Solar Dryer Sizing & Tray Area, Trays & Throughput
Dries fruit
Enter batch weight, load per square metre and drying days to get the dryer area, trays and daily throughput— drying produce faster and cleaner than open sun-drying.
Size your solar dryer
Next: build or buy a dryer with about 25 m² of tray area (25 trays); spread produce in a single thin layer for even, hygienic drying.
Loading density depends on the crop and slice thickness; thinner spreads dry faster but need more tray area. Allow extra capacity for staggered batches.
Solar dryer sizing — key facts
- Dryer area
- batch ÷ load per m²
- Throughput
- batch ÷ drying days
- Load per m²
- thin, even layer per crop
- Versus sun
- faster, cleaner, better grade
- Dries
- fruit, veg, spices, grain
- Siting
- open, sunny, good airflow
- Plan
- spare trays & staggered cycles
- Privacy
- Runs in your browser; nothing uploaded
Dry the harvest clean, fast and to a better grade
Spreading produce on the open ground is cheap but exposed — dust, rain, insects, birds and uneven drying drag down quality and waste a chunk of the crop. A solar dryer fixes that with an enclosed, sun-heated space and good airflow, drying faster and cleaner for a better grade and a better price. The trick is to build it the right size: too small and the harvest backs up, too big and you've spent on space you never fill.
This tool sizes the dryer from your batch — giving the tray area, number of trays, batch weight and daily throughput from your load per square metre and drying days. Use it to design or buy the right dryer and plan how much you can process each day. Pair it with the Crop Drying Time, Dehydration Ratio and Drying Yard Area calculators for a complete post-harvest plan.
Size it right
Match tray area to your batch weight.
Plan the throughput
Know how much you can dry per day.
Beat open sun-drying
Cleaner, faster, higher-grade produce.
Cut post-harvest loss
Keep dust, rain and pests off the crop.
Frequently Asked Questions
What is a solar dryer?+
A solar dryer is an enclosed structure — a cabinet, tunnel or tent with trays — that uses the sun's heat and controlled airflow to dry produce faster and far cleaner than spreading it on the open ground. It keeps out dust, rain, insects and birds, holds higher drying temperatures, and protects quality, which is why it's widely used for fruit, vegetables, spices, grain and herbs.
How is the dryer size calculated?+
Size it by the batch weight and how much produce loads onto each square metre of tray. Dryer (tray) area = batch weight ÷ load per square metre. The number of trays follows from the area, and the drying days set the throughput per day — roughly the batch divided by the days it takes to dry. Enter your figures and the tool returns area, trays, batch and daily throughput.
What is load per square metre?+
It's how many kilograms of fresh produce you can spread on one square metre of tray in a thin, even layer that still dries properly. Overloading slows drying, causes uneven results and risks spoilage. The right load depends on the crop and slice thickness — leafy and sliced produce loads light, denser items a little heavier — so use a figure suited to what you're drying.
Why is the drying time important?+
Drying days set how fast each batch clears the trays, and therefore your daily throughput. A dryer that holds two days' worth of trays but takes three days to dry a batch can't process a fresh batch every day. Matching tray area, batch size and drying days keeps produce moving through without bottlenecks during a busy harvest.
Why use a solar dryer over open sun-drying?+
Open sun-drying is cheap but slow, exposed to dust, rain, droppings, insects and theft, and gives uneven, often lower-grade results. A solar dryer dries faster at higher, more even temperatures inside a clean enclosure, protecting colour, flavour and food safety. Better quality usually fetches a better price, which offsets the cost of building or buying the dryer.
What can I dry in it?+
Almost any harvest that benefits from drying — fruit such as mango, banana and grapes; vegetables like tomato, chilli and okra; spices and herbs; grain and pulses; and even fish in some designs. Each crop has its own load per square metre, target moisture and drying time, so size the dryer for your main crop and adjust trays for others.
Where should I put the dryer?+
Choose an open, unshaded spot that catches sun for most of the day, oriented to the sun's path, with good airflow so moist air carries away. Keep it clear of trees, walls and dust sources, and where you can load and unload trays easily. Good siting can be the difference between drying a batch in days versus stalling for want of heat and airflow.
Does it work for any unit or scale?+
Yes — the maths scales from a small household cabinet to a large commercial tunnel. Just enter your batch weight and a realistic load per square metre, and the tool sizes the tray area and trays to suit. For big operations, plan multiple drying cycles and stagger batches so trays are always working through the harvest.
Are the figures precise?+
They're solid planning figures for sizing the dryer and trays. Actual drying time and throughput depend on the crop, slice thickness, weather, humidity and the dryer's design and airflow. Treat the outputs as your design target, build in some spare tray capacity, and fine-tune loads and cycles once you see how your dryer performs.