MARINE/RV

Step 1: Calculate Total Daily Energy Consumption (Load Assessment)

The core of an off-grid system is precise alignment with your actual energy needs. To determine this, you must calculate the total daily consumption in kilowatt-hours (kWh).

Above is a detailed calculation based on common household appliances. 

Total Daily Consumption: 13.5 kWh. This figure is the baseline for sizing your battery bank and solar array.

Step 2: Sizing the Off-Grid Inverter for Peak Power Loads

Your inverter must be powerful enough to handle the Peak Load—the maximum power surge when all devices are turned on simultaneously.

Calculating Total Peak Power

Sum the maximum power rating of all appliances to find the required inverter capacity:

• Induction Cooker: 2kW × 1 = 2kW
• Refrigerator: 0.15kW × 1 = 0.15kW
• Lighting: 0.05kW × 10 = 0.5kW
• Washing Machine: 0.4kW × 2 = 0.8kW
• TV: 0.3kW × 3 = 0.9kW

Total Peak Power Demand: 2 + 0.15 + 0.5 + 0.8 + 0.9 ≈ 4.35 kW

Recommended Solution: 12kW Inverter for future expansion. 

For comparison a Tesla Powerwall has a Capacity of 13.5KWh with a Peak Power (Power Rating) of 11.5 KW.

ANENJI

Step 3: Determining Solar Panel Quantity & Voltage Configuration

Your solar panel array must meet two criteria: generating enough daily energy (kWh) and staying within the inverter's MPPT voltage range (Voltage Open Circuit).

Matching PV Input to Inverter MPPT Voltage

For a high-efficiency system, high-voltage series connections are often used. Assuming an inverter limit of 600V:

• Single Panel Specs: 550W Power, 41V Operating Voltage.
• Calculation Formula: Total Voltage = Single Panel Voltage × Number of Panels.
• Verification: 41V × 6 panels = 246V.

Result: 246V is < 600V, which is within the safe and efficient operating range.

Recommended Configuration: 6 × 550W Solar Panels.

• Total Capacity: 3.3 kW.
• Daily Generation: Approx. 16.5kWh (for 5 sunlight hours), fully covering the 13.5 kWh daily demand.

SUNGOLDPOWER        Ground Mount

Step 4: Calculating Storage Battery Capacity & Depth of Discharge (DoD)

Battery capacity calculation must account for the Depth of Discharge (DoD) to ensure battery longevity. You cannot drain a battery to 0% every day without damaging it.

The Formula for Battery Sizing

For a Lithium Iron Phosphate (LiFePO4) system, we typically use an 80% DoD calculation:

Formula: Required Capacity = Daily Consumption ÷ DoD (0.8)

Calculation:

13.5 kWh ÷ 0.8 ≈ 17 kWh.

The battery capacity (48V battery) must be: 17000 W/ 48V ≈ 355A.

JM Battery

Total Cost: $1,199 + $1686 + 3x$179 + $2,093 = $5,515

• EXPERPOWER 3.8KWh
• RENOGY 5.12KWh
• RICHSOLAR 400W
• ACOPOWER 200W
• ECOWORTHY 200W
• VEVOR 200W
• AUECOOR 800W
• RICHSOLAR 2560W
• VICTRON 5KWh
• VEVOR 400W

• AMPINV 40A
• ANENJI 60A
• RENOGY 40A
• ECO-WORTHY 40A
• REDODO 40A
• EPEVER 40A
• Victron Energy 50A
• DYNESS 40A
• EXPERTPOWER 40A
• ANENJI 80A
• Li Time 30A
• AIMS 40A
• EASUN 60A
• PowMr 45A
• PHOCOS 30A
• ACOPOWER 40A
• ECG 40A
• JINGSUN
• MUST 40A
• MPPSOLAR 60A
• RICHR SOLAR 30A
• SRNE 50A
• SOROTEC 40A
• SUG 20A
• WERCHTAY 30A
• WATTCYCLE 30A
• ZAMDON 40A

• Victor Energy
• Dabbsson
• RENOGY 50A
• BLUETTI 560W
• ABOK 500W
• LITIME 60A
• AFERIY 580W
• VEVOR 60A
• ECO-WHORTY 60A
• REDODO 40A
• JACKERY 600W
• ECOFLOW 800W
• ANKER 800W
• RICHSOLAR 50A
• SRNE 30A
• TTNERGY 60A
• ACOPOWER 40A
• OUPES

• DCHOUSE 12V 20A
• RICHSOLAR 12V 20A
• DUMFUME 12V 10A
• DAKOTA 12V 20A
• EPOCH 15A
• ECO-WORTHY 100A
• HUMSIENK 12V 20A
• LiTime (Inverter-Charger)
• REDODO (Inverter-Charger)
• RICH SOLAR 60A
• AMPINVT (Inverter-Charger)
• AIMS (Inverter-Charger)
• SUNGOLDPOWER (INV-CHARCH)
• XINDUN (INV-CHARCH)
• VATRER 12V 20A
• WATT CYCLE 12V 80A
• XANTREX 12V 60A
• YEAGULCH 12V 18A

• LiTime 500A
• Victron Energy 500A
• HUMSIENK 350A
• REDODO 500A
• RICH SOLAR 500A
• WATT CYCLE 500A