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 > 1-2-All Switch Wiring?

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BFL13

Victoria, BC

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Posted: 11/25/20 07:55pm Link  |  Quote  |  Print  |  Notify Moderator

Got this big DC switch (6"diameter) with the TC, not connected , no instructions. Been meaning to ask how to wire it up, so here goes:

On the front it has a big switch handle that can point to:
Off/1/All/2

Says it is good for 210 amps continuous, 315 intermittent, and "before switching to Off position, turn off engine."

On the back it has three posts:
"Terminal 1 NIDCO"
"Common", and
"Terminal 2"

I failed the IQ test for how to hook up two 12v batteries to this thing. and where do the pos and neg load wires go? Thanks!

(I am also worried it says "all" instead of "both" but it only has the two terminals marked 1 and 2. I am pretending I can't see that)


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CA Traveler

The Western States

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Posted: 11/25/20 08:33pm Link  |  Quote  |  Print  |  Notify Moderator

Terminals 1 and 2 are for 2 battery banks, positive wire. Common is the output for non engine (dual engines) boat power, no negative connection. It's a common switch used in boats. All can be used to start a engine if it's battery is low, otherwise 1 or 2 can supply the boat house power which should include a third battery. At anchor Off is the desired position as the very last thing you want is a low engine battery.


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S Davis

Western WA

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Posted: 11/25/20 09:17pm Link  |  Quote  |  Print  |  Notify Moderator

The wiring is as described above, here is a picture of my two battery bank switch. One positive from each bank and common to 600amp buss bar.

Battery switch

BFL13

Victoria, BC

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Posted: 11/25/20 10:02pm Link  |  Quote  |  Print  |  Notify Moderator

So the negs from each battery go to a buss where the neg load wire also goes (such as the RV frame)? And one pos wire to 1 and the other to 2, and the pos load wire goes to "Common" ?

In "All", that links 1 and 2, putting the two 12s in parallel, and in "Off" the links between Common and 1 and between Common and 2 are opened?

What was that about a third battery? Yipes!

S Davis

Western WA

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Posted: 11/25/20 10:27pm Link  |  Quote  |  Print  |  Notify Moderator

That sounds right, I have another 600amp buss that the battery negatives from both my banks and the truck/frame tie to for the charging circuit from the truck.

wa8yxm

Wherever I happen to park

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Posted: 11/26/20 04:04am Link  |  Quote  |  Print  |  Notify Moderator

1 and 2 go to the batteries
Common goes to the "House"

NOTE: I do not recommend isolating the two banks unless you need a "Back up" system. the reason is Peukert's law, which basically says the faster your draw current off a battery the faster still it runs down. So by dividing the load between TWO parallel batteries (or more) you get more power out of them before dead.

But if say bank one is 4 GC-2 in series parallel and bank 2 is a single Group 27 just in case so you can start the Generator (with a Battery Tender or other small 3-stage charger on the 27) then by all means run off just bank one.


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CA Traveler

The Western States

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Posted: 11/26/20 07:22am Link  |  Quote  |  Print  |  Notify Moderator

Three batteries are common for a boat, one for each engine and one for the boat house. My boat had 3 8D's. Analogous to a MH with 1 for the engine and one for the house.

BFL13

Victoria, BC

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Posted: 11/26/20 11:33am Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the help with this switch. I am thinking it could be used for my situation with one solar set and two different battery sets in the TC. I don't want to parallel the batts, but with this thing, perhaps you could do one battery bank at a time with the one solar set. Have to work on that to see where the wires would all go.

MEXICOWANDERER

las peƱas, michoacan, mexico

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Posted: 11/26/20 12:45pm Link  |  Quote  |  Print  |  Notify Moderator

With a SMART BATTERY CHARGING SOLENOID the issue is limited solely to Battery Discharge. Forgetting to allowing charge is a major issue.

pianotuna

Regina, SK, Canada

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Posted: 11/26/20 05:52pm Link  |  Quote  |  Print  |  Notify Moderator

I chose to use two switches that are just "on and off". They used to be inexpensive at about $7 cdn each. 200 amps continuous and 1000 amps contacting.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

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