Portable PSU TP2 Mk 4

Portable PSU, TP2 Mk 4

 A self-contained 12 V, 60 Ah power supply unit which has the advantage of being recharged either from 240V AC 50 Hz mains or from a 12V DC, source such as a car, is available from Lab-Craft Limited.

Applications include the provision of power, on sites remote from mains supplies, for inverter-driven fluorescent lighting fittings and battery-powered hand tools, mobile rigs, etc.

The unit is supplied complete with an electronically regulated battery charger which automatically cuts out when the battery terminal voltage reaches approximately 14·5 V, indicating a full charge. Excessive battery gassing, caused through overcharging, is eliminated by this arrangement and a state-of-charge indicator shows when the battery requires a prolonged charge (under 10 V white sector); is below full charge (10 to 13 V green sector); or is fully charged (13 to 15 V red sector). The typical charging current for a fully discharged battery is between 3 to 4 A and a 60 Ah battery should completely charge from the mains in 36 hours. A thermal cut-out is fitted which temporarily switches off the charge if the unit overheats due to poor ventilation or if the battery heats up excessively due to shorted cells, damaged plates, etc. The unit has been designed and tested to BS3456.

The TP2 Mk 4 is supplied complete with a detachable carrying handle and can be fitted with any suitable 12V car battery not exceeding 280 x 175 x 205mm high (not supplied).

The case is constructed in two robust acid-resistant polyethylene moldings, with battery ventilation holes in the lid, and the dimensions are 420 x 198 x 285mm high (approx.). Costing £52 plus VAT.

Here you find 4 models, 4 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Lab-Craft Ltd.; Woodford Bridge