For homeowners
Your panel is the bottleneck when you add an EV charger, solar, or a heat pump. We size the service so everything runs at once.
- Breakers trip when AC runs
- Adding a 48 amp EV charger
- Planning solar and battery
200 to 400 Amp Service Upgrade Upland CA for heavy electrical loads
A 200 to 400 amp service upgrade Upland CA gives your home the amperage modern appliances, EV chargers, and solar arrays demand. We handle the load calculation, permit, meter main, and panel swap for houses in San Bernardino County that keep tripping breakers or planning a big electrical addition. If your 100 or 200 amp panel is maxed out, this is the fix.
Load calculationPermit filedPanel labeled- We measure firstClamp meter before any swap
- We torque to specEvery lug, every breaker
- We label circuitsPanel map before we leave
- We test the serviceVoltage and grounding verified
What is included in a 400 amp service upgrade
Every 200 to 400 amp service upgrade includes the load calculation, permit, panel, meter main, and testing. Here is what we cover and what we price separately if your service needs it.
Load calculation and permit
We measure your existing demand with a clamp meter and multimeter, size the new service to NEC 2020/2023, and file the city electrical permit. You get a written scope and a fixed price before we start.
400 amp panel and main breaker
We install a 400 amp panel from Square D, Eaton, or Siemens with a 400 amp main breaker. The bus bar is rated for the full load, and we leave spare spaces for an EV charger, solar backfeed, or future circuits.
Meter main and service mast
We replace the meter main and service mast when they are damaged or undersized. We coordinate the Southern California Edison disconnect and reconnect so the new meter base passes utility inspection.
AFCI, GFCI, and surge protection
We install AFCI and GFCI breakers where California Electrical Code requires them and add a whole-home surge protective device at the panel. Every circuit is labeled and tested before we call for inspection.
Testing and inspection
We verify voltage, amperage, and grounding with a voltage tester and circuit breaker finder, then meet the city inspector on site. You get the permit sign-off and a walkthrough of the new panel.
Homes and businesses.
The approach is the same for a home and a business. What changes is the access, the schedule and who needs the paperwork.
For property managers
Multi-unit buildings and shared meter mains need capacity for each tenant. We size the service and install subpanels to match.
- Fourplex with shared meter main
- Tenants adding EV chargers
- Building panel fails inspection
What a 200 to 400 amp service upgrade Upland CA involves
A plain-language look at what 200 to 400 Amp Service Upgrade involves and when it is needed.
See how it worksA 200 to 400 amp service upgrade Upland CA replaces your existing service panel, meter main, and often the service mast with higher-capacity equipment rated for 400 amps. We pull a city electrical permit, coordinate with Southern California Edison for the meter disconnect, and install a new panel with a 400 amp main breaker, copper or aluminum feeders sized to NEC 2020/2023, and branch circuits protected by AFCI and GFCI breakers where code requires. Most jobs take one to three days on site.
Upland homes built in the 1960s through 1980s often have 100 amp service that cannot keep up with a heat pump, EV charger, and electric range running at once. If your breakers trip when the dryer and microwave run together, or you are adding a 48 amp EV charger and rooftop solar, a heavy duty electrical service upgrade Upland CA is the right call. We see this constantly in The Colonies and Historic Downtown Upland, where older service masts and Zinsco or Federal Pacific panels are still in service.
A 400 amp service gives your home the capacity to run everything at once.
- What it is
- Replacing a 100 or 200 amp panel with a 400 amp service, meter main, and new breakers.
- When you need it
- When breakers trip, you add an EV charger or solar, or your panel is Federal Pacific or Zinsco.
- What to expect
- A load calculation, permit, one to three days on site, and a city inspection.
How our 400 amp upgrade process works
We handle the load calculation, permit, utility coordination, and installation. You get a clear schedule and a panel that passes inspection.
-
Load calculation
We start with a full electrical load calculation using a clamp meter and multimeter to measure your existing demand. We check the service mast, meter main, and branch circuits, then size the new 400 amp service to NEC 2020/2023. You get a written scope and a fixed price before we pull the permit.
- Measure demand
- Check mast
- Size service
-
Permit and utility
We file the city electrical permit with Upland and schedule the meter disconnect with Southern California Edison. This usually takes three to seven business days. You do not have to call the utility or stand in line at the building department. We handle the paperwork and keep you posted on the schedule.
- File permit
- Schedule utility
- Confirm date
-
Panel and meter swap
On install day we disconnect the old service, remove the Zinsco or Federal Pacific panel, and mount the new 400 amp panel, meter main, and service mast. We pull new copper feeders, torque every lug with a torque screwdriver, and label each breaker. Most swaps take six to ten hours.
- Swap panel
- New meter main
- Pull feeders
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Circuit and testing
We reconnect branch circuits, install AFCI and GFCI breakers where required, and add a whole-home surge protective device. Every circuit gets tested with a voltage tester and circuit breaker finder. We verify voltage, amperage, and grounding before we call for inspection.
- Install breakers
- Test circuits
- Label panel
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Inspection and walkthrough
The city inspector signs off, then we walk you through the new panel. We show you which breakers control which rooms, how to reset the main, and where the surge protector sits. You get the permit sign-off and a labeled panel before we leave.
- Meet inspector
- Walkthrough
- Hand off paperwork
Tools and methods we use on every upgrade
Move across a circle, or focus it and press Enter, for an illustrative thermal view of the photograph.
Clamp meter and multimeter
We measure existing demand and verify voltage and amperage on the new service before we call for inspection.
Torque screwdriver
We torque every lug and breaker terminal to the manufacturer's spec, which prevents loose connections and overheating.
Circuit breaker finder and voltage tester
We map every branch circuit and confirm power is off before we work, then label each breaker correctly.
Fish tape and conduit bender
We pull new copper feeders through conduit and bend conduit for the service mast and meter main runs.
Insulated gloves and cable cutters
We work safely around live equipment and cut heavy feeders cleanly for a proper termination.
Thermal views are illustrative, generated from the photographs.
Methods
Square D, Eaton, and Siemens panels
We install these brands because they have available 400 amp main breakers and reliable AFCI and GFCI options.
NEC 2020/2023 load calculation
We calculate the existing and planned load per NEC 2020/2023 before sizing the service. This tells us whether 200 amps is enough or you need a 400 amp panel for EV, solar, and all-electric appliances.
California Electrical Code compliance
We follow California Electrical Code for AFCI and GFCI protection, grounding, and Title 24 energy standards. Every panel we install meets the code the Upland inspector checks.
Utility coordination with Southern California Edison
We schedule the meter disconnect and reconnect with Southern California Edison, so the power is off only for the time we need to swap the meter main and panel.
Torque-to-spec terminations
We use a torque screwdriver on every lug and breaker terminal. Loose terminations are a common cause of panel failure, and torquing to spec prevents callbacks.
Circuit labeling and documentation
We label every breaker and provide the load calculation and permit paperwork. You get a panel that is easy to service and a record of the upgrade for insurance or resale.
When Upland homeowners need 400 amp service
EV and solar
A homeowner in The Colonies adds a 48 amp EV charger and a 10 kW solar array to a house with 100 amp service.
We run a load calculation, pull the Upland permit, and install a 400 amp panel with a dedicated EV circuit and a solar backfeed breaker. We coordinate the Edison disconnect and install a whole-home surge protector.
Outcome: The homeowner charges the EV overnight and runs the house on solar during the day without tripping the main.
Federal Pacific swap
A 1960s ranch in Historic Downtown Upland still has a Federal Pacific panel and aluminum wiring.
We replace the Federal Pacific panel with a 400 amp Square D service, install AFCI and GFCI breakers, and repair the aluminum wiring connections. We file the permit and meet the inspector.
Outcome: The house passes inspection, the insurance red flag is cleared, and the panel is labeled for future work.
Fourplex capacity
A property manager in North Upland needs more capacity for a fourplex with electric ranges and heat pumps.
We size a 400 amp service for the building, replace the meter main and service mast, and install subpanels for each unit. We schedule the work around tenants and keep the power off for only a few hours.
Outcome: All four units have dedicated capacity, the building passes inspection, and the tenants keep their power.
ADU and pool
A homeowner in San Antonio Heights plans an ADU and a pool, but the existing 200 amp panel has no spare spaces.
We upgrade to a 400 amp service, add a subpanel for the ADU and pool equipment, and install GFCI breakers for the pool circuits. We run the load calculation to size the feeders.
Outcome: The ADU and pool have dedicated circuits, and the main panel still has room for future additions.
Battery backup
A homeowner in Upland Hills wants battery backup and a heat pump but the 200 amp service is maxed out.
We install a 400 amp panel with a critical-load subpanel for the battery backup, dedicated circuits for the heat pump, and a surge protective device. We handle the permit and utility coordination.
Outcome: The heat pump and battery backup run without derating, and the homeowner has capacity for future electrification.
How 400 amp upgrades work in Upland
Upland's housing stock ranges from 1920s bungalows near Historic Downtown to 1980s tract homes in The Colonies and larger properties in San Antonio Heights. Many of these homes still have 100 amp service, aluminum wiring, or a Federal Pacific or Zinsco panel that cannot pass inspection.
The city requires an electrical permit for any service upgrade, and Southern California Edison requires a disconnect and reconnect for the meter. We handle both. Summer heat pushes demand higher, and more homeowners are adding EV chargers, solar, and heat pumps, which is why we see so many requests for a 400 amp electrical service near me Upland.
If you are planning a 400 amp service upgrade for large home Upland, California projects, we size the feeders and bus bar for the full load, not just today's appliances.
- Historic Downtown Upland: Older homes with 100 amp service, fuse boxes, and aluminum wiring. We replace the service and bring the panel up to California Electrical Code.
- The Colonies: 1980s and 1990s tract homes with 200 amp panels that are maxed out when owners add EV chargers and solar. We upgrade to 400 amps and add dedicated circuits.
- San Antonio Heights: Larger lots with pools, ADUs, and well pumps. These properties often need a 400 amp service and subpanels to handle the extra load.
- North Upland: Multi-unit properties and fourplexes with shared meter mains. We size the service for each unit and install subpanels.
- Summer temperatures above 100 degrees: AC and heat pump demand peaks in July and August, which is when undersized panels trip most often. A 400 amp service handles the peak without nuisance tripping.
- Older service masts and meter mains: Many Upland homes have masts that fail utility inspection. We replace the mast and meter main as part of the upgrade so the reconnect passes.
We walk the panel and service mast with you. We protect floors and set up the work area. We test the new service and explain the panel.
From problem to finished result.
100 amp panel to 400 amp service
Before: A 1970s home in The Colonies had a 100 amp panel with no spare spaces. The owner added a 48 amp EV charger and the main tripped every time the AC and charger ran together. The panel was a Federal Pacific with known failure modes.
After: We installed a 400 amp Square D panel with a new meter main, a dedicated 48 amp EV circuit, and AFCI and GFCI breakers. The home now runs the AC, EV charger, and dryer at the same time without tripping. The inspection passed the first time.
We recommend an annual panel check and keeping the area around the panel clear. Test the AFCI and GFCI breakers monthly using the test button.
Fuse box to 400 amp breaker panel
Before: A 1920s bungalow near Historic Downtown Upland still had a fuse box and aluminum wiring. The insurance company flagged the panel and required replacement. The service mast was damaged and failed utility inspection.
After: We replaced the fuse box with a 400 amp breaker panel, repaired the aluminum wiring connections, and installed a new service mast and meter main. The home passed inspection and the insurance policy was renewed.
Keep the panel labeled and have the aluminum connections checked every few years. We provide the permit paperwork for your records.
200 amp panel to 400 amp for solar
Before: A homeowner in San Antonio Heights wanted a 10 kW solar array and battery backup but the 200 amp panel had no capacity for the backfeed. The load calculation showed the service was already near its limit with the pool pump and heat pump.
After: We upgraded to a 400 amp service with a dedicated solar backfeed breaker and a critical-load subpanel for the battery. The solar array and battery backup now run without derating, and the pool and heat pump have dedicated circuits.
Monitor the solar production and battery status through the app. We recommend a panel inspection every two years as the system ages.
Problems a heavy duty electrical service upgrade solves
An undersized or failed panel causes tripped breakers, failed inspections, and insurance problems. Here is what we fix.
- Nuisance trippingBreakers trip when major appliances run togetherYou cannot run the AC, dryer, and microwave at the same time. The constant tripping stresses motors and electronics, and it signals the service is undersized. We run a load calculation, then install a 400 amp panel with dedicated circuits for the EV charger, range, and HVAC. You get enough capacity to run everything at once without nuisance tripping.
- Federal Pacific failureFederal Pacific or Zinsco panel failureThese panels have known failure modes and can void homeowner insurance. Some insurers will not renew a policy until the panel is replaced. We replace the Federal Pacific or Zinsco panel with a Square D or Eaton 400 amp service, install AFCI and GFCI breakers, and provide the permit paperwork your insurer needs.
- No EV capacityNo capacity for an EV charger or solarA 100 amp service cannot support a 48 amp Level 2 charger plus a 10 kW solar array. Adding either one without upgrading the service leads to derating, tripped breakers, or a failed inspection. We size the 400 amp service for EV and solar from the start, leaving dedicated breaker spaces and a bus bar rated for the backfeed. You can add both without another service change.
- Damaged meter mainDamaged service mast or failed meter mainA damaged mast or failed meter main can stop an upgrade and leave you without power. It also fails utility inspection, which delays the reconnect. We replace the service mast and meter main as part of the upgrade, coordinate the Southern California Edison disconnect, and install a new meter base rated for 400 amps.
Why Upland homeowners upgrade to 400 amp service
More capacity means no tripped breakers and room for EV, solar, and heat pumps.
Room for EV and solar
A 400 amp panel supports a 48 amp Level 2 EV charger plus a 10 kW solar array and battery backup without derating. You can charge overnight and run the house on solar during peak hours. We size the bus bar and feeders so you are not maxed out the day the system goes live.
No more nuisance tripping
If your 100 amp panel trips when the AC, dryer, and microwave run together, the service is undersized. A 400 amp upgrade Upland, California eliminates that bottleneck. You get a dedicated 240V circuit for the EV, a 50 amp range circuit, and spare breaker spaces for future additions.
Code-correct and insurable
Federal Pacific and Zinsco panels have known failure modes and can void homeowner insurance. Replacing them with a Square D or Eaton 400 amp panel brings the service up to California Electrical Code and clears the red flag. We install AFCI and GFCI breakers, surge protective devices, and label every circuit.
Higher resale value
A 400 amp service is a selling point in Upland's market. Buyers with EVs or plans for a pool house or ADU see a panel that already has capacity. We provide the load calculation and permit paperwork so the upgrade is documented when you list the home.
What a written scope covers.
What a written scope covers and what shapes it. Prices are set by the business after the first look.
Included
- Load calculation and written scope
- City electrical permit filing
- 400 amp panel and main breaker
- Meter main and service mast
- AFCI, GFCI, and surge protection
- Testing, labeling, and inspection
Depends on
- Feeder length and routing
- Meter main condition
- Service mast condition
- Aluminum wiring repairs
- Subpanel additions
- Utility disconnect timing
What you receive
Clear records you can keep and share.
Load calc
Written demand calculation
Panel map
Labeled breaker schedule
Permit copy
City sign-off paperwork
Photo log
Before and after panel photos
200 amp vs 400 amp service
The right size depends on your calculated load and what you plan to add.
200 amp service
Enough for most homes without EV or solar
- Single AC and range
- No EV charger
- Limited spare spaces
400 amp service
Capacity for EV, solar, and all-electric appliances
- 48 amp EV charger
- 10 kW solar array
- Heat pump and battery
Subpanel add-on
Dedicated panel for ADU, pool, or garage
- Separate breaker space
- Fed from main service
- GFCI for pool circuits
What we work with
- Square D
- Eaton
- Siemens
- Copper wire
- Conduit
- AFCI breakers
- GFCI breakers
- Surge devices
Service ZIP codes.
A list like this tells people straight away whether you cover their street. Not listed? Call and ask: it only takes a minute.
- 91784
- 91786
- 91785
Towns we serve.
Based in Upland and covering the places around it. Pick one for local details.
- Historic Downtown Upland
- The Colonies
- Upland Hills
- San Antonio Heights
- College Heights
- Los Olivos
- McCarthy Park
- Magnolia Park
- North Upland
- Upland Palms
- Claremont
- Rancho Cucamonga
What Upland homeowners say
Frequently asked questions about 400 amp service upgrades
You need one when your existing 100 or 200 amp panel cannot carry the load. Signs include breakers tripping when the AC, dryer, and microwave run together, a Federal Pacific or Zinsco panel, or plans to add a 48 amp EV charger, solar, a heat pump, or an ADU. A load calculation confirms it. If your calculated demand exceeds 200 amps, we size the service to 400.
A 400 amp service upgrade for large home Upland, California projects with long runs or a new mast lands at the higher end. You get a fixed price after the load calculation.
Yes. A 400 amp panel gives you enough capacity for a 48 amp Level 2 EV charger, a 10 kW solar array, and battery backup without derating the main. We size the bus bar and feeders so the solar backfeed breaker and EV circuit have dedicated spaces. We also install a whole-home surge protective device to protect the electronics.
Yes. The city of Upland requires an electrical permit for any service upgrade, and Southern California Edison requires a disconnect and reconnect for the meter. We file the permit, schedule the utility, and meet the inspector on site. The permit also documents the upgrade for insurance and resale, which matters when you sell the house.
Other electrical panel services we offer
Other services from the same team.
- Subpanel InstallationA subpanel in the garage or at the back of the house shortens circuit runs and clears space in a crowded main panel. We feed it with correctly sized copper, install a separate neutral and ground bar, and label every breaker so the next electrician can read it.
- Fuse Box to Breaker Panel ConversionOld fuse boxes in Historic Downtown Upland homes cannot take AFCI or GFCI protection and often have no main disconnect. We pull the old box, install a modern breaker panel, and re-circuit the house with new breakers and labeled runs. Most conversions finish in one day.
- Outdated Panel ReplacementFederal Pacific and Zinsco panels are known failure points, and insurance carriers in Upland increasingly ask about them. We replace the panel, inspect the branch wiring for heat damage, and correct aluminum wiring issues at the terminations with proper connectors.
Schedule your 200 to 400 amp service upgrade Upland CA
Call (909) 850-3163 for a load calculation and fixed price on your 400 amp service upgrade. We pull the permit, coordinate Southern California Edison, and install the panel. Most Upland jobs are scheduled within a week.
Talk to a Panel Tech
Call or email with your address and what the panel is doing, and we will tell you what the job likely involves. We answer calls Monday through Friday, 8am to 6pm, and return messages from Upland, Rancho Cucamonga, and Ontario the same business day. For dead panels and burning smells, say so on the call.