Generators

What an inverter generator does that an open-frame one cannot:

deliver steady, clean power for electronics, and do it quietly. An open-frame set, the steel-tube cage with a petrol engine on top, puts out current that wavers with the engine: fine for a drill or work lights, hard on a television or a computer. An inverter converts its output electronically, sits in a closed case, idles down under light load and runs all evening on a small tank in a tight residential street where neighbours would hear an open frame through the wall. Diesel is where a generator becomes fixed equipment. Soundproofed cabinet sets power farms, hotels and clinics and, with an automatic transfer panel, start themselves when the mains drops. Dual-fuel models take petrol or the same propane cylinder as the kitchen stove. If the job is air tools rather than sockets, one of the engine-driven air compressors may be the better buy.

Sizing a generator for the highlands:

starts with the running rating, not the big number on the box. Many generic sets are sold by peak output, held for a moment; the continuous figure on the data plate is what they deliver all night. Add up what runs at once and leave room for motors, since a fridge compressor or a well pump kicks hard at every start. Then allow for height. An engine breathes thinner air as it climbs and loses output steadily, so a set that just covers a corner shop’s freezer and lights at the coast falls short in Quetzaltenango or Totonicapán. Up there, buy a size bigger, and to feed a house have an electrician fit a transfer switch: a set pushed back through a wall socket can put current into the street cable where a lineman is working.

Why a diesel set with an hour meter keeps its price:

it carries its own history. A generic open-frame petrol set of around 5,500 to 7,000 watts costs about Q6,000 to Q11,000 new, and a soundproofed diesel of roughly 10 kW runs around Q45,000 to Q55,000. The cheap open frame loses value fast, because nobody can tell how long it ran or what sat in its carburettor. A diesel with a readable hour meter, a service log and a working transfer panel holds most of its price, and so do Honda and Yamaha inverters, which buyers ask for by name.

A used generator that has to start cold:

tells you most of the story, so ask the seller not to warm it up before you arrive. A petrol set that only runs on choke, or hunts up and down at idle, has a carburettor gummed by fuel left in it for months. Milky oil, or oil that smells of petrol, is a fault, and blue smoke under load means worn rings. Then load it near its running rating with a space heater or an angle grinder, and watch a plug-in meter. Voltage that sags, flickering lights or dead sockets point to the regulator or the alternator brushes; a burnt smell from the alternator vents is worse. Labels lie in this trade. Clone engines copy Honda’s GX design down to the colour, so a Honda sticker proves nothing: look for the maker’s name cast into the engine and a serial number on the block. On a diesel, read the hour meter against the service log, watch for black smoke under load and test the transfer panel by cutting the mains. Brushes, regulators and carburettors turn up under industrial parts.

Listing a generator with its plate, its hours and a load running:

sells it faster than any adjective. Photograph the data plate and the hour meter, and film a cold start followed by a real load. Say how it was stored, whether the fuel was drained, when the oil and plug were last changed, and what goes with it: wheel kit, cover, parallel cable or transfer panel. A corner-shop owner coming from San Marcos will want to watch it hold a freezer and the lights together, so have fuel in the tank and an extension lead ready.