Good Sam Club Open Roads Forum: Redarc 40 amp DC to DC Charger issue
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 > Redarc 40 amp DC to DC Charger issue

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Teleman

Clayton, CA, USA

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Posted: 01/18/22 11:28am Link  |  Quote  |  Print  |  Notify Moderator

After about 15 seconds or so when I start the engine my shunt reads up to almost 49 amps and then the 60 amp input breaker pops. Whats going on here? Isn't the charger supposed to limit the output current to 40A?

Horsedoc

Dixie --- N. Georgia

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Posted: 01/18/22 11:36am Link  |  Quote  |  Print  |  Notify Moderator

dead short?

Teleman

Clayton, CA, USA

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Posted: 01/18/22 11:47am Link  |  Quote  |  Print  |  Notify Moderator

Horsedoc wrote:

dead short?

I don't see how. It would trip immediately.

KJINTF

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Posted: 01/18/22 01:11pm Link  |  Quote  |  Print  |  Notify Moderator

Might be normal, If your Redarc is anything like my Victron 18amp which has no current regulation. Me I'm very disappointed in the Victron DC to DC chargers they offer no way to adjust the output current. Check out their web site forum and the many many complaints regarding this issue. Even worse my Isolated 18A max DC to DC charger, charges my 200amp/hr Li battery at 26amps! WTF! Had to return the 40amp version it went to as much as 70amps with no way to adjust the current.

KD4UPL

Swoope, VA

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Posted: 01/18/22 01:24pm Link  |  Quote  |  Print  |  Notify Moderator

What voltages? Where are you measuring current; on the input or output? If you are charging to 14.7 volts at 40 amps but only receiving alternator power then it would take 14.7 x 40 / 13.8 = 42.6 amps input not accounting for the converter efficiency.

LittleBill

Scranton, PA USA

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Posted: 01/18/22 02:54pm Link  |  Quote  |  Print  |  Notify Moderator

Teleman wrote:

After about 15 seconds or so when I start the engine my shunt reads up to almost 49 amps and then the 60 amp input breaker pops. Whats going on here? Isn't the charger supposed to limit the output current to 40A?


what side are you reading on? its 40a on output, breaker shouldn't be tripping at 50 amps either.





Teleman

Clayton, CA, USA

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Posted: 01/18/22 03:37pm Link  |  Quote  |  Print  |  Notify Moderator

LittleBill wrote:

Teleman wrote:

After about 15 seconds or so when I start the engine my shunt reads up to almost 49 amps and then the 60 amp input breaker pops. Whats going on here? Isn't the charger supposed to limit the output current to 40A?


what side are you reading on? its 40a on output, breaker shouldn't be tripping at 50 amps either.

Looking at the house battery shunt. Seems to have stabilized at about 43 amps. Breaker trips at about two minutes making me think it's a **** breaker. I'll check with a clamp on ammeter tonight.

* This post was edited 01/19/22 09:16am by Teleman *

theoldwizard1

SE MI

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Posted: 01/18/22 04:28pm Link  |  Quote  |  Print  |  Notify Moderator

Any time there is a current question check/clean all connections !

theoldwizard1

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Posted: 01/18/22 04:30pm Link  |  Quote  |  Print  |  Notify Moderator

KD4UPL wrote:

What voltages? Where are you measuring current; on the input or output? If you are charging to 14.7 volts at 40 amps but only receiving alternator power then it would take 14.7 x 40 / 13.8 = 42.6 amps input not accounting for the converter efficiency.

Check voltage at the vehicle battery and at the house battery (before the trip).

S Davis

Western WA

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Posted: 01/19/22 08:23am Link  |  Quote  |  Print  |  Notify Moderator

Something sounds off, I have the 50amp Redarc and it draws exactly 50amps from the alternator/truck battery and output is about 47amps to the batteries.

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