Path-Q Solar

How should I proceed if one installer recommends a battery and another does not?

Answer

Ask both installers to analyze the same battery and no-battery cases using your actual load profile, outage objectives, solar design, and electricity-compensation assumptions. The disagreement may reflect different goals rather than a simple technical error.

Key points

  • A battery can provide backup, shift solar use to later hours, and potentially manage demand, but it adds cost, equipment, losses, maintenance, and replacement considerations.
  • A battery is less compelling when backup is not important, daytime solar use is already high, or the system can meet the objective without storage.
  • Backup requires more than a battery: the design must identify backed-up loads, required duration, and equipment limitations.
  • Require itemized assumptions and separate pricing for solar, storage, controls, and backup-related electrical work.

What it depends on

  • Whether backup power is a priority
  • Evening and overnight electricity use
  • Solar production timing and system size
  • Battery usable capacity and power output
  • Applicable utility compensation and interconnection rules

Risks and trade-offs

  • A battery may not provide whole-home backup or operate during a prolonged outage.
  • Storage adds conversion losses and future replacement risk.
  • Omitting storage can leave an unmet resilience or time-shifting goal.

Information you may need

  • Hourly or interval electricity use if available
  • Critical loads and desired outage duration
  • Both proposals' battery assumptions, warranties, and exclusions
  • The stated financial or resilience reason for recommending storage

Your next step

What to do next

Give both installers the same written objectives and request comparable scenarios for solar-only, solar-plus-battery, and backup-limited designs.

Path-Q

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Some details may depend on your location, installer, utility, incentives, regulations, or specific property.

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