Vermont Homestead — 48V Off-Grid with Well Pump
home · 48V system · Burlington, VT
10-acre homestead running fully off-grid on a 48V/1200Ah LiFePO4 bank + 6kW PV array. Primary residence — well pump, washing machine, all LED lighting, induction cooking when solar allows. Generator backup for stretches over 3 cloudy days.
Daily load
11,129 Wh
Daily Ah
232 Ah
Battery
1000 Ah LiFePO4
Solar
4000 W
Load budget
| Load | Watts | Qty | Hrs/Day | Wh/Day |
|---|---|---|---|---|
| Residential Fridge (Inverter) | 150 | 1 | 10 | 1,500 |
| Chest Freezer (Off-Grid) | 100 | 1 | 10 | 1,000 |
| Well Pump | 750 | 1 | 2 | 1,500 |
| Washing Machine | 500 | 1 | 0.8 | 400 |
| UV Water Purifier | 40 | 1 | 1 | 40 |
| Septic Pump | 500 | 1 | 0.5 | 250 |
| LED Cabin Light | 5 | 10 | 4 | 200 |
| Ceiling Fan | 35 | 3 | 6 | 630 |
| Laptop | 60 | 2 | 5 | 600 |
| Starlink | 75 | 1 | 24 | 1,800 |
| WiFi Router | 10 | 1 | 24 | 240 |
| TV / Monitor | 60 | 1 | 4 | 240 |
| Induction Cooktop | 1800 | 1 | 0.4 | 720 |
| Electric Kettle | 1500 | 1 | 0.2 | 300 |
| Microwave | 1000 | 1 | 0.25 | 250 |
| Coffee Maker | 900 | 1 | 0.25 | 225 |
| Security Camera | 8 | 3 | 24 | 576 |
| Motion Sensor Light | 15 | 2 | 3 | 90 |
| Smoke DetectorCRITICAL | 1 | 1 | 24 | 24 |
| CO DetectorCRITICAL | 1 | 1 | 24 | 24 |
| Inverter Standby | 15 | 1 | 24 | 360 |
| Workshop Light | 60 | 1 | 2 | 120 |
| Drill Charger | 40 | 1 | 1 | 40 |
Battery bank
20 × 200Ah (4S5P) for 48V/1000Ah
Your daily consumption is 232Ah. With 3 days of autonomy, you need 696Ah of usable capacity. LiFePO4 (Lithium Iron Phosphate) batteries should only be discharged to 80% depth of discharge, so you need 869Ah of total capacity. We recommend a 1000Ah bank (20 × 200Ah (4S5P) for 48V/1000Ah), giving you 800Ah of usable capacity — enough for 3 days without any charging.
Solar array
20 × 200W panels · 105A charge controller
Your daily consumption is 11129Wh. With 4 peak sun hours, a 75% system efficiency factor, and LiFePO4 (Lithium Iron Phosphate) round-trip efficiency of 96%, you need 3864W of solar panels. We recommend 20 × 200W panels (4000W total). This array will produce approximately 250Ah per day at 48V. You'll need a charge controller rated for at least 105A. MPPT recommended — higher efficiency at this array size.
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