KNOWLEDGE / PRACTICAL GUIDES
Solar, construction and land mapping: useful first checks
Three practical guides with worked examples, plus a real Bhon Road GIS case study updated with water and orchard planning. Start with your own inputs and understand what an estimate can tell you.
How to use the Solar and Construction calculators
Open the calculator and work through the available project inputs. Check the access notice inside each calculator for the current free-access offer or member requirements.
- Open a calculator below and read the current access notice. Use the public mode where available; if a mode requires member access, follow the instructions shown in the tool.
- Select the mode and enter actual project data. Check the units, scope and assumptions before running a calculation.
- Review the result, included items and assumptions. Check the access or usage meter shown in the calculator before requesting another result.
- Save your inputs and result when ready, then review the estimate with the relevant professional.
The tool’s current access notice takes priority over older tutorials. Managed websites, branded calculators and professional project services have their own scope and terms.
Explore calculators and access →Solar calculator: bill units, loads and backup
- Prepare: monthly bill units, city, daytime use and backup needs.
- Project inputs: enter bill units or appliance loads, then check the indicative system size and panel count.
- Advanced: select the detailed mode and follow its current access notice. Work through appliance loads, roof details, panels, inverter, battery and custom rates.
- Review: compare ROI and cost assumptions, then review and save the completed result.
Read the solar-load example below if you need to understand watts, daily energy or backup before entering inputs. See the solar sizing method and rounding rules and how to check equipment and tariff assumptions.
Open Solar calculator → Read the solar calculator guide →Construction calculator: covered area to detailed BOQ
- Prepare: city, covered area on each floor, number of floors and selected scope.
- Project inputs: enter the covered floor areas and selected scope, then review the budget summary.
- Advanced: follow the current access notice and work through structure, materials, finishing, labour and editable rates.
- Review: read BOQ quantities and assumptions alongside your drawing, then review and save the result.
Plot area and covered floor area are different. Use the construction-scope guide below to compare quotations consistently. See 5, 7 and 10 Marla covered-area examples and how quantities, margin, fees and contingency form the total.
Open Construction calculator → Read the construction calculator guide →1. Solar planning: start with energy, then backup
A monthly rupee bill alone does not describe your appliances or backup needs. Gather monthly electricity units from the bill, identify daytime use, and list the loads that must run during an outage. Keep energy use and maximum simultaneous power separate.
A simple appliance example
| Load | Assumed power | Hours/day | Energy/day |
|---|---|---|---|
| 4 fans | 4 × 60 W | 8 | 1.92 kWh |
| 6 lights | 6 × 10 W | 5 | 0.30 kWh |
| TV | 100 W | 3 | 0.30 kWh |
| Router | 15 W | 24 | 0.36 kWh |
For these illustrative loads, daily energy is 2.88 kWh: watts × hours ÷ 1,000. The assumed maximum simultaneous power is 415 W. This example excludes a fridge, AC, motor starting demand and equipment losses; use actual appliance ratings and realistic run times for your own list.
Keep backup as a separate question
If the loads you want to back up average 300 W for four hours, their energy requirement is 1.2 kWh before losses and battery operating limits. That is a load-energy calculation, not a battery purchase recommendation. Ask the installer to check usable battery energy, inverter compatibility, surge demand and installation conditions.
In the calculator, use bill units or appliance inputs as available, then check roof space, daytime use and backup expectations. Treat the result as a planning estimate and obtain a site-specific equipment and installation review.
Use the solar calculator2. Construction cost: compare the same scope
Two quotes can look very different because they cover different work. Start with covered floor area, number of floors, structural drawings, site conditions, finish choices and a clear division between materials and labour. Plot size alone is not the total covered area.
Write the assumptions before the rate
For an illustrative two-floor house with 1,000 sq ft covered on each floor, the combined covered area is 2,000 sq ft. A broad area estimate multiplies that area by a stated rate, but the rate is meaningful only if its scope is defined. This guide does not quote a current market rate.
| Compare | Questions to record |
|---|---|
| Structure / grey work | Are excavation, foundation, RCC, masonry, roof treatment and basic services included? |
| Finishes | Which flooring, doors, windows, sanitary fittings, paint and electrical fixtures are specified? |
| Site work | Are retaining work, boundary walls, access, water storage and outside connections included? |
| Commercial scope | Who supplies each item? How are quantities, changes, payment stages and exclusions recorded? |
A bill of quantities separates the work into items and measured quantities. Check that each rate matches its unit and specification, then compare the same items across quotations. Drawings, professional quantity review and actual supplier quotations provide the next level of detail.
Use the construction calculator to explore your inputs. Keep its estimate beside a written assumption list rather than treating it as an agreed contractor price.
Use the construction calculator3. Land mapping: distinguish the outline from the evidence
A mapped outline is useful for discussion, but it does not by itself confirm title or a legal boundary. An old PDF can have an unknown coordinate system, a satellite image may show features from a different date, and field GPS points can carry positional uncertainty.
- Keep the original map and GPS export unchanged.
- Record the coordinate system, units, data source and date where known.
- Distinguish measured points, interpreted lines and proposed features.
- Check gaps, overlaps, joins and excluded parcels before reporting area.
- Calculate area in an appropriate projected coordinate system, then state the units and conversion used.
- Keep model-derived contours and drainage separate from measured ground levels.
The Bhon Road draft used 1 acre = 8 kanal and independently converted stored square-metre areas into both units. Rounding only at the final display stage avoided inconsistent totals. Keep the local land-record convention explicit when applying an area conversion to another project.
A 5 m contour interval drawn from a 30 m surface model does not mean the terrain was surveyed to 5 m accuracy. Map presentation can improve readability while the underlying evidence remains unchanged.
Read the Bhon Road case study Explore the ten-acre water-planning case study →How these guides were prepared
Pulse Hatch editorial guidance with illustrative arithmetic examples and a documented project workflow. The examples do not establish current equipment prices, construction rates, legal parcel limits or engineering design approval. The original six-map mapping example is based on the Bhon Road V16 draft pack; the linked case study also summarises the later V20 preliminary site water and orchard plan issued 13 October 2026.
Have a correction or a question? Send it to the official Pulse Hatch desk. A useful brief includes your actual inputs and the decision you need to make.
Questions before your next step
Are calculators available without an account?
Read the current access notice in the Solar or Construction calculator. Public modes can be used without an account when offered; member-only features show their sign-in and access requirements in the tool.
Tools & access →Is a calculator result a final professional approval?
A result supports planning using your supplied inputs. Site conditions, drawings and equipment need the relevant professional review before execution.
Find professional support →How do I request help with my project?
Share your goal, city, existing material and required work. The official desk confirms availability, scope and price before work starts.
Send a project brief →