My $850 720 wh Solar Briefcase (if you don't count the tools)


New Member
So, I set out to try to make a battery and duplicate Will's Milk Crate build; but then went on to the briefcase idea as I was wandering the aisles of Harbor Freight. So, here it is. A full supply list and cost is included. This was a fun project and will help me when I'm remote working from the campground next week, and was good prep for my next project of building a 280 AH LiP04 battery for my trailer (cells and BMS on the way . . .But I might go with two Fortune 100 AH instead, so stay tuned for a deal on Eva cells).
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Battery: Fortune Cells 60AH &BMS Daly 12V 80 Amp 4s
Power Inverter Pure Sine Wave 600Watt 12V DC to 110V 120V with Remote Control Dual AC Outlets and USB Port for RV Car Solar System Emergency
HYCLAT Red 50A 6-10 Gauge Battery Cable Quick Connect Disconnect Plug Wire Harness Plug Connector Recovery Winch Trailer (4 Pack)
ALLPOWERS 20A Solar Charger Controller Solar Panel Battery Intelligent Regulator with USB Port Display 12V/24V
25 Pieces Cable Management Desk Wire Organizer Cable Ties Cord Management Clips
Jtron 6-way RV Fuse Blocks blade box DC 12~32V 12v Fuse Block Holder With LED Indicator Light Kit For Automotive Car Boat Marine Trike (6 way)
P-A000146N - 6" Extension Cord with Flat Rotating Plug - Black
Heavy Duty Double Sided Tape, UPwoktem Mounting Tape Easy Peel Off Waterproof Foam Tape for Car Home Office Decor (16ft X 0.8inch, 5925 Red)
GG Grand General 55261 Red 10-Gauge Primary Wire, 25 Ft
GG Grand General 55260 Black 10-Gauge Primary Wire, 25 Ft
VIGRUE 160PCS Copper Wire Lugs [4 6 8 10 AWG 1/4-5/16] Battery Cable Lug Crimp Wire Connector Ring Terminals with 2:1 Heat Shrink Tubing Assortment Kit
6 AWG Gauge Red + Black Pure Copper Battery Inverter Cables Solar, RV, Car, Boat 4 feet 3/8 + 5/16 in Lugs
3800 Weatherproof Protective Case, Large, Black
AC=DC {Power Supply (10 A)
DC Power Supply Variable 3 Digital LED Display Adjustable Regulated Switching Power Supply Digital with Leads Power Cord (30V 10A)


New Member
Very nice build. I did a build using the same case so its interesting to see a different variation. Love the parts list you provided...thanks for sharing


New Member
Credit to Will for the basic knowledge and inspiration to get started down this road. And to Rocketman for the way he set up his case. I thought about sawing through the side and putting the plugs on the outside, but it seems like this thing would get hot and running it with it cracked a little would give better airflow. If I can do this, anyone can . . . It could be refined a bit, but for me it's a useful tool.



Staff member
You have 768Wh by the way... depending on your charge parameters. The math is Ah x nominal voltage, which for a 4S LFP bank would be 12.8V
Cool build! I’m sure it is far lighter than mine. I clock in at 2048Wh on mine, so it is a bit heavy to carry.


New Member
According to the seller, these Fortune packs are fine to use on their side. The only thing they don't like is sitting upside down. . . good to know.