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SOLAR PV

8 kW rooftop solar with battery backup

This residential solar PV single line diagram shows a practical hybrid system for a home that needs ordinary grid operation and limited outage backup. The rooftop array passes through a DC disconnect to a hybrid inverter, while a lithium battery supplies the inverter on its DC side. The inverter lands through an AC breaker at the main service panel, with a separate feeder serving critical loads.

UPDATED 2026-09-23
TYPESld
USE-CASESolar Pv Sld
EXAMPLE8 kW rooftop solar with battery backup
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CASE ANALYSIS

Scenario

A homeowner needs a permit-ready overview of a grid-connected rooftop system that can keep selected circuits energized during an outage.

Key decisions

  • The 8.0 kWdc array feeds a 7.6 kWac hybrid inverter through a 600 Vdc disconnect.
  • The battery connects on the inverter DC side using a 48 V, 13.5 kWh rating.
  • A 40 A AC breaker lands at the 240/120 V main service panel.
  • Only the critical-load panel sits behind the 60 A backup feeder.

When to reuse this

Use this layout for a single-phase home with selected backup loads. Final conductor and overcurrent sizing must be confirmed for the installed equipment and local code.

FAQ

Frequently asked questions

Why is the battery connected to the hybrid inverter?01
A hybrid inverter manages both PV production and battery charging or discharge in this DC-coupled arrangement.
What is on the critical-load panel?02
It commonly contains selected lighting, refrigeration, communications, and receptacle circuits sized within the backup capability.
Is this a construction drawing?03
It is a clear system concept; the final permit set needs site-specific protection, grounding, and conductor details.
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