Specialist solar panels for schools in Sleaford
What decides a solar scheme at a Sleaford school is how much of the output the site uses itself, not how much the roof makes. We arrange the roof survey, model the output against the school's own half hourly consumption, and set out the funding routes.
25.7% of the modelled year lands in July and August, on a roof that returns 898 kWh per kWp a year. The worked example below runs at 180 kWp, the size applied for at the nearest school scheme on record. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Book a roof survey in Sleaford- 1 teaching block
- 2 hall and kitchen
- 3 sports hall
- 4 1960s block, no array
- first phase
- later phase
Illustrative layout for an estate of this size. The array is drawn at about 345 kWp, roughly 53 percent of the 650 kWp these three roofs would hold, because a school sizes to the load it can use in term time rather than to the roof it has: generation it cannot use is exported at a much lower rate than it pays to import. The hatched block carries no array because its structure has not been assessed, which on a school of that era is the usual starting point rather than an exception. Your own figures, and which of your blocks can take an array, come from the roof survey.
Solar for education buildings across Lincolnshire
A one kilowatt-peak array on a shallow pitched roof in Sleaford models at 898 kWh a year, from modelled irradiation of 1,145 kWh per square metre in the plane of the array (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). Against a mean of 886 kWh per kWp across the towns we cover, Sleaford is unremarkable, which is the useful finding: the scheme will be decided by the load curve, not the map.
Scaled up, a 180 kWp array, sized to what the nearest school scheme on record applied for, 30 miles away at Arnold, models at about 161,600 kWh a year before shading, and needs roughly 535 square metres of clear roof. We take the size from the nearest real application rather than a round number, so the example is anchored to something a planning officer has already seen.
Spread across the year that is about 41,500 kWh landing in July and August and roughly 7,900 kWh across December and January. National Grid Electricity Distribution sets what may go back onto the network here, so the July figure is the one worth putting in front of a governing body first.
Sleaford ranks 3 of 8 towns we cover in Lincolnshire on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 861 to 906, a spread of 45 kWh per kWp. On a 500 kWp array that is about 22,500 kWh a year between the strongest and weakest town in the county.
School solar on record near NG34
No school or college solar scheme appears in the NG34 postcode district in the Renewable Energy Planning Database. That is a reporting threshold rather than a verdict. The database records generating stations from one megawatt upward reliably and smaller ones patchily, and almost every school array is a fraction of that, so a roof full of panels on a Sleaford secondary could be generating today without ever reaching it.
Look 30 miles out and there is one: Arnold Hill Spencer Academy in Arnold, 180 kWp, applied for by Green Nation Solar Energy, which holds consent and is awaiting construction. None of our doing. It is a public planning record, and the nearest evidence available of how an application like yours is treated around here. Source: Renewable Energy Planning Database, Q1 2026.
Term dates against the Sleaford generation curve
A Sleaford school roof generates most in the weeks its buildings are closed. 25.7 percent of the modelled year lands in July and August alone (EU PVGIS v5.2), and the summer holiday takes roughly six of those nine weeks out of the timetable. July is the single strongest month here at 13.8 percent of the annual total, and it falls almost entirely inside the holiday.
Winter reverses it. December and January between them return 4.9 percent of the modelled year, and that is when the heating, the lighting and a full register are all drawing at the same time. The roof makes 6.2 times as much in July as it does in December, and August alone outproduces December by about 5.4 to one. 74 percent of the year arrives between April and September, and the point of that figure is not that the summer half goes unused, because April, May and June are full teaching months that draw hard. It is that the concentration peaks in the few weeks at the end of it when the building is shut.
Nationally this comes out at about 49 percent of annual generation falling on a session day. A business open every weekday sees roughly 71 percent. The 22 point gap is what a school appraisal has to absorb, and it is much the same in Sleaford as anywhere else.
Daily shape compounds it. A school's load climbs from breakfast club, holds through the teaching day and falls away from about three in the afternoon, while generation is still strong until six in high summer. That is why we size against half hourly meter data rather than against annual consumption: the annual figure hides both problems.
The conclusion is not that a Sleaford school should do nothing. It is that the array should be sized to the load that survives the holidays, which is usually the server room, the catering refrigeration, the ventilation and the hot water, plus whatever the site lets out over the summer. Anything above that line needs storage or an export agreement with National Grid Electricity Distribution to earn its keep.
We set out the full treatment of the school year against the generation curve on the home page, and what it does to a payback figure under costs.
- generated while the school is open
- generated at a weekend or in the holidays
The same figures as a table
| Month | Session days | Output, kWh per kWp | School open | School closed |
|---|---|---|---|---|
| Jan | 20 | 24 | 15 | 9 |
| Feb | 15 | 38 | 20 | 18 |
| Mar | 21 | 74 | 50 | 24 |
| Apr | 12 | 104 | 42 | 62 |
| May | 17 | 123 | 67 | 56 |
| Jun | 21 | 121 | 85 | 36 |
| Jul | 11 | 124 | 44 | 80 |
| Aug | 0 | 107 | 0 | 107 |
| Sep | 20 | 83 | 55 | 28 |
| Oct | 17 | 51 | 28 | 23 |
| Nov | 21 | 30 | 21 | 9 |
| Dec | 15 | 20 | 10 | 10 |
| Year | 190 | 899 | 437 | 462 |
North Kesteven schools, phase by phase
North Kesteven has 55 open state-funded schools and colleges on the DfE register teaching 16,605 pupils between them. Source: DfE Get Information About Schools.
The split is 47 primary, 7 secondary and 1 further education, at an average of 302 pupils a site. Read 6.7 primaries per secondary as a sequencing hint rather than a statistic. A primary is a single survey visit and a modest array; a secondary is several roofs of different ages on one site, and that is where both the area and the complications are.
A trust holding more than one of these sites should look at them together. Grouping the surveys turns the grid question, the funding question and the procurement route into one exercise rather than four, and it usually changes which roof goes first.
Grid connection through National Grid Electricity Distribution
Connections around Sleaford are handled by National Grid Electricity Distribution, which sets the export limit for the site. Above 3.68 kW per phase the connection runs under G99, so the export limit is agreed in advance rather than assumed. Where the local network is constrained, an export-limited connection usually still makes the scheme work, because a school uses most of what the roof makes during the working day.
Across Lincolnshire the planning database records 226 solar schemes totalling 7052 MW, of which 37 are operational (REPD Q1 2026).
Book a roof survey at your Sleaford school
A survey in Sleaford starts with three things from you. Give us the postcode, the approximate roof area and, if you can get it from your supplier, twelve months of half hourly readings. What comes back is a usable area figure per block, output modelled against your own load rather than an average, and the ways a Sleaford school can pay for it.
Lenzie Consulting Ltd arranges the survey and passes your details to an MCS-certified installation partner so they can quote. We do not carry out the installation ourselves.
Sleaford school solar, answered
- Is there enough sun around Sleaford for this to be worth doing?
- The model gives 898 kWh a year for every kWp installed at this latitude, so a 180 kWp array comes out at roughly 161,600 kWh a year before shading. It needs about 535 square metres of clear roof once walkways and rooflight setbacks are allowed for. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
- Does a Sleaford school waste its generation in August?
- 25.7 percent of the modelled annual output for Sleaford falls in July and August, when the buildings are closed for most of six weeks (EU PVGIS v5.2). It does not go to waste, but it only has three places to go: the base load that runs regardless, such as servers, catering refrigeration and ventilation; storage; or export under an agreement with National Grid Electricity Distribution. We model all three against your half hourly data before an array is sized.
- Will the network around Sleaford accept the export?
- National Grid Electricity Distribution is the distribution network operator for Lincolnshire. Anything above 3.68 kW per phase connects under G99, and the application fixes the export limit. On a school site the incoming supply is often the binding constraint rather than the roof, so we ask that question before anyone sizes an array.
- Is planning permission needed for panels on a school in Sleaford?
- Usually permitted development covers a roof array on a school, with prior approval from North Kesteven needed above a capacity threshold. A ground mounted array in the grounds is a different question and much more likely to need a full application. We check both before design sign-off.
- How many schools are there around Sleaford?
- North Kesteven has 55 open state-funded schools and colleges on the DfE register, with 16,605 pupils on roll. Source: DfE Get Information About Schools. We survey across the whole of that area, and where a trust holds several sites we look at them in one pass.