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Automated design

Off-grid PV system — 2.5 kWp / 19.2 kWh

Live engineering

Daily PV yield

9.4 kWh

Array × sun hours × 0.75 derate

Solar coverage

117%

Yield ÷ daily demand

DC/AC ratio

0.71

PV kWp ÷ inverter kVA

Usable storage

15.4 kWh

Bank × 80% DoD

Real autonomy

1.8 days

Usable storage ÷ daily load

Battery C-rate

0.20 C

Inverter DC current ÷ bank Ah

Accuracy checks

6/7 passed
  • Cold string Voc115 V vs 150 V limit
  • Hot string Vmp74 V estimated hot vs 57.599999999999994 V MPPT minimum
  • Energy balancePV covers 117% of daily demand
  • DC/AC ratio0.71 (target 0.8–1.4)
  • Battery discharge0.20 C vs 0.5 C recommended
  • Cable voltage dropWorst circuit 2.71%
  • Battery voltage match4 × 12 V on 48 V bus

Equipment optimizer

Tests every MaxProtech panel, inverter and battery combination against your load and ranks the leanest safe fits.

#1 · 2.50 kWp / 14.4 kWh

4 × RED SOLAR 625W

Solis S6-EH1P3K-L-PLUS (3 kW) · 12 × Maxpower MP 1200 Alpha

#2 · 2.50 kWp / 14.4 kWh

4 × RED SOLAR 625W

Solis S6-EH1P3K-L-PLUS (3 kW) · 6 × Maxpower MP 2500 Alpha

#3 · 2.50 kWp / 14.4 kWh

4 × RED SOLAR 625W

Solis S6-EH1P3K-L-PLUS (3 kW) · 3 × Maxpower MP-5000 Alpha

Single-line diagram

PV ARRAY4 × 625 W2S × 2P2.50 kWpVoc 100 V · Isc 31.3 ACOMBINER BOX2 × 25 A gPV fuseSPD Type II DCDC isolator 50 AHYBRID INVERTER3.5 kVA · η 92%Built-in MPPT charge controllerPV Voc ≤ 150 VBattery 48 V DCOutput 230 V ACBATTERY BANK8 × 12 V 200 Ah4S × 2P LiFePO448 V · 400 Ah19.2 kWhAC DISTRIBUTIONMCB 20 ARCD 30 mALoad 2500 W peakPV1-F16 mm² (6 AWG)PV DC16 mm² (6 AWG)2.0% VdBattery DC ↔ inverterFuse 100 A25 mm² (4 AWG)230 V AC2.5 mm² (14 AWG)PE / Earth bonding 6 mm² green-yellowDC circuitAC circuit

Connection diagram

PV STRINGS — 2 in series × 2 parallelS1: 84 V · 14.73 A · fuse 25 AS2: 84 V · 14.73 A · fuse 25 ACBBATTERY BANK — 4S × 2P12V+−12V+−12V+−12V+−12V+−12V+−12V+−12V+−Busbar cable 25 mm² (4 AWG) · equal-length links

Equipment schedule

PV array4 × 625 W = 2.50 kWp (2S2P)
String Voc / cold Voc100.4 V / 115.5 V
Integrated solar chargingBuilt-in MPPT · PV Voc limit 150 V
Battery bank8 × 12 V 200 Ah → 48 V 400 Ah (19.2 kWh)
Hybrid inverter3.5 kVA, DC input 79 A · built-in charge control

Cable & protection schedule

CircuitI (A)SizeRunVdOCPD
String cable19.66 mm² / 10 AWG20 m2.71%25 A
PV → hybrid inverter39.116 mm² / 6 AWG20 m2.03%50 A
Battery → hybrid inverter79.325 mm² / 4 AWG3 m0.69%100 A
AC output15.22.5 mm² / 14 AWG15 m1.39%20 A

Ratings use 25% safety margins and a 3% voltage-drop limit. Verify against applicable IEC/NEC standards before installation.