiler (Quick & Isotherm supported - 24 & 48v on request). This solution is best suited to boats having modest solar and battery installations (300w of solar and 300Ah of battery). It is slower to heat the water than a 1200w 220v element, but has no other disadvantages. If the boat is also equipped to be plugged into shore power, it will continue to operate normally.


The intelligent controller can be connected to a 1500W 110/220v modified sine wave inverter that is connected directly to the existing heating element in your boiler.

This solution requires a solar panel installation of at least 600w and an equivalent amount of battery power. It is much easier to install and heats the water much faster.

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The intelligent controller is then connected to your boiler. If you have an inboard engine, you can connect to the heat exchanger and should use the ATI22l model illustrated.


If you have an outboard, you will need to use a small domestic boiler like the ACB 60l unit shown here. In both cases there is a range of tank capacities. This solution requires at least 600w of solar panels and a significant battery bank.

Remote Control Panel

Optionaly, the intelligent controller can be connected to a remote control panel that also acts as a fuse/switch that is needed in all cases. The advantage is that the system can be turned on or off easily and its status ia always visible. Since the controller is usually invisible, this is handy.

Professionals Only