Samlex America SAM-800-12 - Manuel (Page 10)

8 | SAMLEX AMERICA INC.
SECTION 4 | Installation
Dc Side connections
General information
1. The metal chassis of the inverter and the Grounding Terminal of the NeMA5-15r
outlet(s) are internally bonded (connected) to the Negative DC Input Terminal on the
inverter. In a vehicle / boat, the Negative Terminal of the battery is bonded to vehicle
chassis / boat’s hull. Hence, the metal chassis of the inverter and the AC loads will be
automatically grounded (bonded to the vehicle chassis / boat’s hull).
2. Please ensure that the Negative DC Input Terminal on the inverter or the battery Nega-
tive Terminal on the battery itself is bonded to earth Ground WHeN THe INVerTer IS
USeD oN LAND.
3. Do not use with Positive Grounded electrical Systems (the majority of modern automo-
biles, rVs, trucks and boats use Negative Grounded electrical Systems).
4. observe correct polarity when connecting the DC input terminals of the inverter to the
battery. Connect Positive of the battery to the Positive input connector of the inverter
and the Negative of the battery to the Negative input terminal of the inverter. reverse
polarity connection will result in a blown fuse and may cause permanent damage to
the inverter. Damage due to reverse polarity is not covered under warranty.
requirements of Dc input power Source
approx. Dc input current required by inverter = power consumed by the ac Load in
Watts ÷ 10.
DC input currents at Continuous rated Power output will be:
• SAM-250-12 25A
• SAM-450-12 45A
• SAM-800-12 80A
12 VDC input to the inverter should be fed from a 12V battery System or from a 12.5 VDC
to 15 VDC regulated DC Power Supply. If a DC Power Supply is used, its output current
capacity should be more than 2 times the maximum DC input current drawn by the
inverter. further explanation of operation is based on Dc input power from a 12V
battery. It is recommended that Deep Cycle Type batteries are used. for detailed techni-
cal information on types, construction, specifications, sizing, connections and charging
/ discharging of Lead Acid batteries, please read online White paper titled “Batteries,
chargers and alternators” at www.samlexamerica.com under Support/White papers.
Dc input power terminals
Custom made DC input terminals using M4 Nut / Thumb Screw arrangement have been
provided for connecting DC input cables (7, 8 in fig 3.1 to 3.3).
important Wiring information
Inadequately sized DC input wiring of inverters produces higher voltage drop resulting
in higher power loss and reduced battery-operating time. Voltage Drop = Current x
Resistance. Wires should be sized based on (a) maximum allowable current (Ampacity)
and (b) allowable voltage drop in the wiring resistance (Wiring resistance is the sum of