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ACS Learn · A Homeowner's Field Guide

Solar, batteries & HVAC — explained.

New to all this? Start here. We've spent 40+ years answering homeowner questions across Southern California — now organized into plain-English lessons. Learn what solar actually is, how a home battery works, and what it all means for your bill, before anyone tries to sell you anything.

Start with the basics Estimate My Savings
What's Inside The ACS Field Guide
  1. 01 What is solar? The basics
  2. 02 What is a home battery? The basics
  3. 03 What is HVAC & heat pumps? The basics
  4. 04 EV charging on solar The basics
  5. 05 Panels, inverters & your roof The basics
  6. 06 California rules: NEM 3.0 & rates Go deeper
  7. 07 Tax credits & financing Go deeper
  8. 08 Solar 101: common questions FAQ
Free Downloadable Guides

Get the guide before you get quotes

Independent, no-nonsense buyer's guides written by the ACS team. Tell us where to send it and it's yours — free, no obligation.

ACS Ultimate Solar Guide cover

Ultimate Solar Guide

Choosing a qualified installer is the most important decision you'll make. This free guide walks you through what to look for as you begin your research into going solar.

ACS Battery Buyer's Guide cover

Battery Buyer's Guide

Home battery storage is still new, and it's easy to get confused comparing options. Learn how to tell products apart and choose the right backup for your home.

ACS HVAC Buyer's Guide cover

HVAC Buyer's Guide

Your HVAC is usually your home's biggest energy user. This guide helps you avoid common mistakes and pick an efficient system that pairs with your solar.

The Basics

Start with the fundamentals

Before the quotes and the spec sheets, here's what each piece actually is — in plain English, no jargon.

Lesson 01 · Solar

What is solar — and how does it work?

Solar panels turn sunlight into electricity your home can use. No moving parts, no fuel, no noise — just free power from the sun every day it's up.

The short version: sunlight hits the panels on your roof and creates direct current (DC) electricity. An inverter converts that into the alternating current (AC) your home runs on. Your house uses what it needs in real time, and anything extra flows to your battery or back to the grid.

  • Panels make the most power midday, when the sun is highest
  • An inverter turns solar DC into home-ready AC power
  • Your home uses solar first, then pulls from battery or grid
  • In SoCal sunshine, a typical roof can cover most of a year's usage
Explore residential solar Read: How to buy solar
Lesson 02 · Battery Storage

What is a home battery?

A home battery stores the solar power you make during the day so you can use it at night, during peak-rate hours, or when the grid goes down.

Solar only makes power while the sun is out — but in California your highest electricity rates hit from 4–9 p.m., long after production drops. A battery bridges that gap: it fills up on cheap daytime solar, powers your home through the expensive evening, and keeps your lights on during an outage.

  • Backup power that kicks in automatically during outages
  • Store cheap daytime solar, spend it during 4–9 p.m. peak rates
  • Essential under NEM 3.0, where exporting to the grid pays little
  • Stack multiple units for more capacity and whole-home backup
Explore battery storage Read: How to buy a battery
Lesson 03 · Heating & Cooling

What is HVAC — and why pair it with solar?

HVAC is your home's heating, ventilation and air conditioning — usually the single biggest user of electricity in a Southern California home.

A modern heat pump both heats and cools using electricity instead of gas, running far more efficiently than an older AC-and-furnace setup. Because it's such a big load, pairing efficient HVAC with solar is one of the fastest ways to cut your bill — you're running your biggest appliance on sunlight.

  • One heat pump both heats and cools your whole home
  • Far more efficient than older AC + gas furnace systems
  • Your biggest electric load — ideal to run on solar
  • Rated by SEER2 for cooling and HSPF2 for heating efficiency
Explore HVAC Read: How to buy HVAC
Lesson 04 · EV Charging

What is EV charging on solar?

A home EV charger refuels your car in your own driveway — and when it runs on solar, those miles come from your roof instead of the gas station or the grid.

A Level 2 charger adds roughly 25–35 miles of range per hour, so most drivers plug in overnight and wake up full. Pair it with solar and a battery and you can schedule charging for the middle of the day on your own power, sidestepping California's expensive 4–9 p.m. peak rates entirely.

  • A Level 2 charger is 5–7× faster than a standard wall outlet
  • Charge on daytime solar and skip peak-rate grid power
  • Size your solar a little larger to cover the added driving load
  • Smart chargers let you time charging and track energy use from your phone
Ask about EV charging Read: How to buy a battery
Lesson 05 · The Equipment

Panels, inverters & your roof — the parts explained

A solar system is really just a few parts working together. Knowing what each one does makes every quote easier to read — and every salesperson easier to question.

Panels capture sunlight, an inverter turns it into usable power, mounting hardware anchors it all to your roof, and monitoring shows you what the system is doing in real time. The quality and warranty of each part matters more than the brand names on the brochure.

  • Panels: higher-efficiency models make more power from the same roof space
  • Inverters: string vs. microinverters change cost, shade tolerance and monitoring
  • Your roof: age, pitch and direction shape layout and output — south-facing wins
  • Warranties: look for ~25 years on panels and workmanship you can count on
Explore residential solar Read: How to buy solar
The Buyer's Guides

Ready to go deeper? Step-by-step guides to buying right

Complete, start-to-finish walkthroughs for each big decision — what to look for, what to ask, and the red flags to avoid.

Guide

How to Buy Solar

The seven steps from reading your bill to flipping the switch — sizing, cash vs loan vs PPA, vetting an installer, permitting and what to expect after install.

Read the guide
Guide

How to Buy a Home Battery

Backup vs bill-savings goals, sizing capacity (kWh) and power (kW), whole-home vs essential backup, comparing equipment, and retrofit vs new.

Read the guide
Guide

How to Buy or Replace HVAC

When to replace, right-sizing with a Manual J, SEER2/HSPF2 efficiency, heat pump vs AC + furnace, and pairing your biggest load with solar.

Read the guide
Go Deeper · Savings & Financing

The numbers behind the decision

Savings

How much can you really save?

Estimate your real payback period and lifetime savings against rising SoCal utility rates before you commit.

Read article
Financing

$0 down, PPA, or cash?

Every path to solar has trade-offs. Compare loans, prepaid PPAs and cash so you pick the option that fits your budget and goals.

Read article
Battery

Do you need a battery?

When storage is worth it, how it keeps your lights on during outages, and how it dodges expensive peak rates.

Read article
Go Deeper · California Rules & Incentives

How the state's rules affect your system

Net Metering

NEM 3.0, explained

California changed how solar exports are credited. What the Net Billing Tariff means — and why a battery now does the heavy lifting.

Read article
Rates

Beating time-of-use rates

Your bill spikes 4–9 p.m. for a reason. How solar plus storage flips that expensive evening window in your favor.

Read article
Incentives

The federal tax credit in 2026

Incentives shifted heading into 2026. A no-spin look at where things stand — and why how you pay for solar matters more than ever.

Read article
Solar 101

Common first questions

The questions almost every homeowner asks before they start — answered straight.

Yes. Panels run on daylight, not heat, so they still produce when it's overcast — just less. Over a full year, Southern California's long, sunny days more than make up for the cloudy ones.

Not on their own. For safety, a grid-tied solar system shuts off during an outage so it can't backfeed the lines. To keep your home powered when the grid is down, you need a battery to store and supply backup power.

It depends on your goals. Under California's NEM 3.0 rules, exporting extra solar to the grid pays very little — so a battery is what lets you actually use the power you make in the evening, and it's the only way to have backup during outages.

No catch, but understand the structure. With a loan or PPA you finance the system over time, and the monthly payment is often lower than the utility bill it replaces. We walk you through cash vs. loan vs. PPA so you can see the real numbers and pick what fits.

Quality panels are warrantied around 25 years and keep producing well beyond that. Home batteries typically carry a 10-year warranty. Both have no moving parts, so day-to-day upkeep is minimal.

See all FAQs
Tools & Answers

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Frequently Asked Questions →

Quick answers on cost, financing, maintenance, timelines and service areas.

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