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System
- Inverter: Sol-Ark 15K-2P-N, 120/240 V split phase, ~12 kW continuous off-grid
- Batteries: 4 × Fortress eFlex 5.4 kWh = 21.6 kWh. Batteries limit sustained output to ~11.5 kW (4 × 60 A).
- Solar: 18 × Heliene 320 W ≈ 5.8 kW. Park with the ridge running north–south.
Solar strings
| MPPT | String | Panels |
|---|---|---|
| 1 | East side | 6 |
| 2 | West side | 6 |
| 3 | 2 top + 4 south end | 6 |
Strings: 6–10 panels. Never mix faces in one series string (~25% loss). Expect ~240 V open-circuit per 6-panel string on a mild day; never over 500 V.
AC power
Sol-Ark LOAD → 1/0 copper ×3 + 8 AWG ground in 1-1/4" liquid-tight (3–4 ft) → Midwest U055C010P outlet panel.
| Outlet | Use |
|---|---|
| 14-50 (50 A, 120/240 V) | House inlet or well inlet, via the 14-50 → CS6364 cord. Also RV, EV, welder. |
| 20 A GFCI duplex | Tools, lights |
Sol-Ark GRID terminals stay empty (the 4 AWG feeder relies on the inverter limiting current). Exactly one neutral–ground bond. If the Sol-Ark bonds internally, remove the outlet panel's bonding screw.
Neutral–ground bond
Standalone (well, outlets): the trailer is the source, so neutral is bonded to ground on the trailer, in one place only. For the house, use a transfer switch that also switches the neutral, so the trailer stays bonded and nobody has to change anything.
Battery DC
4 equal-length 1/0 pairs → busbar → Class T 300 A → 2 × 2/0 pairs to the Sol-Ark. CAN comms daisy-chained, terminator in the last battery, first battery → Sol-Ark BMS port.