He arrived from Addis Ababa with a notebook and a pen, and he used both. Not a quick showroom walk: a slow comparison, datasheet in one hand and a sample in the other. What he wrote down is a useful checklist for any buyer in a hot, high-sun market.

1. Panel Efficiency, Not Panel Size

His first question was about panel efficiency rather than wattage. A larger panel is easy to print on a brochure; a panel that still charges in intense heat and dust is harder to guarantee. He compared the module specifications and asked how output is verified before assembly.

2. Battery Chemistry and Heat

High daytime temperatures are daily reality in his region, so battery behaviour mattered most to him. We explained why LiFePO4 lasts longer than older chemistries in heat, and what the charging profile does when the pack is already warm. He wrote down the cycle-life figure and the operating temperature range, not just the amp-hour number.

3. Housing and Sand

He ran a hand along the die-cast aluminium, checked the gasket groove and asked how the coating survives sand abrasion. Rust and dust are the two failures his customers complain about, and both start at the surface.

4. Service Access

Then he asked the question that separates a project buyer from a reseller: if a driver fails in year three, what does the repair look like? The answer — a replaceable module, a part number and a service kit mattered more to him than a discount.

5. The Factory Floor

Last, he walked the line. He watched the aging rack, asked how long units run before packing, and looked at the failure log. A factory that documents its failures is more convincing than one that claims none.

“I can read a datasheet at home. I came here to see whether the datasheet is true.” — Buyer, Addis Ababa

He left with two sample units and a short list of questions for his engineers. That is a good outcome: not a signature on the day, but a buyer who now knows exactly what he is comparing.

For suppliers, the lesson is simpler. A notebook buyer is not difficult. He is the customer who will still be ordering in five years, because he bought with his eyes open.