Stand-alone photovoltaic systems with battery storage and backup generator for remote sites, vacation properties, and locations across Puerto Rico and the USVI where utility service isn't available — or where you'd rather not depend on it.
Off-grid sounds appealing — own your power, no monthly bill, no grid outages. But the engineering reality is unforgiving: if your system can't meet load at 3am on the fourth cloudy day of a tropical depression, you have no power. There's no utility safety net to fall back on.
That's why off-grid systems demand more conservative engineering than grid-tied or hybrid setups. We size for worst-case scenarios, build in generator backup as a hard requirement, and engineer the load-management logic to keep critical functions running even when production is poor.
Done right, an off-grid system is genuinely liberating. Done wrong, it's a constant headache. Our job is to make sure yours is the former.
Sites where utility extension is impractical or prohibitively expensive — mountain properties, isolated coastal sites, agricultural land, and remote infrastructure facilities.
Properties used intermittently, where consistent occupancy doesn't justify utility service costs. Often combined with smart load management so the system runs efficiently when occupied or unoccupied.
Properties with grid access where the owner wants complete energy independence regardless. Generally more expensive than hybrid, but eliminates utility dependence entirely.
Detailed load audit: what you need, what you'd like, what you'll do without. This is the critical conversation — every kWh of load drives every component of the system. We help separate must-haves from nice-to-haves.
PV array sized for cloud-cover resilience, battery sized for multi-day autonomy, generator sized to recharge under worst-case conditions, and load management designed to protect critical functions.
Self-performed install under PE oversight, including fuel storage and generator pad work where applicable. Battery enclosure or room with thermal management for tropical conditions.
Multi-scenario testing: full autonomy mode, generator-recharge mode, low-battery load shedding. Owner training is critical — off-grid systems require informed operation. Remote monitoring setup for unattended sites.
UL 9540, and UL 9540A. LFP chemistry strongly preferred for thermal stability — off-grid systems often live in remote enclosures with limited active cooling.UL 1741 certification required even without grid connection.NFPA 110 for standby systems where applicable. Auto-start integration, battery charging through hybrid inverter, and fuel storage per NFPA 30.Almost never on a year-one basis. The system cost is significant and the generator + fuel + maintenance add ongoing expenses. Off-grid makes economic sense when utility extension is genuinely impractical (very remote sites), or when the value of independence and resilience justifies the premium for the owner.
For the multi-day cloudy stretches that the Caribbean produces during tropical weather. Sizing a battery for that worst case alone would be prohibitively expensive — adding a generator is far more economical and adds nearly unlimited extension of autonomy through fuel storage. Off-grid without generator backup is realistic only for very small loads or very large budgets.
This is the #1 way owners get into trouble with off-grid systems. Every kWh of added load reduces autonomy. Major additions (new AC unit, electric water heater, EV charger) typically require system expansion. We design with documented headroom and clear load discipline guidance so future decisions are informed.
The system is designed with failure modes considered. Battery failure: generator can run loads directly until repair. Inverter failure: depending on architecture, the system may continue to operate at reduced capacity. Remote monitoring catches issues early. For high-resilience sites we recommend keeping critical spares on-site.
Yes — electrical permits, generator installation permits, and fuel storage permits all apply just as they do for grid-tied systems. The advantage is no utility interconnection paperwork. We handle the regulatory side in-house as part of every project.
Tell us about the site and what you're planning to power. We'll respond within one business day with next steps and an honest assessment of whether off-grid is the right path — or whether a hybrid grid-tied system would serve you better.