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Old 02-06-2017, 01:51 PM   #1
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Exclamation Drawing up the entire electrical system

So this stuff is complicated. I have been reading this forum for the last few days, and have read a lot of the topics. I came up with this drawing to help me put this together and to hopefully have you guys point out any flaws. Cause you know I would hate to electrocute my wife. She totally wouldn't forget/forgive that.

So some questions to start. Outback inverters/chargers. Anybody using them here? What is your opinion on the brand or this specific inverter?

Does all of the AC grounds go to one ground bus bar? Even like the chassis grounds (generator, inverter)? Is that then grounded to the bus chassis?

How big of a fuse/circuit breaker between the inverter and the battery bank? Do I need one there? Or just a disconnect? I'm guessing I would need a 150A? 120V*30A AC RMS=3600/24V=150A DC.

I copied and pasted the Shore/Gen part from Outbacks installation sheet. Would I really be shorting the Neutral and Ground together?

Any other safety pieces that I am missing? Something you would change? Something out of whack with my calculations? Two pieces just really out of sync, size wise?

My load would be about 4KWH per day.

Thanks for any input!

Nick
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Old 02-20-2017, 02:59 PM   #2
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Magnum energy msh4024m, 4000w 24vdc hybrid pure sine inverter charger

MAGNUM ENERGY MSH4024M, 4000W 24VDC HYBRID PURE SINE INVERTER CHARGER

How do you handle 24V systems? How do you use the alternator as a charging source? How do you power 12V accessories? Is everyone just setup as a 12V systems?

Nick
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Old 02-20-2017, 04:52 PM   #3
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Hey MM, that's quite the set up. going solar for me is on the horizon but not the near future. i believe there are charge controllers that you hook to the solar panels that have additional inputs for you alternator or generator.

the grounding questions you ask are pretty heavy. i can't give you a decent response. RV grounding is not a yes or no question. it needs to be understood, why and how.

the problem of rv grounding when using a generator vs a shore is that if you bond neutral and ground inside your rv for the generator, any plug into shore power would detect that as a fault and trip the shore line.

i don't understand 30A well enough to answer how to fix it. my system is 50a, different enough that i can't help.

24v would be nice. My setup is 12v. i don't know how you'd step down 24v to 12,(maybe a transformer) but there are lots of truck, bus accessories that run 24v, so the more of that you use, the more efficient it is.

the rest of your answers should be in the inverter manual.
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Old 02-20-2017, 06:26 PM   #4
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magnum makes a great inverter/ charger. at 24 volt a 250 amp fuse would do. its best to go 12 volt for our application, just so much easier. you will need a charge controller between the panels and the batteries.
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Old 02-20-2017, 07:41 PM   #5
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You need to ground the AC to the steel bus body to avoid the possibility of a "hot skin" condition.

Check out "The No Shock Zone" for more info.

RV Electrical Safety: Part IV – Hot Skin | No~Shock~Zone
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Old 02-21-2017, 12:31 PM   #6
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Great Info

Thanks all. I was thinking 12V was the way to go.
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Old 03-22-2017, 01:39 PM   #7
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So I purchased a msh3012m

After doing some calculations we would use 2498WH per day for both the 12V & 120V applications. Then I multiplied the 120V applications by 1.15 to compensate for inversion loss to come up with 2793WH per day. A family of 5 can use some power! I estimated a little high, but I figure that is the way to go.

If I go with 4 T-105's that will get me about .9 days of power at 50% discharge. So I'm thinking I should go with 8 batteries to get 1.7 days. Then I could run the generator for 3-4 hours every day to top them back off without worry.

There won't be any solar, just shore and generator.

Questions:
1) Does anyone have a diagram how 8 - 6V batteries should be wired for 12V output? I can't find that exact diagram. I think I know how, but I want to know. Don't need to melt anything

2) What gauge wire should I be using to connect the batteries/inerter? The battery to inverter will only be 4 foot max.

3) Should I even try to connect the alternator with a disconnect? Or is this bank just too large and will kill my alternator?
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Old 04-07-2017, 11:01 AM   #8
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Need your help!

I've updated my drawing based on some of the things that I have bought.

Did I wire the batteries up right?
Wire gauges seem right? Too big, Too small?
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Old 04-07-2017, 11:12 AM   #9
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Quote:
Originally Posted by MasterMerck View Post
I've updated my drawing based on some of the things that I have bought.

Did I wire the batteries up right?
Wire gauges seem right? Too big, Too small?
I suggest you read SmartGauge's recommendation on battery wiring: SmartGauge Electronics - Interconnecting multiple batteries to form one larger bank There's a lot of other useful info on their site.

John
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Old 04-07-2017, 12:03 PM   #10
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Originally Posted by Iceni John View Post
I suggest you read SmartGauge's recommendation on battery wiring: SmartGauge Electronics - Interconnecting multiple batteries to form one larger bank There's a lot of other useful info on their site.

John
That is some GREAT information! Finally! Thank you!

Updated. Can you give it a look again?

Thanks,

Nick Zircher
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