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Onan 7.5 JB Information Monitoring Panel


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  #1  
Old 11-02-2017, 11:07:12 AM
mjd325is mjd325is is offline
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Default Onan 7.5 JB Information Monitoring Panel

Hi everyone,
The power outages here in NH have prompted me to get my 7.5 JB connected and ready. Right now its sitting unconnected on a pallet in my basement. I am planning on building an small shed, or "doghouse" for the JB about 50' away from my house where it will be connected to propane. I want to monitor the load, voltage and frequency so I can manually manage the breakers. I was planning on putting together a little "monitoring panel" in my basement where I could do this. I'm looking at LCD meters on Amazon like this:
https://www.amazon.com/DROK-10-199-9...6N0DTP0YGQW564

My question is, are these accurate enough (for the price)? I'm thinking of getting one for frequency, one voltage, and one for amps. Mount them on a nice little enclosure box located in the basement, next to the main breaker panel for the house. I was also considering a 120V indicator light to show when utility power is available.

Anyone ever try to do a remote engine temperature (oil maybe?) or oil pressure gauge? Maybe I'm getting too fancy.

Curious to know thoughts on this.

Thanks,
Matt
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Old 11-02-2017, 11:59:04 AM
DMeed DMeed is offline
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Default Re: Onan 7.5 JB Information Monitoring Panel

If you are running 120/240volts at 30 amps into the house instead of 120volts only at 60 amps - you will want to monitor _both_ power legs - so budget for two amp meters.

Do some searching - someone was trying to use a cheap multimeter and had issues with it not reading correctly on an onan with brushes - I think it was the frequency function - the meter was being fooled by the hash from the brushes on the power line.

That being said - I installed a pair of "volt/amp" meters on a westinghouse gen set so I can monitor voltage and amps on both lines.

Something like these https://www.amazon.com/GEREE-Multime...lt%2Famp+meter and they worked fine the couple of times I've needed the gen set since.
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Old 11-02-2017, 01:44:29 PM
GMGuy GMGuy is offline
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Default Re: Onan 7.5 JB Information Monitoring Panel

JohnnyC has made several monitoring panels and I know there are posts of them somewhere on here. I am sure he would share his plans and schematics.
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Old 11-02-2017, 01:49:04 PM
len k len k is offline
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Default Re: Onan 7.5 JB Information Monitoring Panel

Quote:
Originally Posted by mjd325is View Post
Anyone ever try to do a remote engine temperature (oil maybe?) or oil pressure gauge? Maybe I'm getting too fancy.
I'm sure there are after market remote monitoring kits available, both wireless and hardwired

Most Onans have automatic low oil pressure shut down. Can add high temp shutdown switch to controls to automate that too. Better to have genset automatically shut down rather than relie on you to ALWAYS watch it 24/7 and eventually get around to intervening and manually shutting it off. Such as when you get preocupied by something else.....like sleep.
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Old 11-02-2017, 03:42:12 PM
whiteblaze whiteblaze is offline
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Default Re: Onan 7.5 JB Information Monitoring Panel

Most automotive gauges rely on electric senders and gauges. Should not be an issue for remote gauges.
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Old 11-02-2017, 03:48:31 PM
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John Newman, Jr. John Newman, Jr. is offline
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Default Re: Onan 7.5 JB Information Monitoring Panel

Don't know if it counts as remote, but I added mechanical oil temp and pressure gauges to my 10CW. Access plate on crankcase was thick enough to drill & tap for a NPT fitting that the temp sender screws to.
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Old 11-02-2017, 07:33:46 PM
len k len k is offline
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Default Re: Onan 7.5 JB Information Monitoring Panel

For long distance hardwired monitoring, easy enough to find variable resistance oil pressure gauge and likely temp gauge too and rig up a 12VDC regulated supply to power them. Simple analog meter. If currents are low might have to run the wires separate from power leads so don't get cross talk between them. ( cap and transformer issues).

2ft separation is typical on long parelle signal and power wires. Think for cable TV/ phone/ utility buried lines code says 3 ft
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Old 11-09-2017, 05:36:50 PM
EICBob EICBob is offline
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Default Re: Onan 7.5 JB Information Monitoring Panel

After this round of NE wind storm power failures. It became apparent to me that even though I have a monitoring panel set up, reading total output voltage across each leg as well as amperage across each leg, I was having a brain cramp trying to balance my loads. (and not overload the unit)
So what I am wondering, as a general rule of thumb, when the data plate on your generator gives a value such as 20.8 AMPS @ 120/240 Volts, is that across each leg or the combined total across both legs?
Please forgive me if this has been discussed before.

Thank you kindly

-Bob
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Old 11-09-2017, 09:22:09 PM
jack0 jack0 is offline
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Default Re: Onan 7.5 JB Information Monitoring Panel

With those Chinesium meters. Analog is the way to go. At least you can adjust them to a known accurate meter.
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Old 11-09-2017, 10:54:37 PM
Jack Hottel Jack Hottel is offline
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Default Re: Onan 7.5 JB Information Monitoring Panel

Quote:
Originally Posted by EICBob View Post
So what I am wondering, as a general rule of thumb, when the data plate on your generator gives a value such as 20.8 AMPS @ 120/240 Volts, is that across each leg or the combined total across both legs?

-Bob
You may draw up to 20.8 Amps from any leg. It may return to the Neutral (120 volt load) or to the other leg (240 volt load), or any combination of both. To exceed that current may over heat the windings and cause damage.
Jack Hottel
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