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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 225

Tiny 2-cell solar panel charges batteries in compact, off-grid devices

Fran Hoffart

Abstract

A method of producing a compact battery charger that operates from a small 2-cell solar panel is described.

Keywords

Battery charger

solar panel

LTC3105 boost converter

LTC4071 shunt charger

Introduction

Advances in low power electronics now allow placement of battery-powered sensors and other devices in locations far from the power grid. Ideally, for true grid independence, the batteries should not need replacement, but instead be recharged using locally available renewable energy, such as solar power. This Design Note shows how to produce a compact battery charger that operates from a small 2-cell solar panel. A unique feature ...

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