Valve Regulated Lead Acid Battery Box BB150A

The Battery Box BB150A is one in the range of Gresham Power
Electronics’ battery boxes. It affords a secure means of housing
batteries which are used for backing up the ship’s main and other
supplies.

Access for maintenance and repair is from the front via a removable
front panel. The top mounted control and monitoring enclosure
contains front mounting panel meters, indicating lamps and a double
pole ON/OFF circuit breaker.

A control and monitoring enclosure is bolted to the top of the battery
box and the connections between the control enclosure and the main
battery enclosure are gas tight.

Louvres pressed outwards on the front panel allow cooling by natural
convection.

The maintenance free batteries selected are built in accordance with
BS 6290 Part 4 (1997) and have a 7 to 10 year design service life at
20°C. They are high integrity Valve Regulated Lead Acid cells with
case material that is flame retardant (rated V0 (UL94) oxygen index
30).
Nominally 24 volt, continuous float and recharge should be in the
range 27.0V to 27.6V. A low ripple charger (such as in the Gresham
3RC range) should be employed in order to maintain battery life.The
nominal battery rating is 150Ah at 20°C.
The battery box is a custom built steel enclosure 985mm x 690mm x
441mm overall dimensions that is designed to be mounted on Xmounts with top steadies. Protection level is to IP23.

Electrical connections to and from the Battery Box are made on M8
(x1.25) studs for the main connections and to a terminal block, for
remote sense and indications. The studs and terminal block are
situated in the main battery enclosure. Access to the studs and
terminal block is gained via a gland plate which is situated on top of
the main enclosure behind the control and monitoring enclosure.
An M10 external earth stud is provided on the top of the enclosure
adjacent to the gland.