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A Portable Power Box for Photographers

Step 4Wiring

Wiring
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The Samlex manual indicates that the inverter needs a 40 amp fuse. It's a common electrical practice for a 40 amp circuit to use 8 gauge cable. With a large cable, it is easier for the inverter to draw the amps needed to run the strobes. Standard household 12 gauge wire is too small and will cause the inverter to beep and switch to a modified sine wave.

Use braided 8 AWG wire instead of stranded. It is much more flexible and will put less force on all the connections. SOOW 8GA cable has several braided wires inside and is relatively inexpensive.

Tin the ends of the cables and solder/torch on the battery connectors. Use full sized battery connectors. Smaller sized connectors can limit the maximum load by over 400 watts. I was unable to find the appropriate inverter connectors, so I tinned and shaped the wire with pliers so they would fit inside the inverter power sockets.

If the inverter will not power over a 1000 watts of strobes without beeping, unsolder the battery clamps and try directly attaching the wires to the battery terminals with bolts and  washers. Use two washers on each terminal to help prevent the bolt from being pulled through. Cutting the ends off a 2 1/2"  corner brace makes very strong square washers.  In the future I might try using the wire from a pair of old jumper cables to see if there are any amps to be gained by having a larger conductor.

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