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Old 09-04-2022, 03:07 PM   #1
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Terrain alternator

Hi,
Does anyone know when the alternator is supposed start charging the house battery?
The battery is down to SOC 50% on the BMS.
And I do not see the dc Home Screen app showing that the alternator is charging.
Been driving it for about 45 minutes and yet to see the battery soc % go up.
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Old 09-04-2022, 05:12 PM   #2
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An engine alternator will start charging any battery connected to it as soon as it starts up. Granted it could be a small charge at first depending on the number of batteries it is charging.

I'm not sure how it is done with trailers but in a motor home there is a relay that kicks in when you start the engine. This relay, which may be on the firewall, connects the house battery to the engine battery's charging system. If this relay fails, which mine did, you will never charge your house battery while the engine is running.

Very easy to diagnose with a voltmeter. Start the engine and measure across the engine's battery. The voltage should be somewhere between 13 - 14.5 volts. If it measures mid 12s your alternator is not charging at all. If the voltage measures good, go to the house battery and measure across it. The voltage reading should be somewhat close to what the engine battery is reading.

I have attached a troubleshooting guide that may shed light on the thing.

If this is a trailer, there probably is something under the hood that performs the same function. When I had a camper I had to install the relay for this circuit. It could also be a battery isolation thing that is a largte heatsink with electronics in it. Had one of those for awhile.
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File Type: pdf Quick Multimeter Instructions (ver 1).pdf (376.3 KB, 1 views)
File Type: pdf RV Electrical Troubleshooting (ver 2).pdf (2.01 MB, 1 views)
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Old 09-04-2022, 05:30 PM   #3
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The 48v alternator will not charge the house battery at idle. It needs to be around 1500-2000 rpm to start charging, it has a variable output that shows charging amps on the screen and Vega Mira app. It will charge up the battery quick at freeway speeds. If your not charging, you have a parameter not correct, need to reset your battery, or have a open wire in the alternator circuit. I believe someone else found an open alternator wire and posted on this forum about it.
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Old 09-04-2022, 06:57 PM   #4
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Appreciate the help guys. I’ll go and do those checks.
Thank you
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Old 09-04-2022, 07:08 PM   #5
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I’m going over my settings. Whats ur settings? Would like to see if mine’s are set the same.
I just took delivery of mine’s from the dealership and found out about these issues. Smh
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Old 09-07-2022, 10:32 AM   #6
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Quote:
Originally Posted by Crazy_Ivz View Post
Iím going over my settings. Whats ur settings? Would like to see if mineís are set the same.
I just took delivery of mineís from the dealership and found out about these issues. Smh
https://www.jaycoowners.com/forums/f...s-95160-3.html Some of my settings differ a bit but IMO, this is a good reference. Please review that entire post, lots of good info.
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Old 09-10-2022, 07:44 AM   #7
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What color does your regulator blink?
Mine blinks green with a long pause in between, indicating that it is at idle.
In the jayco terrain manual it says it should be orange and if its green it has loss comm with the BMS.
Is there a way to re establish comm with the BMS?
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Old 09-26-2022, 07:45 PM   #8
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Quote:
Originally Posted by markb View Post
The 48v alternator will not charge the house battery at idle. It needs to be around 1500-2000 rpm to start charging, it has a variable output that shows charging amps on the screen and Vega Mira app. It will charge up the battery quick at freeway speeds. If your not charging, you have a parameter not correct, need to reset your battery, or have a open wire in the alternator circuit. I believe someone else found an open alternator wire and posted on this forum about it.
If I can find that thread, that's probably the same I'm experiencing with my unit. My APS-500 indicates it's not getting power from the alternator, and I found a blown fuse and keep getting blown. So I need to trace and do some trouble shooting.
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Old 11-03-2022, 10:59 PM   #9
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Mine was wired wrong. Guessing it happened to a lot of us as it seems a lot of us are having the same problems.
They wired the main panels to the charge controller that is for the external outlet for extra solar panels. The main panels need to be wired to the inverter. Once the tech figured this out my alternator and solar started keeping it charged up all the time. When driving daily No shore power needed with house power on 24/7.

https://f01.justanswer.com/qr9QXlWY/...s_overview.pdf
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Old 11-29-2022, 01:07 AM   #10
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Quote:
Originally Posted by Crazy_Ivz View Post
Hi,
Does anyone know when the alternator is supposed start charging the house battery?
The battery is down to SOC 50% on the BMS.
And I do not see the dc Home Screen app showing that the alternator is charging.
Been driving it for about 45 minutes and yet to see the battery soc % go up.
This is what I've noticed on my Terrain. When idling, the battery shows it's charging (though I doubt that it's really charging much if any). The manual states that a full charge state happens around 1500 RPM or higher. Checking the Firefly display lets me know that it is actually charging. Mine was at 90% today and driving around town, it charged back up to 100% in little to no time at all. If you have access to the Mira app it will also let you see in real time the charge rate go up on your battery.
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Old 12-01-2022, 06:08 PM   #11
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I decided to purchase the Mid-City Engineering high idle/remote start kit which arrived on Tuesday. It looks like a very well made unit and appears quite easy to install. Given that with normal consumption, the solar panels do not appear to provide enough power to offset a day's use, having this while boon-docking is going to be a necessity. I may also invest in the Renogy solar panel fold out pack.
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