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Topic: Two EMS voltage protectors (Read 653 times) previous topic - next topic

Two EMS voltage protectors

Several months ago there was a Forum discussion about the pros and cons of wiring Progressive Industries over/under voltage EMS protection before and after the transfer switch.  It seems that each side has advantages and disadvantages. 

Seven years ago, we installed an EMS after our transfer switch and it has worked just fine, and recently protected our coach from a faulty generator voltage regulator. 

During the Forum discussion it was pointed out that a faulty campground connection could take out a transfer switch which could allow faulty current to flow backward and damage our generator.  So we decided to install a second Progressive Industries EMS before our transfer switch and now we are protected on both fronts.

We followed Dave Metzger's lead and used SO #6 cable with 18-10 crimp sleeves to contain the fine strands of copper in relay connectors.
Our kitchen battery monitor corner now has two EMS meters, one we call primary and one called secondary.

Re: Two EMS voltage protectors

Reply #1 –
That's kind of the way I'm leaning, but with several other projects going, and still nine days of school left (and 11 days after that), it will be a while before I actually have to make a decision.

Re: Two EMS voltage protectors

Reply #2 –
I am considering a hardwired ems also. My question is, what if the ems fails? That leaves you with no way to apply power while waiting for a replacement correct? I thought maybe a plug in would be better if that were to happen you could just unplug it.

Mark

Re: Two EMS voltage protectors

Reply #3 –
Mark,

The hard wired Progressive Industries with remote I have in my coach uses the on/off switch in the remote to bypass the ems.

Plus, if you can put one in yourself, you can remove it too.

Re: Two EMS voltage protectors

Reply #4 –
Mark,

On mine you can open the case and bypass the unit if you don't have the remote switch.  From the manual:

Bypass
Enclosed blue jumper wire allows the user to bypass the computer circuit in the EMS in the event of computer failure, thus allowing AC power into the RV. This does not disable the surge protector portion of the EMS; however, all other features are disabled.

Keith
 

Re: Two EMS voltage protectors

Reply #5 –
Thanks Rudy and Keith for the info.

Mark