Predictika · Solar tracker row quotes

An AI sales agent's solar tracker quote, checked before it goes out

An AI sales agent prepares a quote for a block of solar tracker rows: a tracker model, the modules and strings on each row, the string voltage, the site slope, wind, ground coverage and temperature range, and the total DC capacity of the plant. Before it goes out, the agent sends it to Predictika, which checks it against a declarative model of the NX Horizon, NX Horizon-XTR and NX Gemini trackers and returns a verdict, every reason and the DC capacity it computed.

Scope: Nextracker NX Horizon, NX Horizon-XTR and NX Gemini tracker rows: strings and modules per row, string voltage at the cold design temperature, slope, terrain, wind, ground coverage, array height, site temperature and the stated DC capacity. See everything this validator covers

This validator models Nextracker tracker row quotes, not just the scenarios shown below.

  • Row layout — the longest row each tracker supports, the strings allowed per tracker at 1,500 V or 1,000 V, the tracking range, and the partial-length rows that are made to order.
  • Electrical limits — the open-circuit string voltage at the site's cold design temperature against the system voltage, and the lowest site temperature each power supply option can take.
  • Site conditions — north-south and east-west slope, undulating terrain (which needs NX Horizon-XTR), design wind, ground coverage ratio and array height, with a review for steep slopes, high wind and plants above 300 MW DC.
  • Stated DC capacity — the total DC capacity the quote states against the capacity computed from the modules quoted.

Any Nextracker tracker row quote that touches these rules is in scope — not only the scenarios pictured here. Not covered: prices (the validator produces no price build-up), TrueCapture, NX Navigator, foundations and drive or controller parts. The product names and the NX Horizon limits come from Nextracker's public datasheets; the NX Gemini and NX Horizon-XTR limits, the approval thresholds and the generic module classes are modeled (see the note at the foot of the page).

The AI sales agentBuilds the tracker quote from the conversation and says it is ready.
Predictika validatorChecks every rule at once and returns the verdict, each finding, and the computed figures.

6 scenarios in 3 groups · each group runs from the agent’s first attempt to the outcome · click one to switch

What the agent proposes

The AI sales agent says

Illustrative agent statement. The validator receives the structured request below.

Proposing agent: AI sales agent (scripted)

Before sending, the agent must call Recorded run

Predictika validator


      

        
        
        
      

      
Waiting for the call.

      
    

  

  
  

    
Where rules-based CPQ gets it wrong
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Our assessment of what a typical rules-based CPQ (product rules, price rules and validation rules, as in Salesforce CPQ) does with the same cases. It is a judgment about effort and reliability, not a claim that nothing can be built.

    
What the validator caughtTypical rules-based CPQPredictika
Limits that depend on the tracker modelOnly with care
The row length, the strings per tracker, the slope and the wind limit differ by model, so each needs a rule keyed to the model.		The tracker model and the layout are in one request and checked together on every call.
A string voltage that depends on the site temperatureOnly with care
The open-circuit voltage rises as the site gets colder, so the rule has to scale the module voltage by the design temperature and the string length before it compares it with the system voltage.		The site low, the module and the string length are fields of one request and the cold voltage is computed on every call.
Options that need a different modelOnly with care
Undulating terrain needs NX Horizon-XTR, so a rule has to look at the terrain and the model at once.		The terrain and the model are checked together on every call.
A stated capacity that must match the computed capacityOnly with workarounds
The DC capacity is trackers times strings times modules times watts, so a separate rule is needed to recompute it and compare it with the stated figure.		The stated capacity is a field of the request and is compared with the computed DC capacity on every call.
Every problem returned in one answerOnly with workarounds
Rules tend to fire as the quote is saved or a step is completed, so a rep often fixes one error and meets the next.		All findings come back together, whatever order the choices arrived in.

  

  

    
What this validator catches: findings from its test cases
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Every rule is checked on every call, in any order the choices arrive; one problem never hides another. Blocking findings stop the quote; approval findings need a person to sign off; everything else is computed.

    
1The quoted row has 93 modules, but this tracker supports at most 90 modules per row.
2The quote puts 4 strings on one tracker, but this tracker takes at most 3 strings at the quoted string voltage.
3At the site low of 5 C a string of 20 modules reaches about 1,051 V open-circuit, above the 1,000 V system voltage.
4At the site low of 5 C a string of 29 modules reaches about 1,525 V open-circuit, above the 1,500 V system voltage.
5At the site low of 5 C a string of 27 modules reaches about 1,522 V open-circuit, above the 1,500 V system voltage.
6At the site low of -20 C a string of 28 modules reaches about 1,566 V open-circuit, above the 1,500 V system voltage.
7The site temperature range (-31 C to 40 C) is outside the operating range of this power supply option (-30 C to 55 C).
8A site low of -30 C with self-powered controllers needs a battery and stow check.
9The site temperature range (-41 C to 40 C) is outside the operating range of this power supply option (-40 C to 55 C).
10The site temperature range (5 C to 56 C) is outside the operating range of this power supply option (-30 C to 55 C).
11NX Gemini is quoted with 1,500 V strings only, but the quote uses 1,000 V strings.
12NX Gemini is quoted with a +/-50 degree tracking range only, but the quote asks for +/-60 degrees.
13The quoted row has 124 modules, but this tracker supports at most 120 modules per row.
14The quote puts 5 strings on one tracker, but this tracker takes at most 4 strings at the quoted string voltage.
15The design wind gust is 236 kph, but this tracker is configurable only up to 235 kph.
16A design wind gust of 236 kph needs a project-specific wind and stow review.
17A design wind gust of 235 kph needs a project-specific wind and stow review.
18The ground coverage ratio is 27 percent, outside the 28 to 50 percent range for this tracker.
19A design wind gust of 240 kph needs a project-specific wind and stow review.
20The design wind gust is 241 kph, but this tracker is configurable only up to 240 kph.
21A design wind gust of 241 kph needs a project-specific wind and stow review.
22A north-south slope of 15 percent needs a site engineering review.
23The site north-south slope is 16 percent, but this tracker handles at most 15 percent.
24A north-south slope of 16 percent needs a site engineering review.
25The site has undulating north-south terrain, which needs NX Horizon-XTR (terrain-following), but another tracker is quoted.
26A north-south slope of 25 percent needs a site engineering review.
27The site north-south slope is 26 percent, but this tracker handles at most 25 percent.
28A north-south slope of 26 percent needs a site engineering review.
29The site east-west slope is 16 percent, but this tracker handles at most 15 percent.
30The ground coverage ratio is 24 percent, outside the 25 to 45 percent range for this tracker.
31The rotation axis height is 12 decimeters, outside the 13 to 18 decimeter (1.3 to 1.8 m) range.
32A row of 75 modules is shorter than the typical 78 to 90 module row; partial-length trackers are made to order.
33The quote states 4,600,000 W DC, but the quoted modules add up to 4,620,000 W DC.
34A plant of 300,300,000 W DC is above 300 MW and needs a commercial review.
35The quoted row has 124 modules, but this tracker supports at most 90 modules per row.
36At the site low of 5 C a string of 31 modules reaches about 1,630 V open-circuit, above the 1,500 V system voltage.
37The site north-south slope is 18 percent, but this tracker handles at most 15 percent.
38The design wind gust is 250 kph, but this tracker is configurable only up to 240 kph.
39The ground coverage ratio is 50 percent, outside the 25 to 45 percent range for this tracker.
40The quote states 1,000 W DC, but the quoted modules add up to 6,820,000 W DC.
41A design wind gust of 250 kph needs a project-specific wind and stow review.
42A north-south slope of 18 percent needs a site engineering review.

  

  

    
Scenarios and results
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The recorded result of the validator for each scenario on this page: the request the AI agent sent, the verdict, and every finding, in the order they appear above.

    
1. Layout, slope and wind: A 100-tracker NX Horizon quote with four strings of 22 modules, a steep slope, high wind and a dense layout

    
The agent's request. Please quote 100 NX Horizon trackers with 4 strings of 22 450 W modules on each, at 1,500 V, with a +/-60 degree tracking range, self-powered controllers, for a planar site with a north-south slope of 16 percent and an east-west slope of 4 percent, a design wind of 250 kph, ground coverage of 50 percent, an axis height of 1.5 m and site temperatures from 5 C to 40 C, for a total of 3,960,000 W DC. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Too many strings per tracker. The quote puts 4 strings on one tracker, but this tracker takes at most 3 strings at the quoted string voltage.
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  • North-south slope too steep. The site north-south slope is 16 percent, but this tracker handles at most 15 percent.
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  • Design wind above the tracker limit. The design wind gust is 250 kph, but this tracker is configurable only up to 240 kph.
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  • Ground coverage ratio outside the range. The ground coverage ratio is 50 percent, outside the 25 to 45 percent range for this tracker.
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  • Design wind above 200 kph. A design wind gust of 250 kph needs a project-specific wind and stow review.
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  • Steep north-south slope. A north-south slope of 16 percent needs a site engineering review.
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2. Layout, slope and wind: The agent resubmits after fixing the errors

    
The agent's request. Please quote 100 NX Horizon trackers with 3 strings of 28 450 W modules on each, at 1,500 V, with a +/-60 degree tracking range, self-powered controllers, for a planar site with a north-south slope of 8 percent and an east-west slope of 4 percent, a design wind of 190 kph, ground coverage of 40 percent, an axis height of 1.5 m and site temperatures from 5 C to 40 C, for a total of 3,780,000 W DC. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Row summary. 100 trackers of 84 modules each (3 strings of 28), 8,400 modules and 3,780,000 W DC in total.
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3. Cold site and NX Gemini: A 50-tracker NX Gemini quote at a cold site on 1,000 V strings with a +/-60 degree range and long Q CELLS strings

    
The agent's request. Please quote 50 NX Gemini trackers with 4 strings of 28 570 W bifacial Q CELLS modules on each, at 1,000 V, with a +/-60 degree tracking range, self-powered controllers, for a planar site with a north-south slope of 6 percent and an east-west slope of 4 percent, a design wind of 160 kph, ground coverage of 27 percent, an axis height of 1.5 m and site temperatures from -25 C to 40 C, for a total of 3,192,000 W DC. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Gemini needs 1,500 V strings. NX Gemini is quoted with 1,500 V strings only, but the quote uses 1,000 V strings.
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  • Gemini tracking range. NX Gemini is quoted with a +/-50 degree tracking range only, but the quote asks for +/-60 degrees.
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  • String voltage at the cold design temperature. At the site low of -25 C a string of 28 modules reaches about 1,700 V open-circuit, above the 1,000 V system voltage.
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  • Ground coverage ratio outside the range. The ground coverage ratio is 27 percent, outside the 28 to 50 percent range for this tracker.
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  • Self-powered controller in deep cold. A site low of -25 C with self-powered controllers needs a battery and stow check.
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4. Cold site and NX Gemini: The agent resubmits after fixing the errors

    
The agent's request. Please quote 50 NX Gemini trackers with 4 strings of 22 570 W bifacial Q CELLS modules on each, at 1,500 V, with a +/-50 degree tracking range, AC powered controllers, for a planar site with a north-south slope of 6 percent and an east-west slope of 4 percent, a design wind of 160 kph, ground coverage of 40 percent, an axis height of 1.5 m and site temperatures from -25 C to 40 C, for a total of 2,508,000 W DC. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Row summary. 50 trackers of 88 modules each (4 strings of 22), 4,400 modules and 2,508,000 W DC in total.
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5. Terrain and stated capacity: A 100-tracker NX Horizon quote for an undulating site, with a low array height and a DC capacity for the plant

    
The agent's request. Please quote 100 NX Horizon trackers with 3 strings of 28 550 W modules on each, at 1,500 V, with a +/-60 degree tracking range, self-powered controllers, for an undulating site with a north-south slope of 18 percent and an east-west slope of 4 percent, a design wind of 160 kph, ground coverage of 35 percent, an axis height of 1.2 m and site temperatures from 5 C to 40 C, for a total of 4,600,000 W DC. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • North-south slope too steep. The site north-south slope is 18 percent, but this tracker handles at most 15 percent.
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  • Undulating terrain needs the terrain-following tracker. The site has undulating north-south terrain, which needs NX Horizon-XTR (terrain-following), but another tracker is quoted.
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  • Array height outside the range. The rotation axis height is 12 decimeters, outside the 13 to 18 decimeter (1.3 to 1.8 m) range.
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  • Stated DC capacity does not match. The quote states 4,600,000 W DC, but the quoted modules add up to 4,620,000 W DC.
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  • Steep north-south slope. A north-south slope of 18 percent needs a site engineering review.
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6. Terrain and stated capacity: The agent resubmits after fixing the errors

    
The agent's request. Please quote 100 NX Horizon-XTR trackers with 3 strings of 28 550 W modules on each, at 1,500 V, with a +/-60 degree tracking range, self-powered controllers, for an undulating site with a north-south slope of 8 percent and an east-west slope of 4 percent, a design wind of 160 kph, ground coverage of 35 percent, an axis height of 1.5 m and site temperatures from 5 C to 40 C, for a total of 4,620,000 W DC. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Row summary. 100 trackers of 84 modules each (3 strings of 28), 8,400 modules and 4,620,000 W DC in total.
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Narration transcript
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The text of the narrated walkthrough, step by step.

    
    
      
  1. Welcome to a demo of Predictika's Validator. An AI sales agent prepares a quote for a block of solar tracker rows: a tracker model, the modules and strings on each row, the string voltage, and more. Before it goes out, the agent sends it to Predictika, which checks it against a declarative model of the NX Horizon, NX Horizon-XTR and NX Gemini trackers and returns a verdict, every reason and the DC capacity it computed.
    2. 
      
  2. I will start with the first request by the agent.
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  3. The agent says. Please quote 100 NX Horizon trackers with 4 strings of 22 450 W modules on each, at 1,500 V, with a +/-60 degree tracking range. It is ready to send. The rest of the request is on screen.
    4. 
      
  4. Before it goes out, the agent calls the validator.
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  5. Blocked, with four findings and two approvals, all in one answer. The quote puts 4 strings on one tracker, but this tracker takes at most 3 strings at the quoted string voltage. The site north-south slope is 16 percent, but this tracker handles at most 15 percent. The design wind gust is 250 kph, but this tracker is configurable only up to 240 kph. The other one is on screen.
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  6. The validator returned four blocking findings and two approvals in one answer. A check that reads one field at a time would pass most of this; it shows only when the choices in the quote are checked against each other.
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  7. What this shows: for limits that depend on the tracker model, a rules-based CPQ is error-prone for this.
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  8. Now the agent resubmits.
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  9. The corrected request. It changes the strings per tracker to 3, the modules per string to 28, the north-south slope to 8 percent, the design wind to 190 kph, the ground coverage to 40 percent and the DC capacity stated on the quote to 3,780,000 W.
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  10. It calls the validator again.
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  11. This time the validator clears it.
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  12. All six earlier findings are cleared.
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  13. Six problems caught in one call, fixed in one pass, and a clean quote. That is the value of Predictika's validator: catching mistakes before they reach the customer. Now you can try the other scenarios yourself.
    14.