Running a solar installation business: quotations, sales models, stock and serial numbers, tax and e-Tax
Solar jobs chain sales, site work, serial-tracked stock and accounting. What installer software must cover, and how to pick one you won't outgrow.
Thailand's rooftop solar tax deduction (Royal Decree 805) for installers: which systems qualify, what to collect and how to issue the e-Tax Invoice.
What a winning solar quotation must show: equipment, savings, warranties and payment terms, plus how to price without losing money and manage revisions.
Four ways to sell solar compared: who owns the system, when the installer is paid, the risks and the accounting, and how to match the model to the customer.
Control panel, inverter and battery stock so warranty claims succeed and job profits are right: serial tracking, stores by condition and FIFO lot costing.
