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Old 02-25-2018, 11:47 AM   #1
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Chassis battery

I leave our rv plugged in while in storage and start engine once a month and let run for a few minutes. Once house batteries are full does charge go to chassis battery? And does the on / off switch for house batteries come into play? Went to start today and had to use house battery power to start engine. Put trickle charger under hood....2015 e450 thor chateau
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Old 02-25-2018, 12:21 PM   #2
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Usually they donít combine from the house to chassis side. A echo charger can charge the chassis when the coach is plugged in.
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Old 02-25-2018, 12:41 PM   #3
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My RV does NOT charge the engine battery when plugged into shore power.

I use a knife blade disconnect on mine.

https://www.amazon.com/WirthCo-20108.../dp/B002OWFLC4

You could also use a trickle charger on the battery.
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Old 02-25-2018, 01:34 PM   #4
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On our "old " class A , I had to use a jumper cable from battery to battery under the hood to keep both house and chassis batteries charged. (plugged into shore power) This is built so you run down the house battery, you can still start the engine. BUT there are drains on everything....
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Old 02-25-2018, 01:43 PM   #5
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Under the hood of my C is a house battery charging solenoid that closes when the Key is turned on.

I wired a Cyrix battery combiner across both large terminals. Works great.

https://www.amazon.com/Victron-Cyrix.../dp/B00ZWLBZME
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Old 02-25-2018, 02:37 PM   #6
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

First, it is not recommended to just start the engine for a few minutes. You need to take the rig out for at least a 30 minute drive to exercise other systems such as transmission, etc.

Normally, charging the house batteries does not charge the chassis batteries.

Good luck, happy trails, and God bless!
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Old 02-25-2018, 07:07 PM   #7
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All these coach electrical systems work differently.
When plugged into shore power, my coach will charge the coach batteries and then chassis batteries once the coach charge reaches 13.3. When driving, the reverse is true...the alternator charges the chassis batteries, then when the charge gets to 13.3, the system lets the charge go through to charge the coach batteries.
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Old 02-25-2018, 11:59 PM   #8
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Quote:
Originally Posted by Cat320 View Post
All these coach electrical systems work differently.
When plugged into shore power, my coach will charge the coach batteries and then chassis batteries once the coach charge reaches 13.3. When driving, the reverse is true...the alternator charges the chassis batteries, then when the charge gets to 13.3, the system lets the charge go through to charge the coach batteries.
Yes, but we were talking about a Class C MH.
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Old 02-26-2018, 12:29 AM   #9
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Chassis battery

Quote:
Originally Posted by twinboat View Post
Yes, but we were talking about a Class C MH.


RV electrical is very similar across the different classes. Thereís a few different products being discussed.

1. Is a ACR, automotive charge relay. They work great because there is nothing to switch. It connects at 13.2v from either side,(converter or alternator) and gives full current, with no resistance loss like a isolator. It disconnects at 12.6 when all charge inputs are removed

https://www.bluesea.com/products/760..._12_24V_DC_65A

2. Is a Echo charger(as refereed above) they take a small, controlled amperage from one source battery to another, chassis to coach or vise versa. Like the ACR it requires no user input. It will tapper the amperage going to the 2nd battery as it reaches 100%. The only down side is a low charge transfer(15a)

http://www.xantrex.com/power-product...y-charger.aspx

3. Is a standard isolator, it only works from one power source(converter or alternator) to charge 2 battery banks. It is does this with a series of diodes, and through the process adds resistance to the wiring (voltage drop) like the other 2 above, does not require any user input. Would be best suited charging a aux battery wile driving, a standard relay, controls off the ignition would work more efficiently they a isolator.
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Old 02-26-2018, 08:11 AM   #10
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Have a E450 and it charges both directions. Found out long ago there are no absolutes when it comes to RV's, except they all cost $$$$. Been around even high end DP's with serial #'s single digits apart that had different parts, control boards. Seems strange as they should have been back to back on the assembly line.

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Old 02-26-2018, 08:40 AM   #11
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As a few have stated, there is no single answer to this question. Some manufacturers and models provide for chassis battery charging from shore power and others do not. And yes, the position of the battery disconnect(s), if provided. can have an effect. Again, it depends on how the charging system is designed and there is no one correct answer.

I don't know the right answer for his Thor Chateau, but the evidence suggests it does not charge the chassis from shore power. He can use a trickle charger or add a battery "echo charger" or "combiner" or a gadget called a Trik-L-Charge or Amp-L-Charge. Xantrex calls their solution an Echo Charger while Magnum/Dimensions names theirs a "Smart Battery Combiner". LSL Products does the Amp & Trik L-Charge products.
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