How to Wire Batteries in Series vs Parallel — Solar Battery Guide

How you wire your battery bank determines the system voltage and total capacity. Getting this right is critical for compatibility with your Deye hybrid inverter and for battery safety.

Series Wiring

Connecting batteries in series adds voltages while keeping capacity (Ah) the same. Example: four 12V 100Ah batteries in series = 48V 100Ah (4.8 kWh).

• Connect positive of battery 1 to negative of battery 2, and so on
• The first battery's negative and last battery's positive are your system terminals
• All batteries must be the same type, brand, and age

Parallel Wiring

Connecting batteries in parallel adds capacity while keeping voltage the same. Example: two 48V 100Ah batteries in parallel = 48V 200Ah (9.6 kWh).

• Connect all positive terminals together and all negative terminals together
• Use equal-length cables to ensure balanced current flow

Series-Parallel (Combined)

For larger banks, combine both methods. First wire groups in series to reach target voltage, then wire those groups in parallel for more capacity.

Deye Battery Configuration

Deye BOS-G LiFePO4 batteries are 51.2V modules that stack in parallel. Each module adds 5.12 kWh to your bank. Simply stack and connect up to 4 modules (BOS-G) or 8 modules (SE-G5.1 Pro). The built-in BMS handles all balancing automatically.

Safety Rules

• Never mix battery types, ages, or capacities in the same bank
• Use appropriately rated cables and fuses for the total current
• Always disconnect the inverter before reconfiguring batteries
• Wear insulated gloves — 48V systems can deliver dangerous current