Shore Power -- AC circuits


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johnaogren

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My '89 Westy has a second battery under the driver's seat and an auxiliary DC power outlet just aft of the stove. Running any kind of AC equipment leads to a rat's nest of wires, with an inverter plugged into the DC outlet and then my equipment plugged into the inverter. I'd like to get rid of that rat's nest by modifying the wiring to use the existing AC shore power outlets with my inverter, and I'm hoping to get some feedback from folks here who have tried something similar.

My idea is to mount a power transfer relay and the inverter in the dead space right behind the AC outlets. I would replace the existing AC circuit breaker with a new cover plate that has a small 12 VDC voltmeter, DC power outlet, DC circuit breaker, and AC circuit breaker.

I've posted a schematic diagram, cover plate layout diagram, and parts list at John's Westy Cabin Power.

Comments? Advice?
 

Capt. Mike

Moderator
There is a diagram of the late Type II Westy with the Rectifier (AC to DC power supply) in the Tech Drawings. "N" is the rectifier and you'll notice the AC comes to the AC outlets first and then just parallels to the rectifier. I would presume you could just substitute your inverter for "N". However, you may wish to install an either-or switch between them in case of an accidental plugging into shore power AC and having the inverter on at the same time so you wouldn't be feeding shore AC into the inverter AC end. The Vanagons did not come with a rectifier because they have LP fridge and it was assumed people would switch to LP as soon as stopped. The Type II's had the rectifier because they badly needed the DC for their AC/DC fridge and the heavy load on the auxiliary battery.
 

grapegrower

New member
Eno

Don't think the group understood that your westy is 220 volt (European Standard) instead of 110 (American). Circuit Breaker could be faulty, but it is more likely that you have a short to ground (insulation rubbed off a hot wire and touching the chassis. If you have an ohm meter you can check each wire for continuity to ground. Only the center wire should have zero ohms to ground. Good Luck.
 
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jerepowers

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Not sure this is the best place to post this. (Capt. Mike, feel free to move it.) I have added a small battery charger/maintainer to my 1984 Westy. It charges/maintains the second battery any time I am plugged into shore power. I have it plugged into the 110 outlet inside the under sink cabinet, where the refrigerator gets its 110 power. I used some double-sided mounting tape and have it in the area behind the fridge where I can see the lights if I really need to. Then the wires run under the bottom shelf to the second battery where it is wired permanently to the battery terminals. Because it is a battery maintainer, it only really charges if it needs to. I used this one in winter when I stored it. Now, when I store it in winter, I plug the Westy in at the shorepower outlet, run one maintainer from the 110 outlet in the main cabin to the main battery and the second battery is automatically connected.
 
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DANALEXANDER

New member
AC/DC fridge operation

Greetings from Portland,
A question about the AC/DC fridge function for our 82 camper. I run the fridge on shore power at home 24 hours before we depart. We take our goods directly from our house fridge to our camper after it has cooled to it’s setting point. I run the fridge on the 12v setting while we drive and then back to 110v when we have shore power again. Every once in a while I forget to switch over to AC. Is there a circuit that will stop the main battery from discharging beyond starting when the fridge is drawing power? And would putting a second battery into play take over the fridge power once the alternator is off and thus saving the main battery. Thanks
 

Capt. Mike

Moderator
:rolleyes: Guideline #4! These questions are explained in depth in FRIDGE and BATTERIES forums. We expect you to have the appropriate owners manuals for your vehicle and the Bentley factory shop manual to use this site (Guideline #2). Per that owners manual camper supplement, in a factory original single battery vehicle, the fridge ONLY runs on DC when the engine is running. The relay disconnects the battery and the fridge is "off" as soon as you stop the engine so it can't drain the main battery by forgetting to switch to shore power. It does not automatically switch to shore power or LP.

The "Second Battery" topic discusses a 2nd battery at length, including using w/ fridge, procedures to install, photos and wiring diagrams.
 
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Diyhell

New member
1993 Eurovan not charging from mains (shore) power

Hi - and greetings from Edinburgh, Scotland

The central electronic display in my 1993 Eurovan Westfalia shows the leisure battery charging (the power level increases from a poor 12.2v to 14.2v) when the engine's running but I do not see the plug indicator when I plug into the mains (shore) power. As the leisure battery power continues to drop over time when attached to mains power I've concluded it isn't charging.

I've checked the power output from the Philips charging unit (Type PE2169/20) and the Conv Pos and Conv Neg show 12V output with the mains power on. Having looked (endlessly...) at the Bentley manual's wiring diagrams X169 and related I can't see any fusing that could be blown that would be preventing the charge getting through or the plug symbol showing.

I'm at a loss as to why its not charging! OK, the leisure battery is rubbish and needs replaced but the lack of charge from mains power isn't helping...

Also, the Bentley wiring diagrams seem to show the 2 batteries linked in parallel - is this correct? What stops the leisure power consumption draining the vehicle battery - or is this the function of the Battery Cut Out Relay?
 

benferradini

New member
Re: 1993 Eurovan not charging from mains (shore) power

I own a 93 eurovan CV, and I have the same problem as mentioned by Diyhell in his previous post. I cannot see the "plug icon" on my central panel when i plug my West in the main power.

Does this mean it's not charging the secondary(auxiliary) battery?

It looks like the battery receives some power, because after discharging it totally by running the fridge for a few days, the battery returned to 13.6 v after 24 h being plugged to main power. But does this mean it's fully charged?

I just spent 600 CAN $ replacing the auxiliary battery and the charger, and the garage tech does not see anything wrong in the system. He is not a VW specialist though.

What do you think? Does that happen often? What's the solution?

Thank you

Benoît (Vancouver - Canada)
 

Capt. Mike

Moderator
This should be easy to check. Per Bentley wiring diagram #X169, your auxilliary battery is in parallel with the main without any controller between it and the charger. Disconnect the the charger (circuits #22 & #23 and test charger output, which I presume the tech has done. It doesn't take a specialist to check a voltage. If the charger is putting >12.6v into the system, which goes directly to the batteries, that's all it was designed to do. You recharged a battery -- what else are you expecting? Suggest you also see the TIPS forum, that discusses the ramifications of discharging any battery to "total" or dead-dead. Only a load test can tell if the battery is taking a full charge and has adequate reserve power. The 13.6v is only one indicator of battery health. SG is sthe true indicator as well as draw-down and recovery with the load test.
 
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