Predictika · Sunny Tripower CORE2 string design

An AI sales agent's commercial PV inverter design, checked before it goes out

An AI sales agent prepares an order for the Sunny Tripower CORE2 STP 110-60 together with the string design behind it: modules per string, strings and MPP trackers, site temperatures and grid. Before it goes out, the agent sends it to Predictika, which checks it against a declarative model of the inverter limits and returns a verdict, every reason and the figures it computed.

Scope: SMA Sunny Tripower CORE2 STP 110-60 (110 kW, 12 MPP trackers): string design, array size, site conditions, grid and warranty. See everything this validator covers

This validator models orders for the SMA Sunny Tripower CORE2 STP 110-60 and the string design that goes with it, not just the scenarios shown below.

  • DC side — 12 independent MPP trackers with 1 or 2 strings each (24 strings), maximum input voltage 1100 V (checked at the coldest site temperature), MPP range 500 V to 800 V, start voltage 250 V, 26 A input current and 40 A short-circuit current per tracker, and a PV array of at most 165,000 Wp.
  • Site and grid — operating temperature range -30 to +60 degrees C, AC voltage range 320 V to 460 V (400 V nominal), 50 or 60 Hz, and a warranty of 5 years (standard) or 10, 15 or 20 years (optional).
  • Computed and compared — array power and short-circuit current per tracker are computed from the design and compared with the figures the agent states; project orders of 10 or more inverters need approval.

Any STP 110-60 design that touches these rules is in scope — not only the scenarios pictured here. Not covered: prices (this validator produces no price build-up or line-item quote), other SMA inverters such as the Sunny Boy, Sunny Tripower X or Smart Energy models, storage and the Sunny Home Manager, and module-level or wiring details. The cold-temperature voltage check and the approval rules are modeled from standard PV practice rather than taken from SMA documents (see the footnote).

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

7 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
A string voltage that depends on the coldest site dayOnly with workarounds
The open-circuit voltage rises as it gets colder, by the module temperature coefficient. That needs a calculation from several fields and a comparison with 1100 V, which rule screens handle poorly.		The module voltage, temperature coefficient, modules per string and coldest temperature are combined on every call and compared with 1100 V.
Tracker current that depends on how strings are spreadOnly with workarounds
Whether a tracker carries one string or two depends on the string and tracker counts; the current limits must then be checked against that worst case.		The worst-case strings per tracker is computed and both current limits are checked against it.
Array power that must match the stated figureOnly with care
A stated figure is a free-entry field; a rule can compare it with a computed total, but someone has to write and maintain that comparison.		The stated figure travels with the design and is compared with the computed figure on every call.
A working voltage window with a start voltage and an MPP rangeOnly with care
Three different voltage limits apply to the same value, some blocking and some only worth a look. They can be written, but each needs its own rule and message.		Each limit is its own finding, with blocks and approvals reported together.
Every problem returned in one answerOnly with workarounds
Rules tend to fire as the order 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 order; approval findings need a person to sign off; everything else is computed.

    
1The STP 110-60 has 12 independent MPP trackers; the design uses 13.
2The STP 110-60 has 12 independent MPP trackers; the design uses 0.
3Each MPP tracker takes 1 or 2 strings; 16 strings cannot be connected to 0 tracker(s).
4Each MPP tracker takes 1 or 2 strings; 25 strings cannot be connected to 12 tracker(s).
5The PV array per inverter is 247,500 Wp; the maximum is 165,000 Wp STC.
6The PV array per inverter is 237,600 Wp; the maximum is 165,000 Wp STC.
7The design counts 12 trackers in use but has only 10 strings, so a tracker would have no string.
821 modules in series reach more than the 1,100 V maximum input voltage on a cold day (module open-circuit voltage 50 V, coldest day -10 degrees C).
9A string working at 882 V is outside the 500 V to 800 V MPP voltage range, so a person should confirm the expected yield.
10A string working at 840 V is outside the 500 V to 800 V MPP voltage range, so a person should confirm the expected yield.
1120 modules in series reach more than the 1,100 V maximum input voltage on a cold day (module open-circuit voltage 50 V, coldest day -20 degrees C).
12A string of 5 modules works at 210 V, below the 250 V start input voltage.
13A string working at 210 V is outside the 500 V to 800 V MPP voltage range, so a person should confirm the expected yield.
14The strings on one tracker carry 28 A of working current; the maximum input current per MPP tracker is 26 A.
15The strings on one tracker reach 42 A of short-circuit current; the maximum per MPP tracker is 40 A.
16The operating temperature range is -30 to +60 degrees C; the site runs from -35 to 40 degrees C.
17The operating temperature range is -30 to +60 degrees C; the site runs from -10 to 65 degrees C.
18The AC voltage range is 320 V to 460 V (400 V nominal); the site grid is 300 V.
19The AC voltage range is 320 V to 460 V (400 V nominal); the site grid is 480 V.
20The inverter supports 50 Hz and 60 Hz grids; the site grid is 55 Hz.
21The warranty is 5 years as standard, or 10, 15 or 20 years optional; the order has 7 years.
22The order must include at least one inverter; it has 0.
23A string working at 462 V is outside the 500 V to 800 V MPP voltage range, so a person should confirm the expected yield.
2410 inverters is a project order; a person should confirm project terms and delivery.
25The order states a PV array of 165,000 Wp per inverter, but the strings and modules add up to 158,400 Wp.
26The order states 14 A of short-circuit current per tracker, but the design gives 28 A.
27The STP 110-60 has 12 independent MPP trackers; the design uses 14.
28Each MPP tracker takes 1 or 2 strings; 30 strings cannot be connected to 14 tracker(s).
2922 modules in series reach more than the 1,100 V maximum input voltage on a cold day (module open-circuit voltage 50 V, coldest day -10 degrees C).
30The strings on one tracker carry 30 A of working current; the maximum input current per MPP tracker is 26 A.
31The PV array per inverter is 363,000 Wp; the maximum is 165,000 Wp STC.
32The warranty is 5 years as standard, or 10, 15 or 20 years optional; the order has 8 years.
33The order states a PV array of 100 Wp per inverter, but the strings and modules add up to 363,000 Wp.
34A string working at 924 V is outside the 500 V to 800 V MPP voltage range, so a person should confirm the expected yield.

  

  

    
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. Ground mount: A ground-mount array of 24 strings of high-current modules

    
The agent's request. Please order 1 Sunny Tripower CORE2 STP 110-60 inverter for 24 strings of 18 modules over 12 MPP trackers. The modules are 550 Wp with 50 V open-circuit voltage (temperature coefficient -0.26% per kelvin), 42 V working voltage, 21 A short-circuit current and 15 A working current. The site runs from -10 to 40 degrees C on a 400 V, 50 Hz grid, with a 5-year warranty. The order states a PV array of 237,600 Wp per inverter and 42 A of short-circuit current per tracker. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Tracker input current above 26 A. The strings on one tracker carry 30 A of working current; the maximum input current per MPP tracker is 26 A.
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  • Tracker short-circuit current above 40 A. The strings on one tracker reach 42 A of short-circuit current; the maximum per MPP tracker is 40 A.
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  • PV array larger than 165,000 Wp. The PV array per inverter is 237,600 Wp; the maximum is 165,000 Wp STC.
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2. Ground mount: The agent resubmits after fixing the errors

    
The agent's request. Please order 1 Sunny Tripower CORE2 STP 110-60 inverter for 24 strings of 18 modules over 12 MPP trackers. The modules are 550 Wp with 50 V open-circuit voltage (temperature coefficient -0.26% per kelvin), 42 V working voltage, 15 A short-circuit current and 13 A working current. The site runs from -10 to 40 degrees C on a 400 V, 50 Hz grid, with a 5-year warranty. The order states a PV array of 237,600 Wp per inverter and 30 A of short-circuit current per tracker. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • PV array larger than 165,000 Wp. The PV array per inverter is 237,600 Wp; the maximum is 165,000 Wp STC.
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3. Ground mount: The agent resubmits after fixing the errors

    
The agent's request. Please order 1 Sunny Tripower CORE2 STP 110-60 inverter for 16 strings of 18 modules over 12 MPP trackers. The modules are 550 Wp with 50 V open-circuit voltage (temperature coefficient -0.26% per kelvin), 42 V working voltage, 14 A short-circuit current and 13 A working current. The site runs from -10 to 40 degrees C on a 400 V, 50 Hz grid, with a 5-year warranty. The order states a PV array of 158,400 Wp per inverter and 28 A of short-circuit current per tracker. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Design summary. 158,400 Wp on 16 strings of 18 modules over 12 MPP trackers, working voltage 756 V per string, up to 28 A short-circuit current per tracker.
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4. Cold-climate rooftop: A rooftop array with 22 modules per string at a site that falls to -20 degrees C

    
The agent's request. Please order 1 Sunny Tripower CORE2 STP 110-60 inverter for 14 strings of 22 modules over 12 MPP trackers. The modules are 550 Wp with 50 V open-circuit voltage (temperature coefficient -0.26% per kelvin), 42 V working voltage, 14 A short-circuit current and 13 A working current. The site runs from -20 to 40 degrees C on a 400 V, 50 Hz grid, with a 5-year warranty. The order states a PV array of 169,400 Wp per inverter and 28 A of short-circuit current per tracker. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • String voltage above 1100 V when cold. 22 modules in series reach more than the 1,100 V maximum input voltage on a cold day (module open-circuit voltage 50 V, coldest day -20 degrees C).
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  • PV array larger than 165,000 Wp. The PV array per inverter is 169,400 Wp; the maximum is 165,000 Wp STC.
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  • String voltage outside the MPP range. A string working at 924 V is outside the 500 V to 800 V MPP voltage range, so a person should confirm the expected yield.
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5. Cold-climate rooftop: The agent resubmits after fixing the errors

    
The agent's request. Please order 1 Sunny Tripower CORE2 STP 110-60 inverter for 14 strings of 18 modules over 12 MPP trackers. The modules are 550 Wp with 50 V open-circuit voltage (temperature coefficient -0.26% per kelvin), 42 V working voltage, 14 A short-circuit current and 13 A working current. The site runs from -20 to 40 degrees C on a 400 V, 50 Hz grid, with a 5-year warranty. The order states a PV array of 138,600 Wp per inverter and 28 A of short-circuit current per tracker. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Design summary. 138,600 Wp on 14 strings of 18 modules over 12 MPP trackers, working voltage 756 V per string, up to 28 A short-circuit current per tracker.
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6. Ten-inverter project: A ten-inverter project with an 8-year warranty

    
The agent's request. Please order 10 Sunny Tripower CORE2 STP 110-60 inverters for 16 strings of 18 modules over 12 MPP trackers. The modules are 550 Wp with 50 V open-circuit voltage (temperature coefficient -0.26% per kelvin), 42 V working voltage, 14 A short-circuit current and 13 A working current. The site runs from -10 to 40 degrees C on a 400 V, 50 Hz grid, with a 8-year warranty. The order states a PV array of 158,400 Wp per inverter and 28 A of short-circuit current per tracker. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Warranty term not offered. The warranty is 5 years as standard, or 10, 15 or 20 years optional; the order has 8 years.
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  • Project order to confirm. 10 inverters is a project order; a person should confirm project terms and delivery.
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7. Ten-inverter project: The agent resubmits after fixing the errors

    
The agent's request. Please order 10 Sunny Tripower CORE2 STP 110-60 inverters for 16 strings of 18 modules over 12 MPP trackers. The modules are 550 Wp with 50 V open-circuit voltage (temperature coefficient -0.26% per kelvin), 42 V working voltage, 14 A short-circuit current and 13 A working current. The site runs from -10 to 40 degrees C on a 400 V, 50 Hz grid, with a 10-year warranty. The order states a PV array of 158,400 Wp per inverter and 28 A of short-circuit current per tracker. It is ready to send.

    
Verdict: Needs approval.

    
    
      
  • Project order to confirm. 10 inverters is a project order; a person should confirm project terms and delivery.
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  • Design summary. 158,400 Wp on 16 strings of 18 modules over 12 MPP trackers, working voltage 756 V per string, up to 28 A short-circuit current per tracker.
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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 an order for the Sunny Tripower CORE2 STP 110-60 together with the string design behind it: modules per string, strings and MPP trackers, site temperatures and grid. Before it goes out, the agent sends it to Predictika, which checks it against a declarative model of the inverter limits and returns a verdict, every reason and the figures it computed.
    2. 
      
  2. I will start with the first request by the agent.
    3. 
      
  3. The agent says. Please order 1 Sunny Tripower CORE2 STP 110-60 inverter for 24 strings of 18 modules over 12 MPP trackers. The modules are 550 Wp with 50 V open-circuit voltage (temperature coefficient -0.26% per kelvin), 42 V working voltage, 21 A short-circuit current and 15 A working current. The rest of the request is on screen. The order states a PV array of 237,600 Wp per inverter and 42 A of short-circuit current per tracker.
    4. 
      
  4. Before it goes out, the agent calls the validator.
    5. 
      
  5. Blocked, with three findings, all in one answer. The strings on one tracker carry 30 A of working current; the maximum input current per MPP tracker is 26 A. The strings on one tracker reach 42 A of short-circuit current; the maximum per MPP tracker is 40 A. The PV array per inverter is 237,600 Wp; the maximum is 165,000 Wp STC.
    6. 
      
  6. The validator returned three blocking findings 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 order are checked against each other.
    7. 
      
  7. What this shows: for tracker current that depends on how strings are spread, a rules-based CPQ can do this only with workarounds.
    8. 
      
  8. Now the agent resubmits.
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  9. The corrected request. It changes the module short-circuit current to 15 A, the module working current to 13 A and the stated short-circuit current per tracker to 30 A.
    10. 
      
  10. It calls the validator again.
    11. 
      
  11. Still blocked, with one finding, all in one answer. The PV array per inverter is 237,600 Wp; the maximum is 165,000 Wp STC.
    12. 
      
  12. Two findings cleared. Still blocking: PV array larger than 165,000 Wp.
    13. 
      
  13. The agent resubmits once more.
    14. 
      
  14. The revised request. It changes the strings to 16, the module short-circuit current to 14 A, the Stated PV array per inverter to 158,400 Wp and the stated short-circuit current per tracker to 28 A.
    15. 
      
  15. It calls the validator once more.
    16. 
      
  16. This time the validator clears it.
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  17. The earlier finding is cleared, and the validator's figure matches the order.
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  18. Three problems caught in one call, fixed in two passes, and a clean order. That is the value of Predictika's validator: catching mistakes before they reach the customer. Now you can try the other scenarios yourself.
    19.