Tiffin Allegro Class A — Lithium Boondocking Setup
rv · 12V system · Flagstaff, AZ
36-foot Class A motorhome with 600Ah LiFePO4 replacing the original 4×6V flooded bank. Rooftop 800W solar handles most days — can run the residential fridge, coffee, and microwave without the genset on sunny boondocks.
Daily load
5,010 Wh
Daily Ah
418 Ah
Battery
1200 Ah LiFePO4
Solar
1200 W
Load budget
| Load | Watts | Qty | Hrs/Day | Wh/Day |
|---|---|---|---|---|
| Residential Fridge (Inverter) | 150 | 1 | 10 | 1,500 |
| Microwave | 1000 | 1 | 0.3 | 300 |
| Coffee Maker | 900 | 1 | 0.3 | 270 |
| TV / Monitor | 60 | 1 | 5 | 300 |
| Starlink | 75 | 1 | 18 | 1,350 |
| LED Cabin Light | 5 | 6 | 4 | 120 |
| Interior LED Strip | 12 | 1 | 5 | 60 |
| Roof Vent Fan | 15 | 2 | 8 | 240 |
| Freshwater Pump | 60 | 1 | 0.8 | 48 |
| Furnace Blower | 30 | 1 | 4 | 120 |
| Laptop | 60 | 1 | 3 | 180 |
| Phone Charger | 10 | 3 | 3 | 90 |
| CO DetectorCRITICAL | 1 | 1 | 24 | 24 |
| LP Gas DetectorCRITICAL | 1 | 1 | 24 | 24 |
| Inverter Standby | 15 | 1 | 24 | 360 |
| Smoke DetectorCRITICAL | 1 | 1 | 24 | 24 |
Battery bank
4 × 300Ah in parallel
Your daily consumption is 418Ah. With 2 days of autonomy, you need 835Ah of usable capacity. LiFePO4 (Lithium Iron Phosphate) batteries should only be discharged to 80% depth of discharge, so you need 1044Ah of total capacity. We recommend a 1200Ah bank (4 × 300Ah in parallel), giving you 960Ah of usable capacity — enough for 2 days without any charging.
Solar array
6 × 200W panels · 125A charge controller
Your daily consumption is 5010Wh. With 6 peak sun hours, a 75% system efficiency factor, and LiFePO4 (Lithium Iron Phosphate) round-trip efficiency of 96%, you need 1160W of solar panels. We recommend 6 × 200W panels (1200W total). This array will produce approximately 450Ah per day at 12V. You'll need a charge controller rated for at least 125A. MPPT recommended — higher efficiency at this array size.
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