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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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  #1  
Old 11-23-2010
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Default UPS True Sine Wave Inverter Ready to mount

Well I have finished the mods for the UPS I was modifying.
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Last edited by Christian; 04-24-2011 at 07:01 PM.
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Old 11-24-2010
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Christian,
does the fact that the UPS is 48V mean that you cannot use those batteries to run 12V appliances in the rest of the coach? Seems like a good deal, but limiting if you are carrying those batteries just to run the UPS / inverter.

Doug
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Old 11-24-2010
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Christian,
does the fact that the UPS is 48V mean that you cannot use those batteries to run 12V appliances in the rest of the coach? Seems like a good deal, but limiting if you are carrying those batteries just to run the UPS / inverter.

Doug
In short no.
You could incorporate a series of 3 phase breakers/relays/plugs to isolate and reconnect the bank back to 12 volt to power the MH house..the plugs would be the cheapest and would require rewiring in a pinch. I have over sized the banks and have a set for 12 volt and a set for 48volt the 48 volt is under the curbside bed behind the electric heater and under the drawer this was dead space anyway so I don't figure I lost anything but weight..
I wanted a spare AGM pack in the warmth in case I needed to start the motor or Genny with a boost from the 120v chargers.... or a direct connect...
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Last edited by Christian; 04-24-2011 at 07:02 PM.
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Old 11-25-2010
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Gotcha, sounds like you are using them exactly as I had thought...connected in series at 48V. Of course, in a pinch, you could reconfigure or use a more complicated set of relays / switches to reconfigure.

That wasn't really my question.

Clever use of your resources and technology nonetheless and thank you for the explanation! Fine job!

Doug
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Old 11-25-2010
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But The good thing is it does not require the current of a 12 volt unit. Also the batteries can be changed with new ones as they become weak since they are all 4 in series.... 1 bad one won't kill them all. Can't do any of that with parallel packs.....
I'm not sure I understand your statement.

Batteries in series are vulnerable to bad batteries. If a battery shorts you're down to 36v, if a battery opens you have 0v as they are in series.

The only difference between series and parallel is that the out come is reversed for the same battery issues.

Batteries in parallel are vulnerable to bad batteries also. If a battery shorts you're down to 0v and it drags down the other batteries, if a battery opens you have 12v as they are in parallel.

Did I miss something you stated?
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Old 11-26-2010
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I'm not sure I understand your statement.

Batteries in series are vulnerable to bad batteries. If a battery shorts you're down to 36v, if a battery opens you have 0v as they are in series.

The only difference between series and parallel is that the out come is reversed for the same battery issues.

Batteries in parallel are vulnerable to bad batteries also. If a battery shorts you're down to 0v and it drags down the other batteries, if a battery opens you have 12v as they are in parallel.

Did I miss something you stated?
No I think you have the point. The UPS will disconnect at 42 volts. Also when open condition happens the unit will open.
A bad battery in series will not kill the others in series. In paralell it will kill the others. Neither condition will continue operational while in a faulty condition.
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Old 11-26-2010
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Thanx Richard.. We're on the same page.
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