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Open Roads Forum  >  Truck Campers

 > Gut check on transfer switch for inverter - special case

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time2roll

Southern California

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Posted: 08/27/20 06:45pm Link  |  Quote  |  Print  |  Notify Moderator

I put my converter on a separate breaker to use as a switch.


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thedavidzoo

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Posted: 08/27/20 07:34pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks everyone. I have probably beaten this dead horse by now.[emoticon]


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Z-Peller

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Posted: 08/27/20 07:43pm Link  |  Quote  |  Print  |  Notify Moderator

A converter uses 110v power to make 12v power and feed it to the batteries. Inverter draws 12v from batteries to make 110v power. You say your converter runs on 12v??...don’t see how.....Check your 110v breaker panel for converter breaker and switch it off. No more converter producing 12v power when you are running inverter for 110v power. There is nothing at converter for 12v wires to backfeed. Wire your inverter thru generator feed which will go to 110v breaker panel then you can turn breakers on or off to select what you circuits you want on or off.


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DWeikert

York, PA

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Posted: 08/28/20 09:18am Link  |  Quote  |  Print  |  Notify Moderator

Hemi Joel wrote:

I didn't think you could run 2 solar charge controllers in parallel? Doesn't one sense the output of the other and interpret that as a fully charged battery, cutting 1/2 your solar array out?

Since the charge controllers monitor battery voltage that would only happen when the battery is fully charged. Or at least one of the controllers thinks it is.

Once the batteries approach full charge the controller set to the highest voltage would be the last one providing current. For example, if controller A is set to 14.38v and controller B is set at 14.42v, controller A would stop providing current at 14.38v then controller B would provide the last bit of charge until the batteries reach 14.42v. But I doubt that's going to be a problem.


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12thgenusa

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Posted: 08/28/20 10:19am Link  |  Quote  |  Print  |  Notify Moderator

You are correct in that as you have it drawn there is not a charging loop between the converter and inverter however, powering everything through the inverter is very inefficient and overly complex. You have losses inverting 12V to 120V and then back to 12V through the converter to power the 12V items.

A much better way is to leave the 12V distribution panel connected to the batteries and disconnect the 120V feed to the converter. Another plus is that in the event of an inverter failure all 12V items would still operate.


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thedavidzoo

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Posted: 08/28/20 01:12pm Link  |  Quote  |  Print  |  Notify Moderator

12thgenusa wrote:

A much better way is to leave the 12V distribution panel connected to the batteries and disconnect the 120V feed to the converter. Another plus is that in the event of an inverter failure all 12V items would still operate.


Yes, this is now the plan!

2oldman

New Mexico

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Posted: 08/30/20 12:51pm Link  |  Quote  |  Print  |  Notify Moderator

12thgenusa wrote:

You have losses inverting 12V to 120V and then back to 12V through the converter to power the 12V items.
I don't see that.

computermonkey

Oklahoma

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Posted: 08/31/20 04:57pm Link  |  Quote  |  Print  |  Notify Moderator

Example of what I did. I wanted to power every 110v socket through the inverter. I added a second transfer switch making the inverter dominant, that way power from the first transfer switch would be on all the time until inverter was turned on then twenty seconds later the transfer switch would allow the power from the inverter.

I have two circuits coming off the battery. One is a 100amp BMS. The camper's 12v power and charging is done through this. Also has temp cut off so if to cold it will stop the charging from damaging the batteries. Second is a 250amp using 4/0 wire going to a 3000watt inverter with a low volage battery disconnect.

I set the refrig to propane and unplug the converter. Charging is done mostly there solar.

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