Designing Solar Battery Backup Systems
A DIY Guide to 12, 24, and 48 Volt Inverters, Panels, and Wiring for HomesBy Duane Whitlock
Length12h 31m
About this audiobook
A backup system either carries your loads through the outage or it does not, and the difference is arithmetic you can do yourself.
This guide walks you through that arithmetic step by step, from the first load audit to the final commissioning check. You will measure real appliance draw and build an honest watt-hour budget, size an array from peak sun hours, correct string voltage for the coldest morning of the year, and choose a maximum power point controller that matches it. No hand-waving, no rule-of-thumb shortcuts that fail in February.
You will compare lithium iron phosphate and lead-acid banks, size amp-hours to your runtime, decide between 12, 24 and 48 volt buses, select inverter continuous and surge ratings, and size conductors, fuses, disconnects and bonding correctly. Closing chapters cover the critical loads subpanel, transfer switching, permits, commissioning and fault finding. Written for capable homeowners, cabin and van builders, and new solar installers who want a system that works when the grid does not.
What you will learn:
• Four ways to build a backup system and how to choose the right architecture for your site
• How to run a load audit that measures real appliance draw and produces an honest watt-hour budget
• How to size a solar array from peak sun hours and correct string voltage for the coldest morning of the year
• How to select and configure a maximum power point charge controller that matches your array and bank
• How to compare lithium iron phosphate and lead-acid batteries and size amp-hours to your required runtime
• How to choose between 12, 24 and 48 volt buses and select inverter continuous and surge ratings
• How to size conductors, overcurrent protection, disconnects, grounding and bonding correctly
• How to connect to the house with a critical loads subpanel and transfer switching, including permits
• How to commission, monitor, maintain and troubleshoot the system once it is running
This book is for capable homeowners, cabin and van builders, and new solar installers who want a backup system that carries the loads that matter. If you can read a multimeter and follow a wiring diagram, you can build and maintain the system described here.
Audiobook details
Rating★★★★ 4.3 (17)
Includes Amazon
GenreTechnology
Length12 hrs 31 mins
Narrated byListen with 1,000+ voices
FormateBook with Audio
Publish dateSep 27, 2026
LanguageEnglish
Table of contents
1Foreword
2Preface
3About This Book
4Important Safety Notice
5Chapter 1: Four Ways to Build a Backup System
Show all chaptersShow less
61.1 What a Backup System Must Do
71.2 The DC-Coupled Off-Grid System
81.3 The AC-Coupled Retrofit
91.4 The Grid-Tied Hybrid
101.5 The Simple Critical-Loads Backup
111.6 Comparing the Four Architectures
12Chapter 2: The Load Audit
132.1 Why Nameplate Watts Lie
142.2 Measuring Real Draw
152.3 Duty Cycle and Coincidence
162.4 Surge and Locked-Rotor Demand
172.5 Building the Daily Watt-Hour Budget
182.6 Choosing What Stays On
19Chapter 3: Sun, Site and Array Sizing
203.1 Peak Sun Hours by Season
213.2 Tilt, Azimuth and Row Spacing
223.3 Shading, Soiling and Mismatch Losses
233.4 Deriving Array Watts from the Energy Budget
243.5 Checking the Sizing Against Reality
25Chapter 4: Solar Modules and String Design
264.1 Reading the Current-Voltage Curve
274.2 Temperature Coefficients
284.3 Cold-Weather Open Circuit Voltage Correction
294.4 Series Strings and Parallel Sets
304.5 Mismatch, Bypass Diodes and Module Choice
31Chapter 5: Charge Controllers
325.1 Maximum Power Point Tracking Versus Pulse-Width Modulation
335.2 Input Voltage and Current Limits
345.3 Sizing the Controller to the Array
355.4 Charge Stages and Settings by Chemistry
365.5 Temperature Compensation and Remote Sensors
37Chapter 6: Batteries and Bank Sizing
386.1 Lithium Iron Phosphate Versus Absorbed Glass Mat
396.2 Depth of Discharge and Cycle Life
406.3 Charge and Discharge Rate Limits
416.4 Amp-Hour and Kilowatt-Hour Sizing
426.5 Rack-Mount Packs and Bank Architecture
43Chapter 7: Battery Management and Communication
447.1 Cell Balancing and Why It Matters
457.2 Protection Thresholds
467.3 Low-Temperature Charge Cutoff
477.4 Closed-Loop Control Between Battery and Inverter
487.5 State of Charge Accuracy
49Chapter 8: Choosing 12, 24 or 48 Volts and Selecting an Inverter
508.1 Current Versus Voltage Trade-Offs
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