The Customer Asks for Two Settings Changes

Correct answer: D) The reserve state of charge, on the owner’s recorded instruction. The export limit is a curtailment setting the system was configured to honour for the utility, so it is not the owner’s to authorise

Two settings in the same menu can belong to two different people. The backup reserve is a statement about how the owner wants to use their own storage: how much they are willing to hold back against an outage versus how much they want working for them day to day. That is theirs to decide, and your part is to carry out the instruction, record who gave it, and tell them what they are giving up.

The export limit is a different kind of number. It is there because something outside the site requires the system not to push more than a certain amount onto the network, and the system was configured to honour that. The customer believing they are losing money does not change what was agreed, and raising the limit would not be a favour to them, it would be putting them in breach of something they signed and putting you in the position of having done it.

Which brings up the distinction the question is really about. Installer-level access tells you what you are technically able to change. It tells you nothing about what you are permitted to change. Holding the password is the beginning of the question and people routinely treat it as the end of it, particularly when a customer is standing there and the change takes fifteen seconds.

A note on vocabulary: the document behind an export limit is usually called an interconnection agreement, and that term does not appear in the JTA. What the JTA does name is export limitation, as a form of system curtailment, and system programming and controls, as something governed by the manufacturer's manuals and specifications. Both of those point the same way: these are configured functions with a reason behind them, not preferences.

The O&M point: nobody asks the commissioning crew to change a setting on the way out, because on the day of commissioning everything was just decided and written down. You are the one who turns up afterwards, repeatedly, with the access, at a moment when the person asking has had a year to develop an opinion about their electricity bill. That is the situation this judgement exists for.

Why the other options are wrong

A) Both — the technician has the access, and settings inside the customer’s own equipment are the customer’s to set

This collapses two different questions into one, and the collapse is the error worth naming: having access is not having authority. It is also true that the equipment belongs to the customer, and what that gets them is authority over the settings that express their own preferences. It does not extend to a setting that exists because of an undertaking to somebody else, any more than owning a car lets you change what its emissions certification says.

B) Neither — changing any programmed setting on a commissioned installation voids the manufacturer’s warranty

This is over-caution dressed as diligence, and it would make the system unmaintainable. A battery system is meant to be configured; the manufacturer supplies the settings and documents them, and adjusting a reserve level within the documented range is ordinary work rather than tampering. Refusing everything is easy to defend in the moment and leaves a customer with a system that cannot be adapted to how they actually use it.

C) The export limit only; the reserve state of charge is locked by the manufacturer because it affects the battery’s warranty terms

This gets both halves backwards, which is what makes it worth including. The reserve level is the adjustable one, offered to owners precisely so they can trade backup duration against daily use, and the export limit is the one that is not the owner's to move. Answering from a general sense that manufacturers lock things and utilities do not is how the two end up swapped.

References

• NABCEP OMAT JTA v.2026.5 — Domain 3, Task 4.B: "Manufacturer manuals and specifications (e.g., installation manuals, system programming and controls, product safety guidelines)"
• NABCEP OMAT JTA v.2026.5 — Domain 4, Task 4.E: "System curtailment (e.g., export limitation, load control)", which is where export limiting is named. The trade term "interconnection agreement" does not appear anywhere in the JTA and is used in the explanation as background only, in the same way as other terms the blueprint does not name.