ROI CALCULATOR

Stop Renting Your Power.

Calculate your exact savings by storing cheap night-time energy to use during expensive peak hours.

1. Monthly Usage

600 kWh
Estimating configuration for:~600 kWh/month

2. Shift Strategy

3. Inverter Power

1x Units
Daily Storage Required
0 kWh
Battery Units (+1 Safety)
0 (0kWh)

Status Quo (Block Tariff)

600 kWh Standard Grid Draw
LKR 0

New Estimated Bill

Switching to ToU Tariff + BESS
LKR 0

Instantly drop your bill by 0% and secure 0kWh of blackout protection.

Battery Sizing0 Units
Est. Equipment CostLKR 700,000
Monthly Cash Kept in Your Pocket:LKR 0
Break-Even ROI
N/A Yrs
*These calculations utilize baseline CEB mathematics current as of August 2026. ROI velocity is modeled conservatively. As national tariffs historically rise, your system will pay for itself significantly faster than anticipated.
Engineering Backend

BESS Internal Architect

Step 1: Network & Demand Load

5 kVA (21.74A)

Step 2: BYD LV5.0 Storage

10 kWh/Day300 kWh/Month
1 Unit2 Units Selected32 Units

Step 3: Select Inverter

Deploying 1x Units

Engineering Validation

▼
1. Peak Demand Check:5kVA ≥ 5kVA ✓
2. Minimum Module Check:2x ≥ 2x ✓
3. ToU Charge Window:2.79h ≤ 7.0h ✓
Inverter DC Charge Output:1 × 70A = 70A
Battery Acceptance Limit:2 × 70A = 140A
Effective Charge Current:min(70, 140) = 70A
Charge Power (kW):(70A × 51.2V) ÷ 1000 = 3.58 kW
Time to Full Charge:10kWh ÷ 3.58kW = 2.79 Hours

Step 4: Financial Summary

✓ Verified System
2x BYD LV5.0 Storage Units:LKR 1,400,000
1x MultiPlus-II Inverters:LKR 700,000
Total HardwareLKR 2,100,000
BECO Electrical Engineering • Solar, BESS & Critical Power Architecture
🛡️ UK Level 3 EAL Certified✓ Configuration Validated

Victron Off-Grid System Designer & ROI Estimator

1x MultiPlus-II 48/6k5/100-50 GX (1P) • 4x BYD LV5.0 (20 kWh) • 9.92 kWp PV
Daily Target: 40.0 kWh/day
1x Inverter Unit Configured
Pre-loads optimal PV, Inverter & BYD bank
Interactive Day / Night / Genset Schematic
Recommended PV Array
9.92 kWp
16x 620W Panels (4S × 2P × 2 MPPTs)
Daily Yield: ~36.7 kWh/day
BYD LV5.0 Usable Storage
20.0 kWh
4x BYD LV5.0 Modules (100% DoD LFP)
Max Continuous: 280A (14.3 kW)
Victron Inverter (1P)
6.5 kVA / 6.0 kW
1x MultiPlus-II 48/6k5/100-50 GX
⚡ Max Export: 26A ea. | 26A Total
Monthly Generation (Daily × 30)
1,100 kWh
Target Load: 1,200 kWh (Buffer: +0 kWh)
Tariff Value: LKR 102,859/mo
🛠️

1. Hardware, Inverter & Storage Configuration

🔋 BYD Battery-Box LV5.0 (Max 32):
4× LV5.0 (20 kWh)
• Off-Grid Inrush Rule: MultiPlus-II 48/6k5/100-50 GX (1P) requires at least 2× BYD LV5.0 modules (10 kWh).
☀️ Day Load: 40% (16.0 kWh)🌙 Night Battery Load: 60% (24.0 kWh)
⏱️

2. Recharge Telemetry & Generator Sizing

Total Monthly Generation (Daily × 30):1,100 kWh / mo
Max Export Current (Individual / Total):26 A / 26 A (1P)
Total Solar DC Charge Current OUT:173 A (9.5 kW)
Solar Recharge (Daily Night Cycle Recovery):3.0 Hours
Solar Recharge (0% → 100% Full Bank):2.5 Hours
Inverter AC Charger Rate (MultiPlus-II):100 A DC (5.5 kW)
AC / Genset Recharge (Daily Night Cycle):4.3 Hours
AC / Genset Recharge (0% → 100% Full Bank):3.6 Hours
Recommended: 15 kVA (1P)
EXACT NEEDED:
12.1 kVA (9.7 kW)
RECOMMENDED TIER:
15 kVA (12 kW)
Standard tiers: 10, 15, 20, 25, 30, 40, 50, 60, 80 kVA.

Victron Off-Grid Solar & Storage Designer

Off-Grid Sizing • Victron MultiPlus-II (1P) • BYD LV5.0 Storage • SmartSolar MPPTs
✓ All BYD & Victron Validations Passed
Target Daily: 40.0 kWh/day
1x Inverter Unit
Pre-loads optimal PV, Inverter & BYD modules
Recommended PV Array Size
9.92 kWp
16x 620W Panels (4S x 2P x 2 MPPTs)
Daily PV: ~36.7 kWh/day
BYD LV5.0 Usable Storage
20.0 kWh
4x BYD LV5.0 Modules (100% Usable LFP)
Max Continuous: 280A (14.3 kW)
Victron Inverter (1P)
6.5 kVA / 6.0 kW
1x MultiPlus-II 48/6k5/100-50
⚡ Max Export: 26A (Indiv) | 26A (Total 1P)
Monthly Production vs Target
1,100 kWh / mo
Target Load: 1,200 kWh/mo (Surplus: +0 kWh)
Daily Generation x 30 = 1,100 kWh

🛠️ Customise Hardware, Inverter & Storage

🔋 BYD Battery-Box LV5.0 Modules (Max 32):
4x LV5.0 (20 kWh)
• Off-Grid Technical Minimum Rule: MultiPlus-II 48/6k5/100-50 (1P) requires at least 2x BYD LV5.0 modules (10 kWh) to handle inverter peak inrush loads.
☀️ Day Load: 40% (16.0 kWh)🌙 Night Battery Load: 60% (24.0 kWh)

⏱️ Battery Recharge Times & Generator Sizing

Total Daily Solar Generation:~36.7 kWh / day
Total Monthly Generation (Daily x 30):1,100 kWh / mo
Max Export Current (Individual Inverter):26 A
Max Export Current (Total 1P):26 A
Total Solar DC Charge Current OUT:173 A (9.5 kW)
Solar Recharge (Daily Night Cycle Recovery):3.0 Hours
Solar Recharge (0% → 100% Full Bank):2.5 Hours
Inverter Charger Rate (MultiPlus-II):100 A DC (5.5 kW)
AC / Genset Recharge (Daily Night Cycle Recovery):4.3 Hours
AC / Genset Recharge (0% → 100% Full Bank):3.6 Hours
Battery Autonomy Without Sun or Generator:11.7 Hours
Rec: 15 kVA (1P)
EXACT NEEDED CAPACITY:
12.1 kVA (9.7 kW)
RECOMMENDED STANDARD SIZE:
15 kVA (12 kW)
• Sizing Basis: Selected from standard industry tiers (10, 15, 20, 25, 30, 40, 50, 60, 80 kVA).
• Simultaneous Power & Charge: Comfortably supplies 1.6 kW house loads while powering the MultiPlus-II charger at 5.5 kW (100A DC) to replenish 100% of the BYD bank in 3.6 hours.
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Victron MPPT Sizing Calculator

✓ Configuration Accepted
Total PV Array Power
2.48 kWp
2,480 Wp (4 Panels: 2S × 2P)
DC Current IN (From PV)
30.8 A
Isc: 32.3 A (Controller Max Isc: 70 A)
DC Current OUT (To 48V Battery)
42.0 A
Max Hardware Limit: 100 A

1. PV Module & Array Setup

📊 Max Allowed Strings for Selected MPPT @ 10°C Min:
• Max Single String Length (Series $N_s$): Up to 4 panels in series (Max Voc limit 250V).
• Max Parallel Strings ($N_p$): Up to 2 parallel strings (respecting controller 70A Isc limit).

2. Detailed Voltage & Current Telemetry

Max Controller Input Voltage:250 V
PV Max Voc @ 10°C:100.8 V
Min MPPT Operating Voltage (Run / Start):49 V / 53 V
PV Min Vmpp @ 70°C (incl. cable drop):66.4 V
PV Array DC Current IN (Impp / Isc):30.8 A / 32.3 A
Max Controller Hardware Limit OUT:100 A
Calculated Max DC Charge Current OUT:42.0 A
Voltage Window vs. Temperature (V)
Max Input Limit (250V)Min MPP (49V)

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