Licensed C-10 Electrical Contractor #989290 · Novato, CA (415) 419-5960

Residential Electrical Services · Pillar Guide

Solar electrical, done by the same crew that builds the rest of your home.

Name: Towery Electric
Address: 46 Digital Dr #1, Novato, CA, 94949, US
Telephone: (415) 419-5960

The electrical side of a solar install — service-side coordination, inverter wiring, battery readiness, and the panel work that solar contractors often hand back to a real C-10.

Written bySteven Lockhart

Reviewed byAlex Towery · C-10 #989290

Updated: June 2026 · Read: 7 min

11 yrsMarin electrical work

C-10CSLB licensed contractor

1st passInspection rate

48 hrTypical estimate turnaround

Key Takeaways

Solar projects involve three trades: solar (panels), electrical (service, inverter, battery), and PG&E (interconnection). A single coordinated contractor keeps the timeline tight.
'Solar-ready' panel work done during a panel upgrade costs a fraction of retrofitting solar capacity later.
Battery storage (Powerwall, Enphase IQ Battery, FranklinWH) is increasingly the high-value piece — and it's where electrical work concentrates.
NEM 3.0 changed export economics; modern Marin solar designs prioritize self-consumption and storage over export.
The biggest preventable issue is mismatched scope between solar installer and electrical contractor — get one team or coordinate explicitly.

Towery Electric — Solar-Ready Electrical.

01 — OverviewWhat Solar-Ready Electrical actually covers in Marin.

Solar electrical work has shifted dramatically since NEM 3.0 reduced export compensation. Modern Marin installs prioritize self-consumption — more solar paired with battery storage, smart load management, and panel work that supports both. The electrical contractor scope has grown as a result.

The most common pain point is fragmented responsibility. A solar installer puts panels on the roof and connects an inverter, then hands the homeowner a list of 'electrical work to be done by others.' Towery handles the full electrical scope from panel upgrade through battery integration, alongside or after the solar contractor.

Definition

Solar electrical work covers the AC side of a residential solar installation — main panel coordination, sub-panel additions, inverter circuit, battery system integration, and PG&E interconnection coordination.

Solar-ready panel work

When upgrading a panel, designing it solar-ready saves significant future cost. Solar-ready means adequate amperage headroom, a dedicated solar disconnect location, and either a backup-loads sub-panel or critical-load isolation support. Adding during a planned upgrade adds $400-$900; retrofitting later costs $3,000+.

Battery integration

Adding a battery (Powerwall, Enphase IQ Battery, FranklinWH) requires careful design: backup-load sub-panel, gateway placement, transfer-switch logic. This is where C-10 scope becomes substantial and where the right contractor saves months of follow-up.

For the broader context this guide supports, see our Residential Electrical Services overview.

Explore the Full Guide

Solar electrical scope clusters around three areas: panel/service work, battery systems, and PG&E coordination.

Three guides to read first

Cornerstone

Solar-Ready Electrical Work in Marin

Designing a panel that can accept solar without rework. The panel-upgrade-plus-solar architecture.

Explore the guide →

Battery

Powerwall vs Enphase IQ Battery

The two leading residential batteries — install cost, capacity, electrical considerations, warranty.

Explore → Coordination

Coordinating Solar Installer + Electrical Contractor

Who does what, who pulls which permits, and how to avoid the fragmented-responsibility trap.

Explore →

Browse the Full Library

Panel & service work

Battery systems

Integration & PG&E

PSPS resilience

02Solar electrical cost in Marin.

The C-10 portion only — not including solar contractor's panel/mounting work.

Inverter circuit + simple interconnection ($1,200-$2,400)

AC circuit from inverter to main panel, dedicated breaker, AC disconnect.

Main panel upgrade for solar ($4,800-$8,500)

Existing panel can't support solar back-feed; full panel replacement first.

Battery integration (per battery, $3,800-$6,500)

Gateway, backup-loads sub-panel, transfer-switch logic, commissioning.

Full solar-ready upgrade ($6,800-$11,500)

Panel upgrade + sub-panel + solar disconnect + battery readiness — one coordinated project.

03Why NEM 3.0 changed Marin solar design.

California's NEM 3.0 (April 2023) dramatically reduced compensation for exported electricity. Economic logic shifted from 'produce a lot, export the surplus' to 'produce, store, and self-consume.'

Self-consumption focus

Modern designs size the array for actual home consumption, not maximum roof coverage. Excess production is stored, not exported.

Battery becomes the high-value piece

Battery storage has shifted from luxury add-on to core value proposition. Solar without battery makes much less economic sense under NEM 3.0.

04Coordinating with your solar installer.

The fragmented-responsibility trap is the most common preventable issue in residential solar.

The Problem

Homeowner signs with a solar company that handles 'everything.' Panels go on the roof, inverter mounted, homeowner gets a list: 'Electrical work to be completed by others: panel upgrade required, sub-panel for backup, gateway commissioning, PG&E interconnection paperwork.'

The Solution

Either use a solar contractor with fully-staffed C-10 electrical in-house, or coordinate explicitly: define electrical scope in writing before solar starts, with the electrical contractor on the same coordination timeline.

The Resolution

With clear scope on both sides, the project runs 6-10 weeks from contract to closed PG&E interconnection. Without it, the same project can drag to 6+ months.

05Choosing a solar electrical contractor.

Look for C-10 contractors with specific solar+battery experience and current factory certifications.

Battery manufacturer certification

Powerwall, Enphase, FranklinWH certify electrical contractors separately. Verify before signing.

PG&E interconnection familiarity

PG&E's interconnection process is involved. Contractors who do this frequently navigate it cleanly.

Frequently Asked Questions

Do I need a separate electrician for my solar install?

Depends on your solar contractor's scope. Some handle everything in-house including electrical and permits. Others handle only panels and mounting, and hand off electrical (panel upgrades, sub-panels, battery integration, PG&E paperwork) to a C-10. Both models work; know which model your installer uses before signing. Towery handles the electrical scope alongside or after solar contractors regularly.

What does the electrical portion of solar typically cost?

For C-10 work alone (not solar contractor's panels/mounting): $1,200-$11,500 depending on scope. Simple cases — existing panel has capacity — $1,200-$2,400. Panel upgrade $4,800-$8,500. Battery integration $3,800-$6,500 per battery. Comprehensive solar-ready upgrade $6,800-$11,500. We quote specific scope after seeing panel, roof plan, battery selection.

Should I add a battery with my solar install?

In Marin in 2026, for most homeowners yes — NEM 3.0 dramatically reduced grid-export value, so storage-driven self-consumption is now the core economic case. Battery sizing depends on consumption, PSPS exposure, budget. Single Powerwall (13.5 kWh) covers most evening essentials. Two Powerwalls cover whole-home for 24-hour outages. Estates often install 3+ for multi-day resilience.

How long does a solar+battery install take?

For a typical Marin single-family home with panel upgrade, solar array, and one battery, expect 6-10 weeks from contract to PG&E permission-to-operate. Permit issuance (1-3 weeks), panel upgrade (1-2 weeks), solar mount/connect (2-3 weeks), battery (1 week), PG&E interconnection paperwork (2-4 weeks — often longest). On-site labor totals 3-5 working days.

Will my solar system work during a PSPS event?

Depends on battery + backup-loads sub-panel. Solar without battery does NOT work during grid outage — inverter is required by code to disconnect to protect line workers. Solar WITH battery and proper backup architecture continues to power your home during outages and recharges from solar during the day. This is the biggest reason we recommend battery storage for Marin solar installs.

Do I need to upgrade my panel before installing solar?

Sometimes. The determining factor is whether your existing panel has the bus-bar rating to accept solar back-feed. Per NEC, solar input plus main breaker can't exceed 120% of bus rating in most cases. For a 200-amp panel with 200-amp main, max solar input is ~40 amps — works for most residential arrays. For larger arrays or panels at bus limit, panel upgrade is required first. We calculate this on every quote.

How We Reviewed This Page

Reviewed against current California Electrical Code (Title 24, Part 3) and 2023 NFPA 70 (NEC) provisions applicable to the topic.
Pricing ranges reflect actual 2026 Towery Electric quote data from Marin County jobs — not third-party industry averages.
Permit and inspection timing reflects current AHJ practice in Novato, San Rafael, Mill Valley, and unincorporated Marin County as of mid-2026.
Technical review by Alex Towery, founder and C-10 #989290 holder, with 11+ years of California electrical work.
All factual claims about code requirements were verified against primary sources (CSLB, CARB, PG&E, AHJ) at time of publication.

References

This guide reflects Towery Electric's professional standards as a California-licensed C-10 electrical contractor and is for general information. Site conditions, panel configurations, code amendments, and permit-authority requirements vary; final scoping, sizing, and code compliance for your specific address are determined on a paid site assessment. We follow California Electrical Code (Title 24, Part 3) and applicable NFPA 70 (NEC) editions adopted by your AHJ.

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