Home / Off-Grid Solar Systems for Homes in San Diego
Off-Grid Solar Systems for Homes in San Diego
Licensed General Contractor · Bonded & Insured · CSLB #1033958
Sized from
Your worst week
Winter load and short days, not summer averages
Storage
Lithium or lead-acid
We show you the real cost per usable kWh, both ways
Mounting
Ground or roof
Footings, racking, and trenching built in-house
Who builds it
A general contractor
Lic. #1033958 — structure and power, one company
Off-grid solar in San Diego County
When the power line costs more than the power
Ask SDG&E what it costs to run service to a parcel a half mile off the road. That number — priced by the foot, plus easements, plus trenching, plus the wait — is the number off-grid solar competes against. On remote land in Alpine, Descanso, Julian, Ramona, Campo, and the backcountry, a complete solar and battery system frequently comes in under the line extension. And at the end of it you own an asset instead of a receipt.
Off-grid is a different engineering problem than a grid-tied roof array, though. Grid-tied systems treat the utility as an infinite battery: overproduce at noon, pull it back at night, never think about it. Off-grid has no such backstop. Every watt you use at 9 p.m. in February has to have been captured and stored on a short, possibly overcast day — which means the design starts with your loads, not your roof.
That is where most off-grid systems go wrong. Undersize the battery bank and you run out in winter. Oversize the array to compensate and you have paid for panels that sit idle eight months a year. The whole job is getting that balance right for how your household actually lives.
Who calls us about this
Three reasons people go off-grid
The engineering is similar. What changes is how much you are willing to spend to never think about power again.
No utility to connect to
Raw land, a backcountry build, or a parcel where the nearest pole is a quarter mile away. Solar plus storage is the whole electrical service, and it has to be designed like one — not bolted on as a supplement.
Cabins and seasonal places
A Big Bear cabin or a weekend property that sits empty half the year. Sized for the weeks you are actually there, with freeze-tolerant equipment siting and a system that does not need you present to stay healthy.
Done with the outage cycle
Grid available, but shutoffs, fire-season de-energization, and rate hikes have worn out their welcome. Usually built as a large battery and array that can island the house — independence without abandoning the meter.
How we design one
The load audit comes before the panel count
Anyone quoting an off-grid system without asking what you plan to run is guessing with your money.
Load audit
Every appliance, pump, and device, with hours of use — plus the big ones: well pump, water heater, range, air conditioning, EV. This becomes your daily kilowatt-hour target.
Site & sun study
We walk the property: solar window, ridge and tree shading, soil for footings, cable runs, and where the equipment can live dry, shaded, and secure.
Array, bank & autonomy
Array sized for December, not June, and a battery bank sized for the days of autonomy you want. You see the tradeoff in writing: more storage, more money, fewer generator hours.
Permits & build
County permits and inspections, footings poured, racking set, panels and conduit run, trenching to the house, then inverters, charge controllers, and the battery bank installed and wired.
Commission & teach
We bring it online, set charge parameters, and then sit down and show you how to read it — state of charge, what to shed on a bad week, and when the generator should run.
In every system
Spelled out in the proposal before you commit
Ground or roof
Where the array goes, honestly compared
On off-grid properties there is usually land available, which changes the math in favor of the ground more often than it does in the suburbs.
Ground-mounted
Concrete footings, steel or aluminum racking, and a trench back to the house. More material and more labor, and usually the better system.
Roof-mounted
Cheaper, because the structure already exists. Right when the roof faces the correct direction, has the pitch, and has plenty of life left in it.
Because we are a general contractor, we can reframe, re-sheath, or repair that roof before the array goes on — in the same project, on the same schedule.
Battery storage
The battery bank is the system
Panels are a commodity. Storage is where the money goes, where the lifespan is shortest, and where a bad decision is felt every single evening.
Lithium (LFP)
The default for new off-grid builds now, and worth the premium in most cases once you compare cost per usable kilowatt-hour rather than sticker price.
Lead-acid (AGM or flooded)
Still a reasonable answer for a seasonal cabin, a tight budget, or a small system — provided you understand what you are signing up for.
Generators, hybrids & real-world output
Designing for the bad week, not the brochure
Off-grid systems are judged in the worst week of the year. Everything below exists to make that week uneventful.
Generator as the last 5%
Building an array big enough to carry a week of December storms is the most expensive way to solve a rare problem. A generator wired to charge the bank covers it for a fraction — so we size solar for normal and keep fuel for the exception.
Hybrid sources
Where a site has steady wind or a grid connection worth keeping, we can build the system to accept more than one input — solar first, other sources filling in, all managed by one inverter and charge controller setup.
Tilt, aim & season
A summer-optimized array falls off badly in winter, which is exactly backwards for off-grid. On ground mounts we can set a steeper tilt to favor the short days, when you need every hour of production.
Shading is not negotiable
One branch across a string costs more than the math suggests. We map the winter sun path, not just the summer one — the low December sun finds obstructions that July never touches.
Efficient loads first
The cheapest kilowatt-hour is the one you never needed. Propane or heat-pump water heating, a mini-split instead of central air, LED lighting, and an efficient well pump can cut the system you have to buy substantially.
Monitoring that tells you something
State of charge, production, and consumption where you can see them daily. Off-grid living is much easier when you can tell a cloudy week from a failing component.
Keeping it healthy
Low maintenance, not no maintenance
There are no moving parts in a panel, but an off-grid system is doing more work than a grid-tied one and has no utility to fall back on when something drifts. Rinse the array a couple of times a year — more in dusty East County and after fire season. Check terminals and connections annually. Water and equalize flooded batteries on schedule. Watch the monitoring, and treat a slow decline in production as information, not background noise.
Worth knowing: the array will likely outlive its battery bank by a decade. We plan for that replacement at design time — accessible placement, right-sized wiring, and a bank you can swap without rebuilding the whole system.
More than a panel crew
Off-grid work is half electrical and half construction: footings, racking, trenching, equipment sheds, and sometimes the building itself. We hold the general building classification along with framing and structural carpentry, so the pad, the structure, and the array are one project.
Building new on raw land? Bring us in early. Running conduit and planning the electrical room before the walls close is far cheaper than retrofitting a finished house.
Common questions
What people ask before they commit
How long will it last?
Panels typically carry 20 to 25 year performance warranties. Inverters and charge controllers run 10 to 15 years. Batteries are the short straw — lithium commonly 10 to 15, lead-acid closer to 5 to 8. Every warranty term goes in your proposal.
Do I still need a generator?
Most off-grid homes keep one. It is the cheapest way to cover a stretch of storms or a week of unusual usage, and having it lets us build a right-sized system instead of an oversized one.
Can I run air conditioning?
Yes, if it is designed in from the start. AC, electric water heating, well pumps, and electric ranges are what drive system size. A mini-split is dramatically easier to support off-grid than central air — we will show you the difference in kilowatt-hours and in dollars.
Cheaper than a utility line extension?
Frequently, on remote parcels. Extensions are quoted per foot and escalate quickly with distance and terrain. Get that number from the utility and we will put a complete system next to it so you are comparing real figures.
What about permits?
Off-grid systems still get permitted and inspected. We pull county permits, handle inspections, and coordinate with your building permit if the house is going up at the same time.
Can it be expanded later?
If it is designed to be. Tell us at the walkthrough that a shop, a well, or an EV is coming and we will size the racking, conduit, and equipment so adding capacity is an addition — not a rebuild.
Equipment & workmanship
What we build with
Off-grid is the wrong place to save money on components — there is no utility to cover for a failure, and service calls to remote parcels are not quick. Tier-one modules, inverters and charge controllers from manufacturers with real support, and code-listed racking on footings we pour ourselves. Every part is named in the proposal with its warranty term.
RVs, trailers & camp setups
We do build small off-grid systems for RVs, trailers, and base camps — panels, a compact battery bank, and an inverter sized for the loads you actually carry. It is the same design exercise at a smaller scale, and the same rule applies: audit the loads first.
Tell us the rig and what you need to run and we will tell you what it takes.
Ask about a small systemWhere we build off-grid
Backcountry, desert, and mountain
Based in Chula Vista, and most of our off-grid work is out where the pavement ends — East County and the backcountry, the desert edge, and up in Big Bear, where short winter days and snow load both shape the design. We also build battery and backup systems on grid-connected homes across the county. If you are not sure whether your parcel is in range, call and describe it.
East County & backcountry
Alpine · El Cajon · Santee · Lakeside · Ramona · Julian · Descanso · Jamul · Campo
Mountain
Big Bear · Big Bear Lake · Sugarloaf · Fawnskin
North County
Escondido · San Marcos · Valley Center · Fallbrook · Vista · Carlsbad · Oceanside
South Bay & city
Chula Vista · Bonita · Jamul · San Diego · Poway · La Mesa · Lemon Grove
Get a free design & quote
Start with what you need to run
Describe the property and the loads — a cabin with lights and a fridge, or a full house with a well pump and air conditioning. We walk the site, study the sun, and come back with an array size, a battery bank, and one price for a working system.
Have a utility line-extension quote? Send it. We will put a complete off-grid system beside it so you can compare like for like.