Comparison

Solar Panel Calculator Plus vs Construction Calc Pro 7

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Solar Panel Calculator Plus

Calculate custom off-grid solar home power systems. Determine the exact number of solar panels and battery capacity needed for your energy usage. Helps plan system size, inverter requirements, and battery bank specifications.

Highlights
  • Calculate solar panel requirements
  • Determine battery capacity
  • Calculate inverter size
  • Estimate daily energy usage
  • Plan days of autonomy
  • Optimize battery life calculations
Features
Read full description

Solar Panel Calculator Plus calculate custom Off-Grid Solar Home Power Systems. Use these handy calculator to help decide which system size is right for you. You can calculate the Exact Number of Solar Panels You Need For Your Usage Plus the Space you need. Also include Battery Capacity for your Home Power Systems. Daily energy use: Find the energy used in a day. Figure out how long each electronic device will be run in hours during a day. Multiply the wattage of each device by its run-time to get the energy in watt-hours per day. Add up all the watt-hour values to get a total for your home. Example: Light bulbs run for 5 hours a day. Computer runs for 2 hours a day. 100 x 5 + 300 x 2 = 1100 watt-hours. Inverter size: To determine the inverter size we must find the peak load or maximum wattage of your home. This is found by adding up the wattage of the appliances and devices that could be run at the same time. Include everything from microwaves and lights to computers and clocks. The sum will tell you which inverter size you need. Example: A room has two 60 watt light bulb and a 300 watt desktop computer. The inverter size is 60 x 2 + 300 = 420 watts. Multiply with 1.2 or 1.5 into a safe area. Days of autonomy: Now decide how many days worth of energy you want to store in your battery bank. Generally this is anywhere from two to five. Battery bank capacity: Example: You want the battery bank to last three days without recharging and that you use 5.0 kwh per day. As 5.0 x 3 x 2 = 30.0kwh, this is the energy we need from the batteries. Converting this to AH we have to divide by the voltage of your system. This can be 12, 24 or 48 for commercial application. If we choose to use 48V, the minimum AH capacity is then 30 000/48 = 625 AH. Now if you divide by your battery's rating you find the number of batteries you must use. The larger the system you have, the higher the voltage you should have. It is normal to match a 12 V battery bank to a 400 W power system. A 5 kW system would work most appropriately with a 48 V wiring system, in order to decrease current flow in the wires. Note: All calculations assume only a 50% discharge to your batteries to optimize battery life. Note: Colder temperatures have a negative effect on the capacity of your battery bank. If your battery bank is always indoors in a heated area then you don't have a problem. But if they're stored in an unheated area during the winter then you'll need to account for this. Solar Panel: The most typical solar panel size used for residential installations is 65 inches by 39 inches. And the wattage output range from 200 - 330 watts. *Thanks for your support, stay tune for more update to come

About

Construction Calc Pro 7

This app offers a comprehensive suite of 82 construction calculators for various tasks like concrete, drywall, and roofing. It allows measurements in both imperial and metric units and features a high-visibility display for use in direct sunlight.

Highlights
  • 82 construction calculators
  • Imperial and metric measurements
  • High visibility display
  • Aggregate, asphalt, concrete calculations
  • Drywall, flooring, framing tools
  • Paint, rafter, roofing calculators
Features
Read full description

83 Powerful, Proven & Precise Tools. Enter measurements in feet/inches or metric. There is no complicated manual to master or instructions to follow, just enter data and get precise results. HIGH VISIBILITY IN DIRECT SUNLIGHT White on black text, with blue and orange inputs and outputs for high visibility in direct sunlight. CALCULATORS INCLUDE: AGGREGATE Inputs: Width, Length, Thickness, Density, Wastage Outputs: Weight, Volume ASPHALT Inputs: Width, Length, Thickness Outputs: Weight, Volume BALUSTERS Inputs: Run length, Baluster width, Baluster spacing Outputs: Qty of balusters, Qty spaces, Baluster spacing (center-to-center), Baluster spacing (edge-to-edge), Measurements to far side of each baluster BOARD / LINEAL FOOT Inputs: Thickness, Width, Length, Quantity Outputs: Board feet, Lineal feet CONCRETE Inputs: Width, Length, Thickness, Use rebar option, Rebar spacing along width, Rebar spacing along length Outputs: Volume, 60lb premixed bags, 80lb premixed bags, 10kg premixed bags, 25kg premixed bags, 50kg premixed bags, Rebar required CROWN MOULDING Inputs: Wall angle (corner of wall), Crown (spring) angle Outputs: Miter angle, Bevel angle DROP CEILING Inputs: Length at ceiling, Width at ceiling, Tile size, Distance (anchor to drop ceiling) Outputs: Ceiling area, Ceiling tiles, Perimeter moulding, Main supports, Tee support peices, Wire length (each), Wire length (total), Wire anchors DRYWALL Inputs: Room width, Room length, Room height, Panel width, Panel height, Include ceiling option Outputs: Area - surface area. Materials - Drywall panels. Joint compounds - Readymixed, Lightweight readymixed, Setting-type, Lightweight setting-type. Fastener - Drywall nails, Drywall screws. Additional items: Joint tape, Primer, Adhesive FLOORING Inputs: Width, Length, Wastage, Square Ft or M per box Outputs: Total area, Boxes needed FRAMING Inputs: Total wall length, Qty of windows, Qty of doors, Qty of corners, Stud spacing (on center) Outputs: Studs required LINEAR COST ESTIMATOR Inputs: Single panel length, Qty of panels, Cost per linear foot, Cost per linear meter Outputs: Total cost, Total length PAINT Inputs: Wall length, Wall height, Number of coats, Surface type Outputs: Gallons required, Liters required RAFTER Inputs: Run, Pitch (/12") Outputs: Rafter length RISE/RUN/ANGLE Inputs: Rise, Run, Angle (Enter rise and either run or angle) Outputs: Angle, slope, Run ROOFING Inputs: Width, Length, Pitch, Sq ft or M per pack, Type, Nails, Safety margin Outputs: Roof surface area, Packs needed, Nails SQ COST ESTIMATOR Inputs: Width, Length, Cost per Sq ft or M Outputs: Total cost, Total area, Total area (acres)

Screenshots

Solar Panel Calculator Plus4 screens
Construction Calc Pro 74 screens

Verdict

The call

The clearest difference is price: Construction Calc Pro 7 at Free against Solar Panel Calculator Plus's $2.99. Construction Calc Pro 7 also leads on rating (4.3 vs 3.3) and update cadence (every 2 months vs every 47 months). Solar Panel Calculator Plus's advantage is in-app purchases (none vs 1) and ads (none vs shown). On review sentiment, ratings volume and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Construction Calc Pro 7 is free to download; Solar Panel Calculator Plus costs $2.99 up front. Construction Calc Pro 7 sells 1 one-off in-app purchase. Solar Panel Calculator Plus asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Construction Calc Pro 7 holds the better App Store score, 4.3 against 3.3. Both are backed by a comparable volume of ratings — 23 and 28 respectively. Written reviews split almost evenly too, at 25% and 25% positive.

UpkeepUpdate frequency

Solar Panel Calculator Plus ships an update every 47 months, Construction Calc Pro 7 every 2 months. The most recent releases landed on October 27, 2026 and October 8, 2026 respectively.

Scorecard7 real differences · 3 level
Solar Panel Calculator Plus versus Construction Calc Pro 7: the parameters behind the verdict, then further details
ParameterSolar Panel Calculator PlusConstruction Calc Pro 7
Price$2.99Free — better
Rating3.3 (23 ratings)4.3 (28 ratings) — better
Positive reviews25.0% of reviews25.0% of reviews
Number of ratings2328 — better
Update frequencyEvery 47 monthsEvery 2 months — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.6
Further details — not scored
Size8 MB88 MB
Age rating4+4+
DeveloperNitrioTroy Knight

Customer experience

Solar Panel Calculator Plus

All ratings23 ratings
Positive52.2%
Neutral4.3%
Negative43.5%
Written reviews4 reviews
Positive25.0%
Neutral25.0%
Negative50.0%

Construction Calc Pro 7

All ratings28 ratings
Positive78.6%
Neutral7.1%
Negative14.3%
Written reviews8 reviews
Positive25.0%
Neutral37.5%
Negative37.5%

In-app purchases

None

Solar Panel Calculator Plus

No in-app purchases

1 purchases

Construction Calc Pro 7

One-time1
  • Premium ad-free version$3.99

Questions

Is Solar Panel Calculator Plus free?
Solar Panel Calculator Plus costs $2.99, with no in-app purchases.
Is Construction Calc Pro 7 free?
Construction Calc Pro 7 is free to download, with in-app purchases available.
Which has better reviews, Solar Panel Calculator Plus or Construction Calc Pro 7?
Construction Calc Pro 7 is rated higher. Solar Panel Calculator Plus averages 3.3 out of 5 from 23 ratings, while Construction Calc Pro 7 averages 4.3 from 28 ratings.
Do Solar Panel Calculator Plus or Construction Calc Pro 7 have ads?
Construction Calc Pro 7 shows ads; Solar Panel Calculator Plus does not.
Which is updated more often, Solar Panel Calculator Plus or Construction Calc Pro 7?
Solar Panel Calculator Plus ships an update every 47 months, and Construction Calc Pro 7 every 2 months. Most recently, Solar Panel Calculator Plus was updated on October 27, 2026 and Construction Calc Pro 7 on October 8, 2026.

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