Here's my recent battery cart build (99% finished but a few niggles to work on):
BOM (Tax + shipping to California included):
1x Seville UltraHD Solid Wood Top 2-Drawer Steel Rolling File Cabinet, 20" x 18" - $147.57
3x 48V 50Ah Stackable LiFePO4 Battery - $1,251.35
1x Rich Solar 3,000 Watt 48 Volt All In One Solar Inverter - $422.55
50 ft. temco 4awg welding cable - $79.33 (turns out I way over-ordered)
50 pcs temco tinned lugs in 1/4 and 5/16 - $28.71 (also over-ordered)
2x 150a generic busbars - $21.74
4x MNEDC breakers 50/100a - $89.42
1x HardieBacker 0.42 in. x 3 ft. x 5 ft. Cement Backerboard - $19.87
1x Square D Homeline Load Center - $23.73
1x Homeline 30a breaker - $7.97
2x generic NEMA L14-30 male and female plugs - $15.20
Total cost: $2107.44 (yeesh, I told my wife I'd keep it under $2k). I do plan to claim the tax credit after I hook this up to the house.
Misc stuff I had lying around paint, angle brackets, screws, pop-rivets, bolt anchors, wire nuts, electrical tape, PVC fitting, a few feet of 10awg THHN and SOOW, light socket and bulb
Tools I had to pick up: TEMCO crimper, large gauge wire cutters
This doesn't include the L14-30 generator input side to the house
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