Solar Panel Calculator for Maryland (MD)

Q: How many solar panels do I need in Maryland?

With 4.2 peak sun hours per day and 400W panels, a typical Maryland home using 7419 kWh/month needs approximately 185 panels (74.00 kW system). This accounts for an 80% system efficiency derate factor per industry standards.

Q: How much does solar cost in Maryland?

The average solar installation cost in Maryland is approximately $2.90 per watt before incentives. A 74.00 kW system costs about $214,600 before the 30% federal ITC, bringing the net cost to approximately $150,220.

Q: What is the solar payback period in Maryland?

Based on electricity rates of $0.155/kWh and 4.2 peak sun hours, a typical solar system in Maryland pays for itself in approximately 7.9 years. Over 25 years, estimated net savings is $326,236.

Q: Does Maryland have net metering?

Maryland net metering status: Yes. Contact your local utility for the most current export rates and program details.

Q: What solar incentives are available in Maryland?

Solar incentives in Maryland include: Federal ITC (30%), MD SREC program, property tax exemption. Always verify current incentive availability with your installer and the DSIRE database.

Q: What wire size do I need for solar panels in Maryland?

Solar panel wiring must comply with NEC Article 690. Common sizes include 10 AWG for panel-to-combiner runs (up to 30A), 6 AWG for main DC runs, and appropriately sized AC wiring from inverter to panel. Use our Wire Size Calculator for exact sizing.

Calculate how many solar panels you need in Maryland, estimated costs after the 30% federal tax credit, payback period, and 25-year savings. Based on 4.2 peak sun hours/day and $0.155/kWh average electricity rate.

Peak Sun Hours

4.2 hrs/day

Avg Rate

$0.155/kWh

Net Metering

Yes

Solar Rank

#10/51

☀️ Maryland Solar Panel Calculator

Monthly Electricity Usage7,419 kWh

Panel Wattage400W

Desired Offset100%

Your Maryland Solar System

Panels Needed

185

System Size

74.00 kW

Annual Production

90,754 kWh

Gross Cost

$214,600

Federal ITC (30%)

-$64,380

Net Cost

$150,220

Annual Savings

$19,058/yr

Payback Period

7.9 years

25-Year Savings

$326,236

CO₂ Offset

70.8 tons/yr

Trees Equivalent

1,180/yr

💰 SREC Income: ~$4,991/year from Maryland's SREC program at $55/MWh

⚠️ Estimates only. Actual costs and production vary. Consult a licensed solar installer. NEC Article 690 compliance required.

Solar System Sizes by Usage in Maryland

Monthly kWh	Panels	System kW	Net Cost	Savings/yr	Payback
500 kWh	13	5.2	$10,556	$988	10.7 yrs
750 kWh	19	7.6	$15,428	$1,445	10.7 yrs
1,000 kWh	25	10.0	$20,300	$1,901	10.7 yrs
1,250 kWh	32	12.8	$25,984	$2,433	10.7 yrs
1,500 kWh	38	15.2	$30,856	$2,889	10.7 yrs
2,000 kWh	50	20.0	$40,600	$3,802	10.7 yrs
2,500 kWh	63	25.2	$51,156	$4,790	10.7 yrs

Based on 4.2 peak sun hours/day, $0.155/kWh, $2.9/W install cost, 80% derate. 30% federal ITC applied.

Complete Guide to Solar Panels in Maryland (2026)

Maryland receives an average of 4.2 peak sun hours per day, where high electricity rates can offset moderate sun hours. With average residential electricity rates of $0.155/kWh, solar offers meaningful savings potential.

Solar Installation Costs in Maryland

The average cost to install solar panels in Maryland is $2.90 per watt before incentives. For a typical 8 kW system, that translates to approximately $23,200 gross, or $16,240 after the 30% federal ITC. Available incentives: Federal ITC (30%), MD SREC program, property tax exemption.

Net Metering in Maryland

Maryland net metering status: Yes. Maryland offers strong SREC values and a property tax exemption for solar systems.

NEC Requirements for Solar in Maryland

All solar installations must comply with NEC Article 690 — Solar PV Systems. Key requirements:

NEC 690.8 — Circuit Sizing: PV conductors must carry at least 125% of maximum circuit current. For a 10A string, conductors must be rated for 12.5A minimum.

NEC 690.12 — Rapid Shutdown: Module-level shutdown must reduce voltage to 80V or less within 30 seconds. Critical for firefighter safety.

NEC 690.31 — Wiring Methods: USE-2 or PV Wire within the array; approved wiring methods (EMT, rigid conduit, MC cable) for building penetrations.

NEC 310.15 — Ampacity Derating: Conductors in conduit must be derated per Table 310.15(B)(3)(a). Account for seasonal temperature variations when sizing conductors. Use our Wire Size Calculator and Derating Calculator for proper sizing.

Solar Wire Sizing for Maryland

Panel strings to combiner box: Typically 10 AWG USE-2 or PV Wire for runs up to 100 feet. Use our Solar Wire Size Calculator to verify.

DC main run to inverter: Usually 6 AWG or 4 AWG THWN-2 in conduit. Keep DC voltage drop under 1.5% with our Voltage Drop Calculator.

AC from inverter to panel: A 7.6kW inverter on 240V draws ~32A, requiring a 40A breaker and 8 AWG copper minimum. Verify with our Breaker Size Calculator.

Environmental Impact

A 74.00 kW system in Maryland offsets approximately 70.8 metric tons of CO₂ per year, equivalent to planting 1,180 trees annually. Maryland grid carbon intensity: 0.78 lbs CO₂/kWh.

Disclaimer: Estimates only. Actual costs and production vary by roof orientation, shading, installer, and equipment. Consult a licensed solar installer in Maryland. NEC Article 690 compliance required for all installations.

Frequently Asked Questions

How many solar panels do I need in Maryland?

How much does solar cost in Maryland?

What is the solar payback period in Maryland?

Does Maryland have net metering?

What solar incentives are available in Maryland?

What wire size do I need for solar panels in Maryland?

Top 10 Solar States Comparison

Rank	State	Sun Hours	Rate	Cost/Watt
#1	California	5.8	$0.267	$2.82
#2	Hawaii	5.2	$0.387	$3.35
#2	Texas	5.3	$0.134	$2.6
#3	Arizona	6.5	$0.134	$2.55
#4	Florida	5.5	$0.145	$2.6
#5	Nevada	6.2	$0.127	$2.55
#6	Massachusetts	3.8	$0.268	$3.2
#7	New Jersey	4.2	$0.175	$2.9
#8	New Mexico	6.2	$0.137	$2.75
#9	Colorado	5.5	$0.148	$2.9