Path-Q Solar
What battery-quote details should I request before deciding whether adding a battery is worthwhile?
Answer
Request a battery quote that separates equipment, installation, controls, warranty, usable capacity, power output, operating limits, and expected performance. Also require modeled outcomes for the specific purpose you care about, such as outage backup, bill management, or reducing export, rather than relying on the battery's nameplate capacity alone.
Key points
- Ask for usable energy capacity, continuous and peak power, backup duration assumptions, and which loads are supported.
- Require the proposed operating strategy, including reserve capacity and whether the battery can charge from the grid.
- Compare total installed cost, recurring costs, warranty terms, degradation assumptions, and replacement responsibility.
- Request assumptions about solar production, household load, outages, and any utility or program restrictions.
What it depends on
- Primary purpose of the battery
- Critical loads and their starting or surge requirements
- Solar production and household-load profile
- Battery and inverter compatibility
Risks and trade-offs
- A larger battery may not provide proportional value if it is rarely cycled or cannot recharge as expected.
- Backup claims can be misleading if high-load appliances are excluded or startup loads exceed inverter capacity.
- Performance, warranty, and service terms may differ substantially between otherwise similar quotes.
Information you may need
- Itemized installed price and any ongoing charges
- Usable capacity, power ratings, reserve settings, and backup circuits
- Warranty coverage, degradation terms, and service response process
- Modeled annual savings or outage performance with stated assumptions
Your next step
What to do next
Use a written comparison table and ask each installer to complete the same battery-quote fields before deciding.
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