Hacker News 의견

Here's a summary of the key points from the Hacker News comments:

• Landlord Concerns: Many commenters expressed doubts about whether most landlords would approve of this setup due to potential code violations, fire hazards, roof damage, and liability risks.

• Safety Issues:

  • The exposed wiring and bare terminals of the lithium battery pack are major safety concerns.
  • The long, tacked-up cabling likely violates electrical codes.
  • Insurance might not cover fires or damages caused by this DIY setup.

• Suggested Improvements:

  • Use a self-contained outdoor box rated for high-energy batteries, with an integrated inverter and PDU.
  • Plug the panels into this box and only bring it inside during outages.
  • Consider purchasing a properly engineered, portable "battery generator" instead.
  • Add sandbags to the panels to prevent them from blowing off the roof in high winds.

• Cost-Effectiveness: Despite the safety issues, the low cost of this setup is impressive. In areas with high electricity rates like San Francisco ($0.55/kWh), the payback period could be as short as one year.

• Alternative Approaches:

  • Buy decommissioned commercial solar panels for even greater cost savings.
  • Use a large power brick that doesn't require solar access for backup during outages.
  • Pair a small chest freezer with a power brick for food storage during outages.
  • Set up an off-grid solar system to charge an electric vehicle without connecting to the house or grid.

• Necessary Addition: Commenters emphasized the need for hardware to securely fasten the panels to the roof to prevent wind damage.