Projected Payback
4.0 years
From the current ROI section
Executive Summary
The system is already strong. The main win is charging the EV earlier.
Your 6.5 kWp system is performing well and the main story is seasonal improvement: self-sufficiency rose from 54.3% in December 2025 to 76.5% in March 2026 as solar production climbed from ~16.5 to ~27.2 kWh/day. Across the four months, the system cut estimated grid spend by about 69% and is tracking toward a simple payback of ~4.0 years on a reported PHP 400,000 investment.
Annual Bill Reduction
69%
PHP 100,150
Projected Annual Generation
~7242 kWh in year 1, ~6888 kWh in year 10, ~6389 kWh in year 25
Year 1 estimate from the annual projection
Carbon Avoided
~4.4 tonnes CO2 avoided annually at 0.68 kg CO2/kWh
From the annual projection section
System Profile
Configuration
- PV Array
- 6.5 kWp
- Battery
- 14.3 kWh nominal, ~14.4 kWh estimated usable in the data; treat that as effectively full nominal capacity rather than true >100% usable because the estimate is sensitive to SOC reporting
- Inverter
- 8.0 kW AC (DC/AC ratio: 0.81)
- EV Usage
- PHEV present; 30 EV-like charging days detected in 120 full days
- Tariff
- Flat rate at PHP 14/kWh
- Location
- Cavite, Philippines
Top Recommendation
1. Shift PHEV charging into the late-morning solar window
What is happening now: your solar output is strongest from 09:00 to 14:00, with the average peak around 12:00. On EV/PHEV days, the charging signature extends from 09:00 through 20:00, and the heaviest average EV-day load appears at 15:00 when household demand reaches ~4.3 kW. That timing forces the battery to discharge hard and still leaves the grid supplying about 0.8 kWh in that hour on average. The single highest grid-draw hour in the whole dataset was 8.7 kW on 2025-12-02 at 16:00, and it was an EV day.
Monthly Snapshot
Financial impact from the current report
| Month | Without Solar | With Solar | Feed-in Credit | Net Savings |
|---|---|---|---|---|
| 2025-12 | PHP 13,042 | PHP 5,959 | PHP 0 | PHP 7,084 |
| 2026-01 | PHP 11,628 | PHP 4,654 | PHP 76 | PHP 7,051 |
| 2026-02 | PHP 10,763 | PHP 2,912 | PHP 624 | PHP 8,474 |
| 2026-03 | PHP 12,341 | PHP 2,899 | PHP 874 | PHP 10,317 |
Battery Health
Current battery indicators
- Nominal capacity: 14.3 kWh
- Estimated usable capacity from the data: ~14.4 kWh (101% of nominal)
- Round-trip efficiency: 94.5% to 98.3% across the four months
- Daily equivalent full cycles: ~0.61
Alerts
Anomalies called out by the report
| Type | Date | Observation | Likely Cause |
|---|---|---|---|
| PV Generation Alerts | 2025-12-07 | Daily PV 9.9 with deviation -43% | Likely heavy cloud cover |
| PV Generation Alerts | 2025-12-08 | Daily PV 9.6 with deviation -41% | Likely heavy cloud cover |
| PV Generation Alerts | 2025-12-09 | Daily PV 8.6 with deviation -45% | Likely heavy cloud cover |
| PV Generation Alerts | 2026-02-08 | Daily PV 10.9 with deviation -44% | Likely heavy cloud cover |
| PV Generation Alerts | 2026-03-17 | Daily PV 15.8 with deviation -44% | Likely heavy cloud cover |