Which warranty term applies to my site, 3 years or 18 months?

It turns on the average day ambient where the batteries actually sit, not the room's design temperature or the thermostat setpoint. Take a reading across a full duty cycle in the warmest season. At or below 77°F you are in the 3-year tier. Above that and up to 95°F you are in the 18-month tier. Send us the figure and we will put the applicable term on the quote in writing so there is no argument later.

How is a 15-year design life different from the warranty?

Design life is NorthStar's engineering estimate of how long the cell can serve under ideal float conditions. The warranty is the period they will replace a failed unit. The gap between the two is normal across the industry and it is not a catch, but any seller quoting you a design life as though it were a warranty is either careless or hoping you will not check.

What happens if a cabinet runs hotter than 95°F?

Coverage is void once cell temperature passes 95°F for more than 30 days in a 365-day period, so a cabinet with a failed fan can cost you the warranty before it costs you the battery. If you know a site runs hot, say so up front and we will talk about whether a high-temperature line is the better buy.

How do I confirm the NSB190FT RED is the right battery before ordering?

Send a photo of the label on the unit you are replacing plus the tray dimensions. Voltage, terminal type and footprint are the three that have to match, and the M8 front terminal is the detail most often missed. We would rather talk you out of the wrong battery than process the return.

Why is there a four-unit minimum order?

Each battery weighs 123 lbs and moves by freight, so a single-unit shipment costs nearly what four cost. The minimum keeps the per-unit freight sane and matches how these strings get built anyway.