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Open Roads Forum  >  Tech Issues

 > Renogy 20/40 amp DC to DC battery charger

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grizzzman

salt lake city, Utah

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Posted: 04/14/19 11:06am Link  |  Quote  |  Print  |  Notify Moderator

I just pulled the plug on a 40 amp unit. There Is a coupon for 20% off by giving them your email (the code is WELCOME10) At 179.99 for the 40 amp unit I could not pass it up! Look here
I will be using it as a backup charging source. With my solar I have not needed a alternate source as of yet, but I believe the day will come.

* This post was edited 04/14/19 04:55pm by grizzzman *


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2oldman

New Mexico

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Posted: 04/14/19 11:08am Link  |  Quote  |  Print  |  Notify Moderator

Your link isn't working because you've included 'have a look' at the front of the url.

Have a look

landyacht318

Near a large body of salty water

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Posted: 04/14/19 02:56pm Link  |  Quote  |  Print  |  Notify Moderator

Seems like a good solution to vehicles that only allow mid to high 13v when the house batteries are still depleted. I don't really like the 40 amp limit but 40 amps seeking mid 14's is better than a vehicles voltage regulator saying 13.7v is fine and dandy for those depleted batteries.

grizzzman

salt lake city, Utah

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Posted: 04/14/19 04:57pm Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

Your link isn't working because you've included 'have a look' at the front of the url.

Have a look


Thanks!

landyacht318

Near a large body of salty water

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Posted: 04/15/19 12:36am Link  |  Quote  |  Print  |  Notify Moderator

The Illustrated wiring diagram shows they want to pull both + and - from engine battery, instead of takng the + right from the alternator.
The latter is usually a shorter circuit which bypasses the 'just thick enough' stock wiring from alternator to engine battery and without a DC to DC device in the middle, will deliver more voltage and thus more amperage to depleted house batteries.

[image]

This 'just thick enough' stock wiring will now be asked to pass those 40 more amps when the renogy DC to DC charger is seeking 14.7v on a depleted house battery.

Might want to add more copper in parallel to the 'just thick enough' OEM wiring from alternator (+) stud to engine battery (+), properly fused of course. Also upgrading the ground wire from engine battery to engine block could be considered wise insurance.

Since it is taking whatever voltage the engine battery is at, and stepping it upto the 14.7, well the renogy unit will not generate as much heat stepping up 13.6 to 14.7 as it would stepping up 13.2 to 13.7v. it might add longevity to the unit to reduce the amount of voltage stepping it has to do by lessing voltage drop on the 'just thick enough' stock alternator to engine battery wiring that the beancounters insisted was adequate.

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