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RV Solar and Alternator Charging

RV Solar and Alternator Charging

You can make RV solar and alternator charging work. It is complex on post-2014 vehicles. This article explains how.

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How RV solar and alternator charging works

A travel trailer or motorhome battery charges by connecting it across it a source that has a voltage that is higher than that battery has at the time. That battery neither knows nor cares whether that charge is from one source or several. Those sources must all be of closely similar voltage. Ideally, they are identical. If not, the battery will draw mostly from that with the highest voltage. Charging becomes complicated, however, once the battery/s approach full charge.

What happens then is that the controllers associated with each charging source mistake each other’s voltage for the battery. This may cause damaging overcharging. This is particularly so with AGM and LiFePO4 batteries. This applies also to simultaneous solar and generator charging. Do not attempt to do this yourself unless you know how. This explained in our book Caravan & Motorhome Electrics.

Suitable controllers for RV solar and alternator charging.

Most controllers sold for both solar and alternator charging, monitor both solar and alternator input but do not combine them. They switch to whichever has the higher input at the time. Solar Books recommends RV solar users to do likewise. This is particularly so with most vehicles made since 2010 or so and virtually all since 2014.

Issues with post-2014 RV solar and alternator charging

Prior to 2014 or so, vehicle alternators produced about 14.2 volts for some minutes after engine starting. This dropped to a more or less fixed 13.6 volts thereon. This, by and large, presented no issues for RV battery charging. Such alternators had a high enough voltage to charge a secondary battery in the vehicle to a usable level for leisure or auxiliary use. Ongoing emissions regulations however require minimising power usage. This (in 2014) extended yet further – to vehicle alternators of variable voltage.

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Electrical (general)
Batteries & Battery Charging
Trailer/Tow Vehicle Behaviour & Suspension
General
Travel
The Camper Trailer Book

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

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. 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, travel trailers 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 travel trailers, 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, travel trailer and fifth wheel travel trailer, campervan and motorhome usage.

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Cover of Why Caravans Roll Over by Collyn RiversTravel trailers 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 RiversTravel trailers 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 travel trailers, 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, travel trailer and fifth wheel travel trailer, 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, travel trailers 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 travel trailer 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 Travel trailers: Design / Engineering, Marketing, Journalism (print & electronic), Regulations, Inspections, Driver-Training, Travel Trailer 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)