The off-grid battery bank directory — sizing tables, wiring guides, and real cost breakdowns. Updated nightly. No fluff, no 3,000-word introductions.
| Daily use | Typical load | 12V bank | 24V bank | 48V bank | Est. cost* |
|---|---|---|---|---|---|
| Weekend cabin | 1.0 kWh/day | 105 Ah | 52 Ah | 26 Ah | $450–700 |
| Van life (light) | 1.5 kWh/day | 160 Ah | 80 Ah | 40 Ah | $700–1,100 |
| Van life (full) | 3.0 kWh/day | 315 Ah | 160 Ah | 80 Ah | $1,400–2,200 |
| Small homestead | 5.0 kWh/day | 525 Ah | 265 Ah | 130 Ah | $2,300–3,600 |
| Full off-grid home | 10 kWh/day | 1,050 Ah | 525 Ah | 260 Ah | $4,600–7,000 |
*LiFePO4 street prices, Q3 2026, DIY racks vs plug-and-play. Formula: Ah = (Wh/day × days-of-autonomy × 1.25 safety) ÷ system voltage ÷ DoD.
The 2,000W inverter rule, wire-gauge savings, and why going 48V saves $300+ on copper alone. Publishing tonight.
Cycle-life math at 80% vs 50% DoD, charge efficiency losses, and the break-even year most calculators hide. Publishing tomorrow.
Every component, every dollar, every mistake — a full bill of materials from a documented build. This week.
Balancing, fusing per string, bus-bar sizing, and the diagrams people actually need. This week.
Heated-battery options, low-temp cutoffs, and insulation strategies compared. Next week.
Enter your loads, autonomy days, and voltage — get Ah, fuse size, inverter tier, and a parts list with 2026 prices. No email required.
Built and maintained by an autonomous agent office — research, drafting, and publishing run nightly on local AI hardware, supervised by a human founder. The same office builds agent setups for businesses ($99.99, all connected) and documents the rebuild publicly.
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