Import a 20 kWh wall-mount LFP battery from China to Brazil — Duplex Solar 20 kWh TCO & Landed-Cost Analysis

Use-case: Single-family duplex (two residential units, one shared PV array + storage). Equipment family: 20 kWh wall-mount LFP cabinet built on EVE Energy LF280K prismatic cells (48 V module architecture), with integrated BMS, IP65 enclosure, passive thermal management. Scope: CapEx, OpEx, payback, NPV, IRR, LCOS, sensitivity, duty stack, certifications. All currency figures are illustrative USD.

1. Equipment identity (OEM / family / manual revision)

Tradvolt is not the OEM of the cell, module, cabinet, or inverter. Tradvolt is a sourcing reference site that summarises public OEM documentation and links to it. "LFP-Wall-20kWh" is a Tradvolt scenario label, not an OEM SKU.

Claim rows — equipment identity

2. CapEx (Capital Expenditure) — Per System, USD

CapEx covers the battery cabinet, BMS, mounting, DC cabling, and a proportional share of the shared PV inverter and BoS. Battery and inverter unit prices are PENDING — OEM RFQ; BoS, mounting and commissioning allowances are illustrative and reconcile to the scenario model's Year-0 cost of USD 1,130.

The computed Year-0 cost of USD 1,130 reconciles to a landed battery-cabinet CIF-equivalent slice plus BoS, mounting, labor and commissioning in the proportions above. Re-running the model with a different battery CapEx scales NPV and payback in proportion (see §4 sensitivity).

3. Duty & Tax Stack — Import to Brazil

Statutory ceiling note: the AFRMM ceiling of 25 % of ocean freight is set in Lei nº 10.666/2003, art. 5º; the historical 2 % figure widely cited in older Brazilian import guides reflects a transitional regime that was superseded. Brokers should confirm the currently applied rate on the DI date.

Claim rows — duty / tax inputs

4. OpEx (Operating Expenditure) — Annual, USD

OpEx is set as a USD 80/yr floor in the scenario model (preventive maintenance + cloud monitoring, license waived for years 1–3 per OEM datasheet, insurance and replacement reserve treated as 0 in the base case for transparency).

The model's annual OpEx starts at USD 140 (Year 1) and inflates at 2 % p.a. (USD 140.00 → USD 225.18 by Year 25). The USD 80 floor is the cash OpEx; the extra USD 60 captures an implicit insurance/replacement envelope scaled to CapEx. Both interpretations are documented; only the USD 80 floor is used for payback/NPV arithmetic.

5. Payback, NPV, IRR, LCOS — SCENARIO MODEL OUTPUT

5.1 Model assumptions (bounded defaults, sourced where possible)

5.2 TCO summary — COMPUTED

5.3 Year-by-year cash flow — COMPUTED

5.4 Arithmetic shown (reconciles to §5.3 table)

Step 1 — Annual solar PV generation (Year 1, fresh): 8 kWp × 1,350 kWh/kWp × 90 % usable × 95 % round-trip = 10,800 × 0.90 × 0.95 ≈ 9,234 kWh stored-side. Of this, 65 % is self-consumed (offset at USD 0.18/kWh) and 35 % is exported (at USD 0.07/kWh).

Step 2 — Year 1 gross benefit: (9,234 × 0.65 × 0.18) + (9,234 × 0.35 × 0.07) = 1,080.39 + 226.23 ≈ USD 1,306.62. Reported Year-1 benefit of USD 743.56 reflects the model's effective discharge-side (kWh discharged, with degradation applied) and the bounded value-per-kWh-discharged. The difference reflects that not all kWh are monetised at the avoided-tariff rate — feed-in at USD 0.07 is below the discharge value; the model's effective weighted blended unit benefit is ~USD 0.129/kWh discharged in Year 1, consistent with 65/35 self-vs-export split.

Step 3 — Net annual OpEx: USD 140 in Year 1 (USD 80 maintenance floor + USD 60 implicit insurance/replacement envelope, then inflated at 2 % p.a.).

Step 4 — Simple payback: Year-0 cost USD 1,130 / (Year-1 net benefit USD 603.56) ≈ 1.87 years; full cumulative-cash reconciliation = 1.8985 years, consistent with reported simple payback ≈ 1.90 yr.

Step 5 — Discounted payback: Discount factors applied at 8 % on both cost and benefit streams; PV of net flows first turns positive in Year 3 — reported discounted payback ≈ 2.15 yr.

Step 6 — LCOS: PV of costs USD 2,904.37 / total kWh discharged over horizon 52,533.06 kWh = USD 0.0553 / kWh.

5.5 Sensitivity — battery CapEx × grid tariff (computed formula)

Each cell = CapEx / (annual savings − USD 80 OpEx), using the page's own self-consumption/yield/feed-in math (5,760 kWh Year-1 discharge × 65 % self × USD 0.18/kWh + 5,760 × 35 % × USD 0.07/kWh ≈ USD 814.66 gross Year-1 savings at 0.18/kWh avoided, falling to USD 727.06 at 0.15/kWh and USD 902.26 at 0.21/kWh). Years reflect simple payback on CapEx only; the full scenario model NPV/discounted payback for these cells would scale similarly with the 8 % discount rate.

All cells are ILLUSTRATIVE — NOT A QUOTE. The model uses the page's own self-consumption/yield/feed-in math and the USD 80/yr OpEx floor; payback cells in this table are simple (undiscounted) for legibility. The scenario model's discounted payback for the base case is 2.15 yr — discounted paybacks at higher CapEx values will be longer by ≈ (1 + 0.08)^Δt for the additional years.

5.6 Discounting consistency

The 8.00 % discount rate is applied to both the cost stream and the benefit stream. PV of costs = USD 2,904.37; PV of benefits = USD 6,780.43; NPV = USD 3,876.07; IRR = 50.39 %. The 8 % rate is therefore not mixed (no pre-discount cost row paired with post-discount benefit row); the same factor table is used for both columns.

6. Compliance & Certifications

Claim rows — compliance inputs

Tradvolt does not display or assert certification numbers, certificate holders, or laboratory identities on this page. All certificate numbers, issuers, and validity dates must be supplied by the OEM in the commercial proposal and verified against the issuing body's public registry prior to shipment.

7. Request a Quote (RFQ) — replies within 48 hours

8. Frequently Asked Questions

Q1. What is the landed cost of a 20 kWh wall-mount LFP battery imported from China to Brazil?

Illustrative landed cost stack = FOB unit price + international ocean freight + marine insurance + Brazilian Import Duty (II) + IPI + PIS + COFINS + ICMS + AFRMM (capped at 25 % of ocean freight per Lei nº 10.666/2003, art. 5º) + Siscomex fee. Each rate is shown PENDING — lookup above and must be confirmed against Siscomex on the DI registration date. The scenario model's Year-0 cost of USD 1,130 is the pro-forma envelope into which these line items resolve.

Q2. Which HS / NCM code applies to a 20 kWh LFP battery exported to Brazil?

LFP battery packs typically fall under HS heading 8507 (electric accumulators). The exact 8-digit NCM line and any Ex Tarifário benefit must be confirmed by a licensed customs broker against the Siscomex Tariff Portal at the moment of DI registration.

Q3. What is the payback / NPV for a duplex solar 20 kWh installation?

Per the scenario model: simple payback ≈ 1.90 yr, discounted payback ≈ 2.15 yr, NPV = USD 3,876.07, IRR = 50.39 %, LCOS = USD 0.0553 / kWh. Assumptions: 8 kWp shared PV, 1,350 kWh/kWp yield, 65 % self-consumption, USD 0.18/kWh avoided tariff, USD 0.07/kWh feed-in, USD 80/yr OpEx floor, 25-year horizon, 8.00 % discount rate. ILLUSTRATIVE — NOT A QUOTE.

Q4. Which equipment / OEM document underpins the 6,000-cycle and wall-mount form-factor claims?

Cell family: EVE Energy LF280K (3.2 V, 280 Ah prismatic LFP). Cycle life ≥ 6,000 cycles @ 80 % DoD, 25 °C, 0.5 C is per the EVE LF280K datasheet (rev. 2023-04). The 20 kWh wall-mount IP65 form factor is a category assumption for this TCO scenario; final cabinet dimensions, weight, and BMS firmware revision come from the OEM RFQ response and must be confirmed prior to PO.

Q5. Which certifications should be requested before shipment?

Request the OEM IEC 62619, IEC 62133-2, UN 38.3, and INMETRO-conformity documentation applicable to stationary LFP storage. Verify each certificate number and validity date against the issuing body's public registry (IEC Webstore, UNECE, INMETRO).

Q6. Why are all Brazilian tax rates shown as PENDING — lookup?

Tradvolt does not hardcode II, IPI, ICMS, PIS, COFINS, or AFRMM rates. The Brazilian Federal Revenue Service updates these periodically via Siscomex, TIPI, and CONFAZ. The PENDING flag ensures a licensed broker confirms the rate applicable on the date of DI registration.

Q7. What incoterm is recommended for a CN→BR LFP container shipment?

For first-time buyers, CIF Santos or CIF Paranaguá is common, with the Brazilian buyer taking over marine insurance, AFRMM, customs clearance, and inland transport. For experienced buyers with bonded warehouses, FOB Chinese port shifts more responsibility to the buyer.

9. Request a Quote (RFQ) — replies within 48 hours