Nice system — solidly sized for whole-house backup or energy-heavy homes. Below I expanded the specification, did the math (step-by-step) and added practical installation, performance and safety notes you can show to a customer or installer.

# System overview

Model: Complete DC48V 16 kW split-phase solar power system

Includes (as you listed):**

* 1 × Solis 16 kW split-phase inverter (120/240 V output)

* 2 × 16 kWh lithium-ion battery modules (48 V nominal each)

* 24 × 700 W PV modules (total array)

* Full mounting system, cabling, connectors and accessories

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 Key electrical numbers (calculated explicitly)

Solar array total peak power

24 panels × 700 W each = 24 × 700 = 16,800 W = 16.8 kW

Battery energy and capacity (at 48 V nominal)

Each battery = 16,000 Wh.

16,000 Wh ÷ 48 V = 16,000 ÷ 48 = 333.333… Ah (per battery).

Two in parallel → 2 × 16,000 Wh = 32,000 Wh  total =32.0 kWh.

Two in parallel → 2 × 333.333… Ah = 666.667 Ah** at 48 V.

Usable storage (example using 80% DoD recommendation)

32,000 Wh × 0.80 = 25,600 Wh = 25.6 kWh usable.

Battery runtime examples (usable 25.6 kWh):

* At inverter full rated output 16 kW: 25.6 kWh ÷ 16 kW = 1.6 hours.

* At typical household continuous load 5 kW: 25.6 kWh ÷ 5 kW = 5.12 hours

Estimated PV energy production (simple model)

Array size = 16.8 kW. Assume total system yield ~80% of raw (accounts for inverter/soiling/wiring/temperature). For different peak-sun-hour (PSH) scenarios:

* 3 PSH: raw = 16.8 kW × 3 h = 50.4 kWh → net ≈ 50.4 × 0.8 = 40.3 kWh/day

* 4 PSH: raw = 16.8 × 4 = 67.2 kWh → net ≈ 53.8 kWh/day

* 5 PSH: raw = 16.8 × 5 = 84.0 kWh → net ≈ 67.2 kWh/day

* 6 PSH: raw = 16.8 × 6 = 100.8 kWh** → net ≈ 80.6 kWh/day

(These are ballpark estimates — real production depends on location, tilt, shading, temperature, and actual inverter clipping.)

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Design notes & recommendations

Array vs inverter sizing

 Array = 16.8 kW and inverter = 16.0 kW: array is slightly larger than inverter. That’s common (solar oversizing) and helps maximize production in lower-irradiance periods; expect some clipping at peak sun. Good tradeoff for more daily energy.

MPPT / stringing advice (high-level)

* Configure strings to stay within the inverter’s DC input voltage/current limits (check the Solis inverter datasheet). A typical layout could be multiple parallel strings of panels sized so Voc at the coldest expected temperature does not exceed inverter Voc limit.

* For safety/ease: aim for equal string lengths and use string fuses/breakers where required.

*Battery configuration & BMS

* Two 48 V modules in parallel provide 32 kWh nominal. Make sure batteries are compatible for parallel operation and each module is monitored by a robust BMS.

* Ensure charge/discharge current ratings of the batteries meet the inverter’s DC input current at 16 kW continuous and any surge power.

**Backup & transfer**

* If the unit is used for backup, include an automatic transfer switch (ATS) sized for 120/240 V split-phase loads and a safe islanding scheme per electrical code.

* Consider an external critical-load subpanel so essential circuits are separated from non-critical loads.

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Protection, safety & balance-of-system

* DC disconnect(s) between PV array and inverter, with proper fusing for each string.

* DC breaker/fuse between batteries and inverter per battery and inverter manufacturer recommendations.

* AC breakers on each phase: main breaker and branch breakers for loads.

* Surge protection devices (SPD) on both DC and AC sides.

* Proper earthing/grounding and lightning protection as local code requires.

* Ventilation/clearance for inverter and battery cabinet — lithium batteries typically require thermal management and spacing per manufacturer.

* Rapid shutdown (where required by code) for rooftop arrays.

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Monitoring, communications & firmware

* Inverter should provide Wi-Fi/Ethernet (and often RS485) for monitoring. Recommend a cloud portal + local display for real-time stats (PV production, battery SoC, loads).

* Firmware update capability and remote diagnostics will save time in maintenance.

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Mechanical & installation considerations

* 24 panels: decide roof vs ground mount. Roof area and tilt should allow \~24 panels of the chosen footprint; 700 W panels are large, so confirm layout with roofer/structural engineer.

* Array orientation & tilt: optimize for location and customer goals (peak production vs seasonal).

* Cable runs: minimize DC cable length to reduce losses; use appropriately sized conductors for inverter and battery DC currents.

* Weight & mounting: check roof loading and wind/earthquake requirements; use waterproof flashing for roof penetrations.

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Optional add-ons (useful for upsell / better UX)

* Hybrid meter / whole-home energy meter for accurate self-consumption optimization.

* Generator auto-start interface for extended outages.

* Smart load management / critical-load shedder to preserve battery for essentials.

* Additional battery modules if longer backup required.

* EV charger integration and load scheduling.

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Warranty & lifecycle expectations

* Check Solis inverter warranty (typical 5–10 years, extendable).

* Battery warranties vary (cycle-based or capacity retention over years). Ask supplier for cycle life, warranty % retained capacity (e.g., 70–80% after X years) and end-of-warranty capacity guarantee.

* PV modules often 10-12 year product warranty and 25 year performance warranty — confirm with panel maker.

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Quick spec summary (one-page)

* PV: 24 × 700 W = 16.8 kW array

* Inverter: Solis 16 kW split-phase (120/240 V) hybrid / ESS capable

* Battery: 2 × 16 kWh (48 V) → 32 kWh nominal/25.6 kWh usable@ 80% DoD (example)

* Typical daily PV yield (net, 80% factor): 40–80 kWh/day depending on 3–6 PSH

* Full inverter backup duration (at 16 kW): **\~1.6 hours; at 5 kW average load: ~5.1 hours.