Received an Error Message: R891 Your service disconnect rating is smaller than 60A.

Error Message Received:

Typical Causation:

This error is usually caused by an input of under 60 amps for the service disconnect (main breaker in most cases). In most cases, this is a simple input error stemming from switching the system interconnection breaker size and the service disconnect size.

An Example:

Consider the following example where a user had switched the combiner panel breaker sizes with the service panel within the SolarAPP+ application.

Explanation

In this case, an error arose because, for busbar #1 (the main service panel), a 125-amp bus was mistakenly entered with a 50-amp breaker protecting it. This configuration did not align with the plans, which specified a 225-amp bus protected by a 200-amp main breaker and was the result of accidentally swapping the service panel's details with the combiner box.

Potential Solution(s)

As a solution, unless the service disconnect or main breaker truly is under 60A, the SolarAPP+ inputs should be adjusted accordingly to reflect the plan set.