Tripp Lite SU60KX manual Internal Battery, Battery Strings, Front View of SU20KX and SU40KX

4 Internal Battery

The SU20KX, SU40KX and SU40K models all use a +/-240Vdc (480V) DC internal battery system. An internal battery pack (number of packs vary by model) supplies the UPS system with battery backup power. Each internal battery pack consists of 40 12Vdc VRLA batteries arranged in two strings: one string of 20 positive batteries (black cable) and one string of 20 negative batteries (red cable). The two strings are connected by a neutral (N) point (See Figure 4a).

B+ N B-

12Vdc, 20pcs 12Vdc, 20pcs

Fig 4a Battery Strings

All other KX, K and KTV models are designed with an external battery cabinet.

Both the SU20KX and SU40KX model’s internal battery space (Figure 4b) can hold eight battery packs. Each battery pack contains 10 batteries (9AH, 12Vdc, VRLA), giving them a maximum capacity of 80 batteries.

Fig 4b Front View of SU20KX and SU40KX Fig 4c Front View of SU40K

The SU20KX model’s standard battery quantity is 40, with a discharge time of about 5.5 minutes on full load. Upgrading to 80 batteries results in a discharge time of about 13 minutes on full load.

The SU40KX and SU40K (Figure 4c) model’s standard battery quantity is 80, with a discharge time of about 5.5 minutes on full load.

91