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My latest project has been modifying a battery box for the inevitable public safety power shutoffs this summer (and potential related emcomm use).

The box features a voltmeter with an integrated USB fast charger, a power switch to prevent inadvertent draining of the battery, and a 12-volt power socket.

The battery that I’m using is a 12-volt, 35 amp-hour AGM battery. There is extra space in the box to hold an inverter and spare parts.

Future improvements will include a panel-mounted quick-disconnect port to replace the one hanging out of the lid, and a 12-volt circuit ammeter to monitor my power usage.

This project was significantly more expensive to assemble myself than it would have been to purchase pre-built online; however, I was able to customize it and use higher-quality components from Powerwerx.

Parts List

• Duracell 35-amp hour AGM sealed lead-acid battery with J terminals: $89.99 – https://www.batteriesplus.com/productdetails/sladc12=35j
• NOCO Golf Cart Battery Box: $11.99 – https://www.batteriesplus.com/productdetails/box6v
• Powerwerx Panel Mount Combination Single USB QC 3.0 with Red LED Volt & Amp Display: $29.99 – https://powerwerx.com/panel-usb-amp-volt-quick-charge-qc-30-red
• Powerwerx Panel Mount Red Switch for 12V Systems: $9.99 – https://powerwerx.com/panel-mount-red-switch
• Panel Mount Cigarette Lighter Socket Automotive Marine Grade: $7.99 – https://powerwerx.com/panel-mount-cigarette-lighter-socket-automotive
• Red and black 10-gauge wire
• Female F2-terminal crimp-on connectors
• Inline blade fuse holders
• Blade fuses