Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 09-16-2019, 09:16 AM   #1
Junior Member
Join Date: Aug 2019
Posts: 6
How do I set the AGS?

Hello All.

I recently purchased a used 2018 Fleetwood Discovery LXE 44H. The coach has all kinds of goodies in it, including a Firefly system that controls most of the coach's functions.

One thing that's stumping me is how to set the automatic generator start (AGS) function on the Firefly system. Fleetwood has told me that the AGS should be set so that the Onan 8K generator goes on when battery power drops to 11 volts, and shuts off when the battery power reaches 13.5. However, that doesn't seem to work.

First of all, whenever the battery reaches 12.1, we get a message on the Firefly saying that battery power is dangerously low. So, obviously, setting the AGS at 11 volts would be setting it too low for this coach.

Second, the other night we were dry camping and had the AGS set per the above parameters. We found that the Aquahot (which was set on diesel because it was cold outside and we were not hooked up to power) did not go on (so we had neither hot water nor heat), because the battery voltage was too low. The AGS was set to activate at 11 volts, as per Fleetwood's parameters, but at 12 or 12.1 volts the Aquahot diesel system won't operate.

I'm trying to figure out how to set the AGS and still use the Aquahot on diesel. So I set the AGS to activate at 12.4 volts (which is high enough for the Aquahot to work on diesel) and to shut off when the batteries reach 14.3 volts. (They routinely reach 14.5 when fully charged.)

Does anyone have any comments/suggestions on how to set the AGS? Is the above correct, when considering the requirements for using Aquahot's diesel function?

Also, when we're not using the Aquahot, should the AGS settings be the same?

Finally, one of the Fleetwood tech support people told me to set the AGS so that once the battery voltage reaches the upper AGS limit, the generator will keep running for an hour. His explanation for this was that our 6-volt house batteries need a "deep charging". Does that make sense? Should the generator continue to run at all once the upper AGS voltage limit has been reached? If so, for how long should it run?
Travelmaven is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free! RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 09-16-2019, 11:26 AM   #2
"Formerly Diplomat Don"
Dutch Star Don's Avatar
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 21,102
"Travelmaven".....I don't know what inverter/charger your coach is using. If it's a Magnum, look at your batteries and note the number of batteries, brand and amp hour rating. Once you have this info, call Magnum from inside your coach. They'll walk yo through ALL the appropriate settings for your coach, battery size and AGS. If it's a Zantrex, I'm sure they can help in the same way.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
Dutch Star Don is online now   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
AGS setup advice needed and question about AGS firmware version tnedator Newmar Owner's Forum 24 08-13-2019 04:34 PM
How to set AGS so AquaHot heats coach in open storage? pduggs Monaco Owner's Forum 11 10-17-2018 11:32 AM
Magnum ME-AGS-S Standalone AGS mikelm48 Newmar Owner's Forum 3 02-23-2016 08:28 AM
AGS temp sensor, set point/delay? nebster Newmar Owner's Forum 38 04-13-2015 12:16 PM
AGS Issue: 2010 Paeton 40-QTH AGS Issue gjw Tiffin Owner's Forum 1 09-06-2013 04:46 PM

» Featured Campgrounds

Reviews provided by

All times are GMT -6. The time now is 04:28 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.