Solar ROI & Load Profile Calculator

System Inputs

7-Day Schedule Matrix

Active Days

Start Time00:00
End Time24:00

Active Days

Start Time05:00
End Time14:00

Active Days

Start Time05:00
End Time14:00

Weekly Totals (7-day sum)

Solar

434.9 kWh

Load

699.0 kWh

Self-Used

321.6 kWh

Grid

377.4 kWh

Excess

113.3 kWh

Per-Day Breakdown

Mon

Load
115.8
Self-Used
53.9
Grid
61.9
Excess
8.2

Tue

Load
115.8
Self-Used
53.9
Grid
61.9
Excess
8.2

Wed

Load
115.8
Self-Used
53.9
Grid
61.9
Excess
8.2

Thu

Load
115.8
Self-Used
53.9
Grid
61.9
Excess
8.2

Fri

Load
115.8
Self-Used
53.9
Grid
61.9
Excess
8.2

Sat

Load
60.0
Self-Used
26.0
Grid
34.0
Excess
36.2

Sun

Load
60.0
Self-Used
26.0
Grid
34.0
Excess
36.2

Load Profile Visualization

Daily Detail

Mondayhourly profile — solar generation, load, and self-consumed / grid / excess breakdown.

2 distinct schedule groups — all will appear in the PDF export.

Weekly Overview

Total Load, Solar Used, and Wasted Solar per day (Mon–Sun).

Tariff & Savings Comparison (weekly totals × 4.28)

Case 1: No Solar (Normal Rate)

Grid kWh / mo
2,991.7
Monthly Cost (THB)
13,054.35 THB
Annual Cost (THB)
156,652.23 THB

Case 2: Solar (Normal Rate)

Grid kWh / mo
1,615.3
Monthly Cost (THB)
6,940.76 THB
Annual Cost (THB)
83,289.08 THB

Case 3: Solar (TOU Rate)

Grid kWh / mo
1,615.3
Monthly Cost (THB)
5,360.23 THB
Annual Cost (THB)
64,322.80 THB

Wasted Excess Solar (kWh/mo)

485.1 kWh

Schedule Waste Insight

113.3 kWh/week of solar generation is wasted when machines are off — projected to 485.1 kWh/month at 4.28 weeks.

Monthly Savings (Case 3 vs Case 1)

7,694.12 THB

Annual Savings (Case 3 vs Case 1)

92,329.44 THB

Normal Rate: Tier 1 (0–150 kWh) 3.2484, Tier 2 (151–400) 4.2218, Tier 3 (401+) 4.4417 THB/kWh. TOU: On-peak Mon–Fri 09:00–22:00 at 5.7982 THB; off-peak (Mon–Fri 22:00–09:00 + all Sat–Sun hours) at 2.6369 THB/kWh. Monthly estimates = weekly totals × 4.28.