Off-Grid Build Reference
12V Power Planner
WanderTears
DIY Teardrop Camper Plans
List what you'll run, set the hours you'll use each item per day, and your daily power budget calculates as you type. The panel sizes your battery and solar to match. Amps and amp-hours are figured at 12 volts (Watts ÷ 12 = Amps). If using your phone, turn it horizontal.
Your Loads
| Device | Watts | Hrs/day | Duty % | Ah/day |
|---|
Watts — check the device label or use typical values (LED light ≈ 5W, roof fan 5–35W,
water pump 50–60W, 12V fridge ≈ 50W running, USB port 5–12W).
Duty % — for things that cycle on and off. A compressor fridge runs roughly 30–50% of the
time, so set it near 40. Most other items run steady at 100.
Daily Draw
0
Ah / day
A 100Ah lithium battery (90% usable) would last
about — on this draw.
Lead-Acid / AGM battery
0Ah (use only ~50%)
Lithium (LiFePO4) battery
0Ah (use ~80–100%)
Solar to recharge / day
0W (good sun)