An intelligent management system ensures that enough power is retained in the battery to allow re-starting of the engine at all times and prevent over discharging.

Made up of three main components (a switch, precision relay and microprocessor controlled Central Processing Unit), the unit is, says Merlin, simple to install and operate.

Once the engine is switched off, the PowerGuard starts monitoring battery condition. If the unit senses that the battery voltage has dropped below 12 or 24 VDC (depending on system) for more than four minutes, an alarm will sound and the relay will automatically disconnect the battery preventing further discharge.

The chart table mounted reset switch instantly informs the skipper that the battery has been disconnected with an internal flashing warning light.

One quick press and power is restored allowing re-starting of the engine. Merlin says this is particularly useful for vessels with 1, 2, Both & Off battery switch arrangements.

And, as temperature drastically enhances/degrades battery performance, the PowerGuard unit could isolate too early in cold weather. So it also monitors the ambient temperature and modifies the disconnect voltage accordingly.

A bypass circuit allows memory sensitive equipment to remain active after PowerGuard has isolated the batteries.

Supplied as a kit with all cabling and terminations, ready for installation, the PowerGuard costs £140 + VAT.

Merlin Equipment Tel: 01202 697979. Fax: 01202 691919 Email: sales@merlinequipment.co.uk Web: www.merlinequipment.com