First job was to clear some space, make a hole in the counter, install some trunking and screw the inverter to the wall with 200mm clear around the sides for airflow. Easy peasy!!
The trunking s a bit ratty looking because I only had a second hand piece kicking around at home so I made do with what I had.
Next was find an old piece of scaffold plank and clean it up a bit with a sander and use it as a base to place the 4 x batteries on top of. This is probably optional but it helps to be able to move the batteries all together by sliding the plank to allow cleaning behind them in future.
Next I installed the two 35mm˛ battery wires starting at the inverter end. A 100Amp fuse was used at the final battery terminal and link wires were made to connect the batteries together.
If you're ever dealing with battery installations I'd caution that the potential fault currents are enormous. Always fuse a battery installation because if there's ever a fault there's a very high likelyhood it will result in a fire and always take great care when using spanners and other tools that you never contact other terminals by accident because the results will be spectacular. Finally never leave the tops of the batteries exposed because someone will at some time accidentally short them out by placing something metallic on top of them.
The main supply cable to my original office sockets was removed and diverted into the inverter as the incoming supply and a new cable was installed from the inverter back to the sockets.
The wiring is very straight forward but the terminal blocks in the inverter were very awkward and it took several attempts to get good terminations.
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