Statpower Portawattz 3000, Руководство пользователя, Страница: 21 / 36

17
battery and the Portawattz 3000 is essential to deliver the maximum
amount of usable energy to your load. Don’t waste the investment
you have made in batteries and a highly efficient inverter by using
undersized wires.
Use only copper wire. Aluminum wire has about 1/3 more resistance
than copper wire of the same size and it is more difficult to make a
good, low-resistance connection. We recommend 2 x #1AWG or 1
x 3/0AWG copper cable (90ºC insulation rating), as the minimum
size for connecting between the battery and the Portawattz 3000.
Keep the cable as short as possible,
(Max. 10 ft./3 m). This will keep the
overall system running at peak
efficiency, and will keep the voltage
drop between the battery and the unit
to a minimum.
If the battery cables introduce an excessive voltage drop, the inverter
may shut down when drawing higher currents because the voltage
at the inverter drops below 10 volts. If you must use longer cables,
then refer to Table 6 to decide on the next best size.
Strip approximately 1/2” (12.5mm) of insulation from the ends of the
DC cables being connected to the inverter. Attach 5/16” ring terminals
to the ends of the wires to be attached to the DC terminals on the
Portawattz 3000. The ring terminals should be crimped with a proper
crimping tool.
Another option is to use Ilsco or equivalent box-lug terminals,
(available at electrical parts suppliers). The bare cable end can then
be inserted into the lug terminal.
Lower efficiency means
shorter run-times
Max. Length
of Cable
(ft./m)
Min. Cable
Size if using
Single Cables
Min. Cable
Size if using
Double Cables
10/3 No. 3/0 AWG 2 x No. 1 AWG
15/4.6 250 MCM 2 x No. 2/0 AWG
20/6.1 400 MCM 2 x No. 3/0 AWG
Table 6: DC Cable Sizes (for voltage drop less than
0.5Vdc total - based on 90ºC cable)
CAUTION!
Use cable rated at 90ºC. For cable rated below 90ºC or run in conduit, refer to
applicable codes or standards for your application. Based on Table 1 of the
Canadian Electrical Code, Part 1, and on Table 310-17 of the U.S. National Electrical
Code (NFPA 70), 1993.