PC Power Supply Calculator
Calculate recommended PSU wattage for any PC build. Enter CPU, GPU, RAM, and storage to get wattage, efficiency rating, and annual electricity cost. Free, no signup.
PC Power Supply & Solar Calculator
Enter your PC components and daily usage hours. Get total system wattage, daily kWh, recommended PSU size, and the solar panels needed to power your workstation.
| Rating | Efficiency | Wall Draw | Annual kWh | Annual Cost |
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What This Tool Covers
This calculator computes the total power draw of a PC or workstation, then translates that consumption into solar terms - how many panels it takes to offset the electricity cost, how many kWh the system uses annually, and what PSU wattage the build actually needs. It bridges the gap between PC building and solar energy planning for home offices, gaming setups, and creator workstations.
PC Component Inputs
Configure every component in your build to calculate an accurate system power draw.
- CPU TDP (5–500W) with overclock toggle (+25%)
- GPU TGP (0–700W), number of GPUs (1–4)
- RAM type (DDR4/DDR5), number of sticks; NVMe, SATA, HDD counts
- CPU cooler type, case fans, sound card, network card, capture card
- Daily usage hours, PSU efficiency rating, electricity rate ($/kWh)
Power and Solar Outputs
Wattage recommendation, annual energy cost, and solar panel count needed to offset the workstation's consumption.
- Recommended PSU wattage with headroom (min / recommended / future-proof)
- Peak wall draw (W), idle wall draw (W)
- Monthly electricity cost ($) and annual energy (kWh)
- Number of 400W solar panels needed to offset annual consumption
- PSU efficiency comparison table across Bronze through Titanium tiers
Why Solar Professionals Use This Tool
Home office and gaming PC loads are among the highest-consumption devices in a household - often running 8–14 hours daily. Accurately accounting for workstation power draw changes system sizing recommendations and strengthens proposals for tech-heavy households.
Component-Level Breakdown
A stacked bar chart shows the wattage contribution of CPU, GPU, RAM, storage, cooling, motherboard, and peripherals. Customers see exactly which components drive their electricity bill - and the impact of upgrading to a more efficient GPU or adding a second monitor.
Solar Bridge Section
Shows the PC's annual kWh as a percentage of the US average home (10,800 kWh/yr) and calculates how many 400W solar panels fully offset the workstation's consumption - a direct bridge from PC building to solar sizing conversations.
Quick-Load Presets
One-click configurations for Office PC, Mid-Range Gaming, High-End Gaming, and Creator Workstation auto-populate all component fields. Useful for rapid load analysis during a customer site visit without knowing every component spec.
How It Works
The calculator sums component wattages, applies PSU efficiency to get wall draw, then scales by daily usage hours and electricity rate to produce annual energy cost and solar offset metrics.
Select a Preset or Enter Components Manually
Choose a quick-load preset (Office, Gaming, Creator) to auto-fill fields, or configure each component manually. Start with CPU TDP, GPU TGP, and RAM - these three typically account for 80–90% of total system draw.
Add Storage, Cooling, and Peripherals
Use the steppers to count NVMe SSDs, SATA SSDs, and HDDs. Select CPU cooler type and number of case fans. Add any peripherals: sound card, capture card, network card, USB devices. Each component adds its rated wattage to the system total.
Set Usage Hours and PSU Efficiency
Select daily usage hours from presets (Light 2h, Gaming 5h, Work 8h, Heavy 14h, Always On 24h) or enter a custom value. Choose your PSU efficiency tier - higher efficiency ratings (Gold, Platinum, Titanium) reduce wall draw and annual electricity cost.
Enter Electricity Rate
Input your local electricity rate in dollars per kWh (the US average is approximately $0.15/kWh, but rates range from $0.10 in some Southern states to over $0.40 in Hawaii and parts of California). This converts wattage and hours into a dollar cost.
Review PSU Recommendation and Solar Offset
The recommended PSU wattage (system draw + 30% headroom) appears at the top with ATX 3.0 advisory for high-wattage GPUs. Scroll to the Solar Bridge section to see how many panels offset the annual consumption and compare efficiency tiers on cost.
Built for Every Solar Professional
Residential Load Analysis
Customers with home offices or gaming setups often underestimate their PC load. A Creator Workstation running 10 hours daily can consume 1,500–2,500 kWh/year - enough to shift system size recommendation by 1–2 kW. This tool makes that load visible.
Small Business and Co-Working
A small office with 10 workstations running 8 hours daily represents a significant and consistent load - ideal for solar sizing. Use this tool to quantify PC load across a small business installation before adding HVAC and lighting to the total load profile.
PSU Efficiency Upgrade Advice
The efficiency comparison table shows the annual cost difference between Standard and Platinum PSUs. For a high-wattage gaming PC running 8+ hours daily, upgrading PSU efficiency can save $80–$150/year - a payback of under 2 years for the efficiency upgrade cost.
Calculation Methodology
Power consumption is calculated from component TDP ratings, then adjusted for PSU efficiency and usage hours to produce real-world energy cost and solar offset figures.
Total System Wattage
System W = CPU + GPU(s) + RAM + Storage + Cooling + Mobo + Peripherals Each component contributes its rated wattage. CPU overclocking adds 25%. GPU count multiplies TGP. Motherboard base draw is a fixed 30W not shown in component fields.
Recommended PSU Wattage
PSU = System W × 1.30 (rounded to next PSU tier) 30% headroom is the "Recommended" tier. 10% is the minimum. 50% is future-proof. ATX 3.0 with native 12VHPWR is advised when GPU TGP is 300W or higher to handle microsecond power spikes safely.
Wall Power Draw
Wall W = System W ÷ PSU Efficiency % (blended load) Wall draw uses a blended load model: 70% gaming load + 30% idle at 0.25× system draw. This reflects real-world usage patterns better than assuming constant peak draw throughout the usage period.
Solar Panels Needed
Panels = Daily kWh ÷ (4.5 peak hrs × 0.4 kW × 0.80 derating) Based on 400W panels at 80% derating factor across 4.5 peak sun hours (US average). Adjust for your location: Southern California averages 5.5–6.0 peak hours; the Pacific Northwest averages 3.5–4.0.
Pro Tips for PC Load Analysis
Use a Kill-A-Watt Meter to Verify
TDP ratings are maximum thermal design ratings, not average draw. A Kill-A-Watt meter plugged into the PC's power strip gives the actual average draw under real usage. For proposal purposes, the calculator's estimate is a good upper bound - real consumption is often 20–30% lower than TDP-based calculations.
Account for Monitor Power Separately
A 27-inch 4K monitor draws 35–60W, and a multi-monitor setup adds 100–180W on top of the PC. This calculator covers the PC tower - add monitor wattage to your total load profile for the solar system sizing calculation to avoid undersizing.
Model the GPU Upgrade Path
Customers often plan to upgrade their GPU in 2–3 years. Run the calculator with the current GPU and again with the planned future GPU. If the jump is from a 200W to a 450W card, the annual electricity cost difference is significant and may justify upsizing the solar system today rather than adding panels later.
High-End Gaming Rigs Warrant a Dedicated Solar Circuit
A high-end gaming PC (RTX 5090 + i9, running 8 hours/day) consumes 1,800–2,500 kWh/year - roughly 15–20% of an average home's annual usage. Treating it as its own load category in a proposal, with a dedicated solar panel allocation, makes the ROI of the solar system easier for the customer to understand and verify.
Frequently Asked Questions
How many solar panels does it take to power a gaming PC?
It depends heavily on the GPU and daily hours. A mid-range gaming PC (RTX 4070, i5, 5 hours/day) draws roughly 350–450W and consumes about 650–820 kWh/year. At 4.5 peak sun hours and 80% derating, that requires 1–2 standard 400W panels to offset. A high-end setup (RTX 5090, i9, 8 hours/day) may need 4–6 panels. Use this calculator with your specific components and hours for an accurate result.
What PSU wattage do I need for my build?
Add up the TDP of your CPU plus the TGP of your GPU, then add 100–150W for the rest of the system (RAM, storage, fans, motherboard). Multiply that total by 1.3 for 30% headroom - this gives you the "Recommended" PSU wattage. For a high-end GPU at 300W or more, choose an ATX 3.0 PSU with a native 12VHPWR connector to handle transient power spikes safely. The calculator does all of this automatically when you enter your components.
How much does it cost to run a PC per month?
At the US average electricity rate of $0.15/kWh, a mid-range gaming PC running 5 hours/day costs roughly $8–$12/month. A high-end creator workstation or dual-GPU machine running 10 hours/day can cost $25–$50/month. At California rates of $0.35–$0.45/kWh, those same numbers are $18–$28/month and $60–$120/month respectively. Enter your local rate and usage hours to get the exact figure for your system.
Is a Gold PSU worth it over Bronze?
For light use (2–3 hours/day), the electricity cost difference between Bronze (85% efficient) and Gold (90% efficient) is small - under $10/year for most builds. For heavy use (8–14 hours/day) on a high-power system, the gap grows to $30–$80/year, and a Gold PSU typically costs only $20–$40 more than an equivalent Bronze model. Gold pays for itself in electricity savings within 1–2 years under heavy use. The efficiency comparison table in this calculator shows the exact annual cost difference for your specific build.
What is ATX 3.0 and do I need it?
ATX 3.0 is the updated power supply specification designed for modern high-power GPUs. These GPUs can spike to 150–200% of their rated TGP for microseconds during intensive workloads. A standard PSU can fail or trigger over-current protection during these spikes, causing system crashes. ATX 3.0 PSUs with a native 12VHPWR (or 12V-2x6) connector are designed to handle these transient spikes. This calculator displays an ATX 3.0 warning whenever your GPU TGP is 300W or higher - which covers most RTX 4080/4090/5080/5090 builds.
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