Solar & battery
Solar Truck Capacity Calculator
Works what a vehicle can carry, where weight binds before volume.
Result
Payload is the manufacturer's rating less the weight of crew, fuel and anything permanently mounted, which is often far less than the brochure figure. Overloading is a legal and safety matter, not an efficiency question, and glass in transit needs proper dunnage and strapping whatever the arithmetic says.
Get a Free Business AuditHow the calculation works
The weight and volume of modules, racking, inverters and balance of system against the vehicle's payload capacity and cargo space. Modules are heavy and awkward rather than dense, so both limits matter, and payload is usually reached first on a residential array.
What moves the number
- Module weight and count.
- Racking and balance of system weight.
- Vehicle payload capacity, not its gross weight rating.
- Crew, tools and equipment already aboard.
Where this one goes wrong
Payload capacity is the gross vehicle weight rating less the vehicle's own weight including fuel, crew, tools and anything permanently mounted, which is considerably less than the rating suggests, and overloading is both unsafe and an enforcement matter. Work from payload rather than from the rating. Modules also need securing against damage as well as movement, since a module that arrives with microcracks produces less and the damage is not always visible.
Before you quote
- Calculate payload after crew, tools and permanent equipment.
- Check both weight and volume limits.
- Secure modules against damage, not only against movement.
Questions
About this calculator
How much can a truck actually carry?
Its gross weight rating less its own weight including fuel, crew, tools and permanently mounted equipment, which is considerably less than the rating implies. Overloading is unsafe and an enforcement matter, so the payload figure is the one to work from.
Does weight or volume bind first?
Usually weight on a residential array, since modules and racking are heavy. Both limits are worth checking though, because modules are awkward enough that a load can fill the space available before reaching the payload limit.
How should modules be secured?
Against damage as well as movement, since a module that arrives with microcracks produces less and the damage is frequently invisible. Transport damage that shows up as underperformance months later is difficult to attribute and expensive to resolve.
The formula
panels per trip = the lower of payload allowance and usable length; trips = panels / per trip
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How to use this calculator
- Panels to carry. Enter your own figure; the page starts at 18.
- Weight per panel (lb) (lb). Enter your own figure; the page starts at 48 lb.
- Panel thickness packed (in) (in). Enter your own figure; the page starts at 2.2 in.
- Truck payload (lb) (lb). Enter your own figure; the page starts at 3,000 lb.
- Usable bed or box length (ft) (ft). Enter your own figure; the page starts at 12 ft.
- Racking, inverters and tools (lb) (lb). Enter your own figure; the page starts at 700 lb.
The result updates as you type, so you can try a figure, see what it does to trips needed, and change it back. Nothing you enter is sent anywhere or saved.
A worked example
These are the figures the calculator opens with. Every number in the results column below is produced by the same calculation the page runs, so you can follow it through before putting your own figures in.
What goes in
| Input | Value |
|---|---|
| Panels to carry | 18 |
| Weight per panel (lb) | 48 lb |
| Panel thickness packed (in) | 2.2 in |
| Truck payload (lb) | 3,000 lb |
| Usable bed or box length (ft) | 12 ft |
| Racking, inverters and tools (lb) | 700 lb |
What comes out
| Result | Value |
|---|---|
| Trips needed main result | 1 |
| Total load | 1,564 |
| Panels the payload allows | 47 |
| Panels the space allows | 55 |
| Payload used | 52.1% |
1 trip(s). The limit is payload: the truck takes 47 panels by weight and 55 by space. Total load is 1,564 lb.
How sensitive the answer is
Holding everything else steady and changing only panels to carry, this is what happens to trips needed. It is worth knowing which of your inputs the answer actually hinges on, and which barely move it.
| Panels to carry | Trips needed |
|---|---|
| 9 | 1 |
| 14 | 1 |
| 18 example above | 1 |
| 27 | 1 |
| 36 | 1 |
Every other input is held at the example value while this one changes, which is not how a real job behaves. Treat it as a guide to which number matters most, not as five separate quotes.
What each figure means
- Panels to carry
- A number, between 0 and 2000, starting at 18.
- Weight per panel (lb) (lb)
- Measured in lb, between 0 and 200, starting at 48 lb.
- Panel thickness packed (in) (in)
- Measured in in, between 0 and 12, starting at 2.2 in.
- Truck payload (lb) (lb)
- Measured in lb, between 0 and 60000, starting at 3,000 lb.
- Usable bed or box length (ft) (ft)
- Measured in ft, between 0 and 60, starting at 12 ft.
- Racking, inverters and tools (lb) (lb)
- Measured in lb, between 0 and 20000, starting at 700 lb.
What the results tell you
| Result | What it is |
|---|---|
| Trips needed | The headline result. A number. |
| Total load | A number. |
| Panels the payload allows | A number. |
| Panels the space allows | A number. |
| Payload used | A percentage. |
A design still needs a site visit
Output and sizing figures use the assumptions you enter, not measured irradiance, shading or roof orientation at your address. Real production depends on all three, plus inverter behaviour and local interconnection rules.
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