DC-DC battery chargers-converters

As a manufacturer of battery chargers, we generally recommend calibrating a charger at around 10% of the service park for Lead batteries.

Example: a 25A charger is recommended for a service park between 200 and 300Ah.

However, increasing this ratio may be justified in certain cases:

– Specific battery technology (i.e. Lithium LiFe PO4 with BMS / Recommended Ratio 30%).

– The need for additional energy to supply constant DC consumers (i.e. return from sea, short stopover, discharged batteries, you remain on the boat and a certain number of consumers are in operation): the charger must then be sufficiently powerful to recharge batteries and supply consumers.

CRISTEC chargers are compatible with Lithium Iron Phosphate (LiFePO 4) technology batteries with integrated BMS (Battery Management System).

• LiFE PO4 batteries present 3 x major advantages:
• Weight / bulk saving Autonomy thanks to the high discharge rate (90%)
• Fast charging with a suitable charging current

These are batteries that absorb a very high current when charging. It is therefore necessary to ensure, within the framework of the adaptation of an existing installation, to dimension accordingly:

• The battery charger (C / 3: example 25A model for 90Ah).
• The alternator
• Cable sections

In the case of specific Lithium batteries, please consult CRISTEC.

This option makes it possible to adapt the charging voltage of the charger according to the ambient temperature of the battery room. This allows for optimized battery charge and improves battery life. We can offer you two solutions, which can be deployed individually or be shared: Addition of an STP temperature sensor which will be connected to the charger: The latter will be placed in the battery room, as close as possible to the battery, on one of the cables, outside the box. This option is particularly recommended when the batteries are in a high temperature environment (confined room, high outside temperature, etc.).

CRISTEC chargers are designed to be installed on a vertical wall while maintaining a 150mm area around the charger.

You have the option of installing them horizontally, but in this case IP protection will be impacted and thermal cooling will no longer be optimized.

Our chargers are configured by default when leaving the factory for sealed lead batteries *.

We have worked in close collaboration with battery manufacturers to offer a charge profile that meets the needs of recharging a mixed banks: sealed lead *, AGM, gel, lead calcium and spiral lead.

* Closed electrolyte without maintenance

For certain special cases, it is possible to deactivate the Boost via the device provided for this purpose. Refer to the corresponding manual.

This function is available on the YPOWER and HPOWER ranges.

This is an automatic weekly cycle (whether or not inhibited using microswitch F) which optimizes the life of the battery.

It only intervenes after a complete recharge cycle (BOOST, ABSORPTION and FLOATING).

The charger will automatically generate a timed voltage step every 7 days regardless of the position of the Boost microswitch.

This makes it possible to limit the risks of sulphation of the plates, in particular when the service banks are composed of several elements mounted in parallel and when the latter remain permanently subjected to a floating type load regime.

Be sure to check with the battery manufacturer that this function is compatible with them (some types of AGM batteries do not support this function).

You can leave your CRISTEC charger connected at all times.

For long periods of inactivity, you also have the option of selecting the Wintering setting at the level of the battery type selection devices *.

* Micro-switches, encoder wheel or push button depending on model.