DIY Battery Pack with Sol-Ark Inverter, Whole Home Backup

Project Details:

• LFP prismatic cells (REPT 280Ah)
• 16S2P configuration, 51.2V nominal, 560Ah (~28kWh Capacity)
• Nuvation BMS and custom stack switchgear – view options
• Compression end plates – view product
• Custom bus bars – view options
• Sol-Ark 12kW hybrid inverter – manufacturer site
• 5kW AC-coupled solar (Enphase micro-inverters)
• 3kW DC-Coupled solar (To Sol-Ark MPPT)
• Application:
  • Time-of-Use optimization
  • Recharge with solar only
  • Zero grid draw 5pm–8pm
  • Whole-home backup

📺 Watch the Full DIY Build Series

This six-part video playlist documents the entire build from start to finish—designing, assembling, and commissioning the system in Joshua Tree. Follow along to see each step in detail.

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🧰 Step-by-Step Build

Design it First

Final Layout

Wall Planning

Cell Assembly: Compression Plates First

Progress Update

BMS Configuration

Sol-Ark Programming

Final Install Photos

💡 Why This Matters

• Lower utility bills by avoiding peak rates
• Charge batteries with solar only or when utility rates are low
• Whole home backup with Sol-Ark
• Built using parts available on OGSolarStore.com

⚡ Want to Save Even More?

This follow-up video shows how we fine-tuned the Time-of-Use settings on the Sol-Ark inverter to slash energy bills even further. If you’ve already installed your system, this is a must-watch!

Inspired to build your own system? You can find all the same components—from REPT cells to bus bars and compression plates—right here on OGSolarStore.com. Let’s build something smart together. 🛠️