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Support MeterDiv involvement in Watt calculation.

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This commit is contained in:
Victor Chang
2024-06-13 23:55:03 -07:00
parent 5ac97c9e90
commit b47be0769f
2 changed files with 22 additions and 10 deletions
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18
docs/protocol-meter-reading.md
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@@ -102,7 +102,7 @@ Blank cells have never been seen to be anything other than zero. Some cells have
<tr> <th>12</th> <td colspan=1></td><td colspan=1 align="center">0x01</td><td colspan=2></td></tr>
<tr> <th>16</th> <td colspan=1 align="center">0x25</td><td colspan=3 align="center">ExportWh~</td></tr>
<tr> <th>20</th> <td colspan=1 align="center">~ExportWh</td><td colspan=2></td><td colspan=1 align="center">0x01</td></tr>
<tr> <th>24</th> <td colspan=1 align="center">0x03</td><td colspan=1></td><td colspan=1 align="center">0x22</td><td colspan=1 align="center">0x01</td></tr>
<tr> <th>24</th> <td colspan=1 align="center">0x03</td><td colspan=1></td><td colspan=1 align="center">0x22</td><td colspan=1 align="center">MeterDiv</td></tr>
<tr> <th>28</th> <td colspan=2></td><td colspan=1 align="center">0x02</td><td colspan=1 align="center">0x03</td></tr>
<tr> <th>32</th> <td colspan=1></td><td colspan=1 align="center">0x22</td><td colspan=2 align="center">EnergyCostUnit</td></tr>
<tr> <th>36</th> <td colspan=1></td><td colspan=1></td><td colspan=1 align="center">0x04</td><td colspan=1></td></tr>
@@ -123,20 +123,26 @@ Bytes 17 to 20, (32 bit int, probably unsigned, LSB)
Cumulative watt-hours sent to the grid. Unknown when the value resets, but probably never resets since ESP32 never sends a clock sync to the MGM111 so it likely just rolls over.
#### PowerVal
#### MeterDiv
Bytes 41 and 43 (24 bit signed int, LSB)
Byte 27
The power being sent or consumed at this moment. This is in watts for me but I know in the V2 payload that there is a `MeterDiv`, which means `PowerVal` might be a multiplication of the real wattage. If V7 also has this behavior then `MeterDiv` must have a value of 1 in my readings. So, `MeterDiv` might be byte 2, 13, 23, or 27.
Used in conjunction with `EnergyCostUnit` and `PowerVal` to calculate the actual wattage.
#### EnergyCostUnit(?)
#### EnergyCostUnit
Bytes 34 and 35 LSB
Usually `0xE803`, which is `0x03E8` = `1000`. Continuing the V2 theorization that this is the number of watt-hour units per "cost unit".
Since people are typically charged per kWh, this value is typically 1000.
This value is not currently used in the code.
#### PowerVal
Bytes 41 and 43 (24 bit signed int, LSB)
The power being sent or consumed at this moment. The actual wattage is calculated with the formula:
`Watts = PowerVal * MeterDiv / (EnergyCostUnit / 1000)`
#### Incrementor

14
esphome/components/emporia_vue_utility/emporia_vue_utility.h
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@@ -82,7 +82,9 @@ class EmporiaVueUtility : public PollingComponent, public uart::UARTDevice {
uint32_t import_wh; // Payload Bytes 7 to 10
byte unknown11[6]; // Payload Bytes 11 to 16
uint32_t export_wh; // Payload Bytes 17 to 20
byte unknown21[13]; // Payload Bytes 21 to 33
byte unknown21[6]; // Payload Bytes 21 to 26
uint8_t meter_div; // Payload Byte 27
byte unknown28[6]; // Payload Bytes 28 to 33
uint16_t cost_unit; // Payload Bytes 34 to 35
byte unknown36[4]; // Payload Bytes 36 to 39
uint32_t watts; // Payload Bytes 40 to 43 : Starts with 0x2A, only use the
@@ -351,13 +353,14 @@ class EmporiaVueUtility : public PollingComponent, public uart::UARTDevice {
}
cost_unit = mr7->cost_unit;
watts = parse_meter_watts_v7(mr7->watts);
watts = parse_meter_watts_v7(mr7);
watt_hours = parse_meter_watt_hours_v7(mr7);
// Extra debugging of non-zero bytes, only on first packet or if
// debug_ is true
if ((debug_) || (last_meter_reading == 0)) {
ESP_LOGD(TAG, "Meter Cost Unit: %d", cost_unit);
ESP_LOGD(TAG, "Meter Divisor: %d", mr7->meter_div);
ESP_LOGD(TAG, "Meter Energy Import Flags: %08x", mr7->import_wh);
ESP_LOGD(TAG, "Meter Energy Export Flags: %08x", mr7->export_wh);
ESP_LOGD(TAG, "Meter Power Flags: %08x", mr7->watts);
@@ -620,10 +623,13 @@ class EmporiaVueUtility : public PollingComponent, public uart::UARTDevice {
*
* For MGM version 7 and 8
*/
float parse_meter_watts_v7(int32_t watts) {
float parse_meter_watts_v7(struct MeterReadingV7 *mr) {
// Read the instant watts value
// (it's actually a 24-bit int)
watts >>= 8;
int32_t watts_raw = mr->watts;
watts_raw >>= 8;
float watts = ((float)watts_raw * (float)mr->meter_div) /
((float)mr->cost_unit / 1000.0);
if ((watts >= WATTS_MAX) || (watts < WATTS_MIN)) {
ESP_LOGE(TAG, "Unreasonable watts value %d", watts);