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Generator Battery Charging – Quickly and Deeply

Generator Battery Charging - Quickly and Deeply

Quick and deep generator battery charging is totally possible. You must, however, know how to do it. This article reveals all. It explains why and how. The article is valid for both 120-volt and 240-volt generators.

All such generators have a 12-volt DC socket. Some generator makers label it ‘Battery Charger’. This socket, however, is intended to power small 12-volt devices, such as a TV directly. Its output is a typically unregulated 13.6-volts. It drops under load (to 12.6-volts or less). That voltage is, nevertheless, fine for running 12-volt lights and appliances.

Lead acid and AGM batteries

A generator's typically unregulated 13.6-volts is far too low for full and speedy battery charging. It may half-charge a flat 100 amp-hour lead-acid or AGM battery within six or so hours. From there on, charging progressively reduces. It may take further 24 hours to charge it over 70%. And a week or more more to fully charge it.

The solution is simple and effective. Charge the battery via a 240-volt (or 120-volt) battery charger powered by the generator's 240-volt (or 120-volt) outlet. The size charger required (and its safe charging rates) varies with battery capacity and types. This is particularly so for LiFePO4 batteries.

As a general guide, most lead type batteries below 180-200 amp-hour typically have a recommended maximum charging current of less than 40 amps. For these a 25-amp charger is adequate.

Charging Voltage

Recommended maximum charging voltages for most AGM or gel batteries are around 14.6 volts,but always check the manufacturer’s recommendation.

For lead-acid and AGM batteries once fully charged, to avoid overcharging and to extend battery life, the charger should drop to about 13.2-13.3 volts.

Charging in high temperatures

Battery maker charging recommendations usually for an ambient temperature of  250 C. Regardless of battery type, if charged in a high-ambient temperature environment, such as an engine bay, check the battery manufacturer’s related recommendations. Some batteries (particularly AGMs) are not suitable for engine bay installation. Some battery warranties are void if installed in engine bay temperatures.

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Want to find out more? Our books cover all these topics and a lot more. 

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Whether you’re buying your first RV or updating to a bigger, more comfortable rig, there are a great many things you need to know and consider. How to Choose and Buy an RV breaks things down so that you can decide what you want and whether or not what you’ve found is right for you.

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Cover of solar that really works by collyn riversSolar That Really Works! explains every detail of designing and installing solar in boats, camper trailers, caravans and motorhomes.

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Cover of caravan and motorhome electrics by collyn riversCaravan & Motorhome Electrics covers every aspect of designing, installing and fault finding of the electrics in fifth wheel and conventional caravans, camper trailers and motorhomes.

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Cover of the caravan and motorhome book by collyn riversThe Caravan & Motorhome Book covers every conceivable aspect of camper trailer, caravan and fifth wheel caravan, campervan and motorhome usage.

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Cover of why caravans roll over by collyn riversCaravans and their tow vehicles rarely jack-knife and roll over - but when they do the results are catastrophic. The cause, and how to prevent it, is explained here. Why Caravans Roll Over offers solid advice for keeping yourself safe on the road.
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Cover of solar success by collyn riversSolar Success explains how to design and build home and property systems that ensures affordable solar success first and every time.

 

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Between 1959 and 1961 Collyn Rivers and Antony Fleming drove a Bedford QLR off-road truck twice the length and breadth of Africa studying road surface conditions.

A 43 minute film about their adventure, produced and narrated by Antony Fleming, has been viewed on YouTube more than 1.6 million  times!

Picture from africa journey. Caravan and motorhome electrics by collyn rivers

To view the film, and also read Collyn's telling of the tale, just click the button below.

Africa 

Cover of how to choose and buy an rv by collyn riversWhether you're buying your first RV or updating to a bigger, more comfortable rig, there are a great many things you need to know and consider.  This book breaks things down so that you can decide what you want and whether or not what you've found is right for you. It's technically sound and comprehensive so that you can proceed with complete confidence.  How to Choose and Buy an RV is the ultimate guide for those times when you want to, well, choose and buy an RV.

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Cover of why caravans roll over by collyn riversCaravans and their tow vehicles rarely jack-knife and roll over - but when they do the results are catastrophic. The cause, and how to prevent it, is explained here.  Why Caravans Roll Over offers solid advice for keeping yourself safe on the road.

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Cover of caravan and motorhome books by collyn riversCaravan & Motorhome Electrics is the totally rewritten successor to the original globally selling Motorhome Electrics. The book's content now also covers every aspect of designing, installing and fault finding of the electrics in fifth wheel and conventional caravans, camper trailers and motorhomes.

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Cover of solar success by collyn riversSolar Success explains how to design and build home and property systems that ensures affordable solar success first and every time.

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Home page - rv books, collyn rivers, rv books for beginners, solar books, best rv books, rv repair books, solar success, caravan and motorhome electrics, solar that really works, the caravan and motorhome book, why caravans roll over, how to choose and buy an rvThe Caravan & Motorhome Book covers every conceivable aspect of camper trailer, caravan and fifth wheel caravan, campervan and motorhome usage. Like all of Collyn Rivers' books it is technically sound yet written in plain English.

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Cover of solar that really works by collyn riversSolar That Really Works! explains, in clear English, every detail of designing and installing solar in boats, camper trailers, caravans and motorhomes. It is up-to-date, valid globally and technically accurate. It is clear, concise and easy to follow without sacrificing important detail.

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How to Choose and Buy an RV

This is Collyn Rivers' newest book.  Building on his years of experience and extensive knowledge of engineering and all things caravan and RV, this is the book you need with you when shopping for an RV.

Caravan & Motorhome Electrics

Collyn Rivers has done it again! – if you need to know anything about motorhome electrics, then this book is for you... Collyn must be, without doubt, the foremost authority in Australia on this subject.

The Wanderer (Campervan & Motorhome Club of Australia Ltd)

Why Caravans Roll Over....and How to Prevent It​

Should be compulsory reading for everyone involved with Caravans: Design / Engineering, Marketing, Journalism (print & electronic), Regulations, Inspections, Driver-Training, Caravan Clubs, Towing and Modifications.

Colin Young

Founder and CEO, Caravan Council of Australia

Solar that Really Works!

Collyn is an accomplished engineer who knows how to design and build successful systems. It is refreshing to see practical advice written in plain language when there is so little solar information around. . . this is an essential text . . . you won’t find a better guide.

Alan T. Gray

Earth Garden Magazine

The Caravan & Motorhome Book

Without doubt, this is the best book we have ever read . . . it will be treasured, and read on a regular basis.

The Wanderer (Campervan & Motorhome Club of Australia Ltd)