Ampworth calculators

{
  "mcpServers": {
    "com.ampworth/calculators": {
      "url": "https://ampworth.com/mcp/calculators"
    }
  }
}

Indexed tools

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• Network connection route

  connection_route

  Work out which ENA connection procedure a domestic installation of solar panels, batteries or both falls under: connect first and notify the distribution network operator within 28 days, or apply and wait for approval before anything is connected. The rules are the ENA's engineering recommendations, not MCS documents: EREC G98 for small installations, EREC G99 for everything larger, and EREC G100 for export limitation. Every test is in amps per phase at a nominal 230 V, and it applies to the premises as a whole, so list EVERY inverter that can export, existing ones included. A battery counts as generation even if it only ever charges from the panels. The figure that counts is each inverter's registered capacity: its AC rating, or a lower limit the manufacturer has fixed. It is NOT the panels' kWp. A 4.4 kWp array on a 3.68 kW inverter is a 3.68 kW installation. Where an inverter has been capped below its hardware rating, give the hardware rating as 'designCapacityKw', because G99 tests that separately. The routes are: G98 when the total is 16 A per phase or less (3.68 kW single phase, 11.04 kW three phase); G99 SGI-1, also connect and notify, when the total is within 16 A but an inverter built for up to 32 A has been capped; G99 SGI-2 and SGI-3, fast track applications answered within 10 working days, which allow larger totals held back by a type-tested export limiter; and the standard G99 application for anything else. An export limiter NEVER brings an installation under G98. IMPORTANT: this says which procedure applies, not what the operator will decide. Approval depends on the local network, which only the operator can assess. Say so whenever you report a result. Method from EREC G98 / G99. These calculators follow the published MCS methods, for understanding a system and checking a quotation. Anything that gets installed still needs a design and a site survey from a certified installer.

  Schema valid · SHA-256 4629958085aa…

  View input schema

  {
    "type": "object",
    "properties": {
      "phases": {
        "type": "integer",
        "description": "The supply: 1 for single phase, which is almost every British house, or 3 for three phase. Defaults to 1."
      },
      "devices": {
        "type": [
          "null",
          "array"
        ],
        "items": {
          "type": "object",
          "properties": {
            "kind": {
              "type": "string",
              "description": "'solar' for a solar inverter, 'battery' for an AC-coupled battery inverter, 'hybrid' for one inverter serving both panels and battery, or 'other'. Required."
            },
            "registeredCapacityKw": {
              "type": "number",
              "description": "The most the device can export, in kW AC: the inverter's rated output, or a lower limit the manufacturer has fixed so the customer cannot change it. From the datasheet or the ENA type test register. Not the panels' kWp. Required."
            },
            "designCapacityKw": {
              "type": "number",
              "description": "What the inverter was built to deliver before any fixed limit, in kW AC: G99 calls this the intrinsic design capacity. Only differs from 'registeredCapacityKw' for an inverter capped below its hardware rating. Defaults to the registered capacity."
            },
            "phase": {
              "type": "string",
              "description": "On a three phase supply, which phase the device is connected to: 'L1', 'L2', 'L3', or 'all' for a three phase inverter, which is split evenly. Ignored on a single phase supply. Defaults to 'L1'."
            },
            "existing": {
              "type": "boolean",
              "description": "True for a device that is already installed. It still counts toward the total. Defaults to false."
            },
            "label": {
              "type": "string",
              "description": "A name for this device, for the breakdown."
            }
          },
          "required": [
            "kind",
            "registeredCapacityKw"
          ],
          "additionalProperties": false
        },
        "description": "Every inverter at the premises that can export: solar, battery and hybrid, existing ones included. A battery counts even if it only charges from the panels. At least one is required."
      },
      "exportLimitKw": {
        "type": "number",
        "description": "The export limit a fully type-tested G100 scheme would hold the premises to, in kW per phase, where one is proposed. Optional. An export limit never brings an installation under G98, but it decides which G99 route applies."
      },
      "otherInstallationsNearby": {
        "type": "boolean",
        "description": "True when the same installer has fitted, or plans to fit, generation at other premises within 500 metres, or on the same street, within 28 days either side. That turns a G98 notification into an application. Defaults to false."
      }
    },
    "required": [
      "devices"
    ],
    "additionalProperties": false
  }