Off-grid solar has been reinvented at least three times since NewGrid's founder started building it in the early 1990s. The panels get most of the attention, but the real story is in everything behind them: the batteries, the electronics, and the way the whole system is put together. Here's how it changed, from someone who was there for all of it.
The Photocomm Era
Lead-acid and a generator that never rested.
In the early '90s, off-grid meant a bank of lead-acid batteries, a temperamental charge controller, and a generator running most of the time to cover the gap. Will Herndon started his career at Photocomm, the leading off-grid firm of the day, doing sales, design, engineering, and construction. Systems were small, maintenance was constant, and "off-grid" mostly meant "makes do."
Water
The water years, and SunPumps.
One branch of off-grid solved a different problem: moving water. Solar-direct pumping sends power straight from the panels to the pump motor while the sun is up, and stores water in a tank instead of electricity in a battery. Will spent years specializing in it and owned SunPumps, a leading name in the field. Ranches and remote sites still run this way today because it's simple and there's almost nothing to break.
The Grid-Tie Boom
The industry got pulled the other way.
In 2000, Will co-founded American Solar Electric and built it to $30M in annual revenue before selling in 2014, riding the rooftop grid-tie wave that took over the market. Off-grid stayed a specialty for the people who couldn't get a utility line and wouldn't settle for a generator.
The Lithium Leap
Lithium changed the math.
Around 2015, lithium iron phosphate batteries started replacing lead-acid, and the difference was night and day. Ten-year warranties instead of three. No watering, no monthly hydrometer checks, no wiping down 24 battery terminals. One of our clients calculated they'd spent roughly 300 hours maintaining a lead-acid bank over 15 years. Lithium erased that overnight.
The Microgrid Era
One power plant for a whole operation.
Off-grid stopped meaning "one building" and started meaning one power plant for a whole operation. A microgrid controller coordinates solar, storage, and generators from different manufacturers as a single system, which is how a copper mine's communications network runs at 100% uptime and a private island off Panama runs dozens of villas on 2 megawatt-hours of storage.
The throughline across 35 years: the physics got easier and the engineering got harder. Panels are a commodity now. What separates a system that lasts from one that limps is how it's designed and who stands behind it.