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Old 11-06-2018, 12:14 AM   #1
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2019 Open Road - Battery Charging

Okay, I'm fairly new to having a Tiffin coach. Can anyone explain how the new Open Roads charge the coach and chassis batteries? We have a Magnum 2000 inverter if that helps. Are both the chassis and coach batteries charged from shore power? Are both charged from the alternator when driving? We aren't using our RV right now but do have it plugged into 50amp service. I've been starting the engine thinking I needed to keep the chassis battery charged.
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Old 11-06-2018, 05:54 AM   #2
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It most likely has Bi-directional charging.

A device senses charging voltage on the house batteries from either the Magnum inverter/charger, while on shore power / generator power, OR it senses charging voltage on the chassis battery from the alternator, while the engine is running.

The device connects the chassis battery to the house battery with a high amp rated solenoid. Like an automatic jumper cable.

BIRD, IRD, BIM and a few other designations are used for that voltage sensing device.

Best bet is to pick up a cheap DC volt testing multimeter and while on shore power, check chassis battery voltage. If up above 13 volts your good.

As a RV owner, over time, you will find may other uses for the multimeter.
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Old 11-06-2018, 06:23 AM   #3
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My 2018 Open Road’s chassis battery does not charge when plugged in to shore power. I have a quick disconnect battery maintainer I hook up to the chassis battery when on shore power. When driving the coach both chassis and house batteries are charges.
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Old 11-06-2018, 06:59 AM   #4
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The chassis battery on 2018 and 2019 Open Roads is charged by merging the chassis and house systems using a heavy duty solenoid. This solenoid is controlled by the Spyder system. You can verify this by watching the chassis battery voltage on the main Spyder panel. When the voltage gets to12.5 volts, the systems merge and the chassis voltage will go back up.
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Old 11-06-2018, 08:48 AM   #5
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Open Road/Ford Chassis? Post #3 seems to be the correct answer. Tiffin has not provided chassis battery charging on the Ford chassis motorhomes in the past.
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Old 11-06-2018, 12:32 PM   #6
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Thanks for all the input.

My chassis and house battery shows on my Spyder control screen. I can also start my engine from the house batteries with a switch on the dash. Would this mean my chassis battery is connected to the inverter/charger?
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Old 11-06-2018, 02:09 PM   #7
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Quote:
Originally Posted by whciv View Post
Thanks for all the input.

My chassis and house battery shows on my Spyder control screen. I can also start my engine from the house batteries with a switch on the dash. Would this mean my chassis battery is connected to the inverter/charger?
No, the inverter/charger is only connected to the house battery.

The switch connects the house battery to the chassis battery.
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Old 11-06-2018, 09:13 PM   #8
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VWD

Are you saying the chassis batteries are charged when they reach 12.5V by shore power.
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Old 11-06-2018, 09:31 PM   #9
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After reading the Spyder data the merge voltage is actually 12.4 volts. When chassis battery reaches this point and other criteria are satisfied, the Spyder system will energize the merge solenoid to charge the chassis battery. This is the same solenoid that is actuated by the switch on the dash.

http://spydercontrols.com/wp-content...Module-1v2.pdf
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Old 11-06-2018, 10:34 PM   #10
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Quote:
Originally Posted by McCampbell View Post
My 2018 Open Road’s chassis battery does not charge when plugged in to shore power. I have a quick disconnect battery maintainer I hook up to the chassis battery when on shore power. When driving the coach both chassis and house batteries are charges.
Actually, your chassis batteries will charge from the converter, but you have to leave the house batteries turned on and the Spyder system active for them to charge. The charging of both house and chassis batteries are controlled by the Spyder.
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Old 11-07-2018, 01:36 PM   #11
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Here is the response from Tiffin:

You have equipped what we call a Power Merge Board. Its purpose is to distribute charging power between both banks of batteries whether it be from alternator or inverter.
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Old 11-07-2018, 01:43 PM   #12
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Quote:
Originally Posted by whciv View Post
Here is the response from Tiffin:

You have equipped what we call a Power Merge Board. Its purpose is to distribute charging power between both banks of batteries whether it be from alternator or inverter.
Here is the documentation from Spyder on how the Power Management Module works. As I previously posted, the house batteries have to be turned on and the Spyder system active for the PMM to work and charge the chassis batteries.
Attached Files
File Type: pdf Spyder Power Management Module 1v2.pdf (113.6 KB, 57 views)
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