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05-06-2016, 09:11 PM
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#1
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3 Rivet Member
2015 Interstate Ext. Coach
Tega Cay
, South Carolina
Join Date: Jan 2015
Posts: 135
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I just don'the understand how the inverter works
We just replaced the 2 batteries that came with our 2015 interstate with 4 batteries in order to so some boondocking. My question is when should we use the inverter . The tech who put in the new batteries said to leave it off unless we want to watch the TV or use those plugs for other things when we are not hooked up to shore power. He also said we could let the batteries go down to 9 volts. From reading the forums some people say that at 12 Volts you are at 50 percent other forums say the inverter charges the batteries . Anyway I am totally confused . Can someone straighten me out.
Thanks Gloria
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05-06-2016, 09:27 PM
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#2
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Rivet Master
1986 31' Sovereign
Miami
, Florida
Join Date: Feb 2004
Posts: 3,137
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Okay, fair question.
The inverter simply takes 12 volts of direct current from your batteries and creates 120 volts alternating current (as found in your basic wall socket at home). This is useful for things like televisions, CD players and the like. Nowadays , it is a fairly efficient process.
Obviously, there is no need to do this if you are on shore power or running the generator.
I can't imagine why anyone would recommend running your batteries down to 9 volts unless they happen to sell batteries.
12.2 volts is as low as I go. With a four battery bank, you should have plenty of available power. Just remember that things like hair dryers and coffee makers are real power hogs while electronic stuff tend to be the opposite.
Mike
__________________
Sorta new (usually dirty) Nissan Titan XD (hardly paid for)
Middle-aged Safari SE
Young, lovely bride
Dismissive cat
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05-06-2016, 09:27 PM
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#3
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Rivet Master
1986 25' Sovereign
2008 F350, 6.4L diesel
, Oak Harbor, WA
Join Date: Sep 2015
Posts: 605
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Yes it is a good idea to leave it off, when you have more experience you may decide differently.
You do not want to go below 50% discharge, many folks add a monitor to help keep track of where that would be, depending on temperature that would be around 11.5 VDC.
To charge you would need to be on shore power.
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05-06-2016, 10:09 PM
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#4
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Rivet Master
2014 Interstate Ext. Coach
Sedona
, Arizona
Join Date: Jul 2008
Posts: 1,084
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I just don'the understand how the inverter works
If nothing else was changed, just the battery upgrade, then you have the standard Magnum inverter, which is a good one, but it can only provide 1000 watts of AC (110 volts) power. So don't expect to be able to run a hairdryer or electric heater or microwave or air conditioning from battery power. If that's required, start the generator or plug into shore power.
Never allow the batteries to be discharged below 50%. You solar monitor will display an approximate battery percentage.
It's also worth noting that the Magnum inverter also acts as a converter to provide 12 volts to the coach and batteries when hooked up to shore power.
The Magnum's invert mode should usually be turned off when not in use since it causes the batteries to be needlessly discharged faster.
If you have more questions, ask away, it's no trouble!
Update: Incidentally, upgrading to 4 batteries is an excellent idea for boondocking and I suspect the tech who installed it probably knew what he was doing, just there was some misunderstanding. But you still need to look after those new batteries. When not using the Interstate, try to keep it plugged into shore power since that Magnum is a smart charger and this can help to prolong the life of the batteries.
Sent from my iPad using Airstream Forums
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05-06-2016, 11:06 PM
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#5
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Rivet Master
2012 25' FB Eddie Bauer
Vintage Kin Owner
Virginia Beach
, Virginia
Join Date: Sep 2004
Posts: 7,801
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Girl talk - electricity that is used to create HEAT uses a lot of current. If you're not plugged into the grid, you only have what is in your batteries. The inverter changes battery (12 volt) back to Alternating Current (120). Solar panels supply more charging (fuel) to the batteries.
LED lights are a breakthrough - they don't get hot to make light, so they use between 5 to 10% of what comparable incandescents used to use.
I can boondock for over a week with two batteries by - cooking with propane inside, or outside with charcoal
- air drying my hair after wrapping it tightly in a microfiber towel
- Using the fantastic fans and windows in liew of air conditioning
- running the fridge on propane
- running the water heater on propane
We were ALL newbies once. Any time you feel stupid go watch Robin Williams in "RV"... it's done for laughs, but the "first trip to the dump station" is familiar to lots of folks from first hand experience.
__________________
Today is a gift, that's why they call it the present.
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05-07-2016, 02:47 AM
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#6
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Rivet Master
2012 25' FB International
Trent Woods
, North Carolina
Join Date: May 2013
Posts: 3,120
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Gloria,
Glad you got the upgrade! Yes you should turn off the inverter function when you are not using it as it will be a drain on the batteries even with nothing plugged in to an AC power socket. This is especially important if you are boondocking.
As you saw in Charleston, the inverter powers the outlet your TV uses, as well as the one behind the drivers seat. The only thing you mentioned you want to use on AC was charging your phone so turn on the inverter to charge it and then turn it off.
Larry
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05-07-2016, 05:43 AM
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#7
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Figment of My Imagination
2012 Interstate Coach
From All Over
, More Than Anywhere Else
Join Date: Dec 2011
Posts: 10,868
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Don't forget, you have an on-board generator. Shore power is not your only battery charging option. A full tank of propane holds about 14 gallons, or about 60 pounds, of propane, and it only takes less than a gallon to run the generator for an hour.
But you have to run the generator while the batteries still have enough power left to start it. When my Interstate was new, I accidentally let the house batteries discharge too low to start the generator a couple of times while it was in storage.
Doubling your batteries doubles your rated amp-hours from about 160 to about 320. But because you want to keep them above a 50% charge state, that means you can only use 160 amp-hours before you need to recharge.
There are only two built-in appliances that you cannot run at all off the inverter using battery power— the air conditioner and the microwave. Those two devices are on circuits that can only be powered by shore power or generator.
If you still have the stock solar panel setup, it only has a 100-watt panel— older ones like mine only came with a 50-watt panel, but customer complaints prompted Airstream to install a larger panel in later models. But it's still not enough to keep your house batteries charged while boondocking. My rule of thumb— based on the relationship between amps, watts, and volts— is that you need at least as many watts of solar panel as you have amp-hours of house batteries in order to recharge your batteries on a daily basis using solar alone. Now that you have 320 amp-hours of batteries, that means about 400 watts of solar panel. As far as I know, four 100-watt panels is the most anyone has ever managed to install on an Interstate due to the roof size. So when you're boondocking, plan on firing up the generator every couple of days for an hour or two in order to keep your batteries at a healthy charge state.
__________________
I thought getting old would take longer!
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05-07-2016, 11:18 AM
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#8
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Prairie Schooner
2005 25' Safari
Whidbey Island
, Washington
Join Date: Jan 2016
Posts: 43
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Like previous posts stated, never, ever let your batteries drain below 12 volts. beyond that permanent damage to the batteries can occur. I used a See Level monitoring system to keep tabs on my tank and battery levels. I kept a chart, similar to the attached, taped nearby as a reminder.
Back to inverter issue, any consumer of household current (what your inverter converts 12v DC into) that creates heat or runs a motor will drain batteries very quickly. A microwave oven for example, will drain a battery in seconds. In contrast, modern flat screen TV's consume something on the order of a standard light bulb.
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05-07-2016, 12:57 PM
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#9
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Rivet Master
Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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I just don'the understand how the inverter works
9 votes.....huh?
I think the tech needs to go back to school for some more in-depth training specifically in 12VDC battery systems.
Every time you draw your batteries below 50%, you are effectively shortening their useful life by reducing the number if charge cycles they will accept.
Don't worry about the 'transient' voltage drop that you see while the inverter is in operation. It's the resting voltage after use that counts.
Lew Farber
RVIA/RVDA Nationally Certified Master Tech
ABYC Certified Master Marine Electrician
Master Tech Energy Systems, Inc.
AM Solar Certified Installation Center*AMS Lithium Batteries
Lifeline AGM Batteries**Magnum Inverters***Victron Energy Components
541-490-6357
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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05-07-2016, 12:59 PM
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#10
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Retired.
Currently Looking...
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, At Large
Join Date: Jun 2003
Posts: 21,276
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Quote:
Originally Posted by lewster
9 votes.....huh?
I think the tech needs to go back to school for some more in-depth training specifically in 12VDC battery systems.
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Yeah, 9 volts is, well, dead...
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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05-07-2016, 01:49 PM
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#11
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Rivet Master
2014 27' FB Eddie Bauer
Chelsea
, Michigan
Join Date: May 2010
Posts: 1,792
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Quote:
Originally Posted by overlander63
Yeah, 9 volts is, well, dead...
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I wonder how you could get your batteries down to 9 volts? Certainly any small fan motor or electronic board (i.e., fridge) would have quit by the time you got anywhere near that low and the lights, well, they would be like a very dim candles which would be a signal that something was going very wrong!
I would avoid that particular person at all costs in the future. Obviously he doesn't know his a$$ from a hole in the ground.
__________________
Bob Martel
WBCCI# 5766
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05-07-2016, 04:43 PM
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#12
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3 Rivet Member
2015 Interstate Ext. Coach
Tega Cay
, South Carolina
Join Date: Jan 2015
Posts: 135
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Thank you all for the information. It has helped clear up a lot of questions. I will keep tabs on the percent used with my solar monitor and not go below 12.1 volts. We do keep the unit hooked up to shore power when at home and in campgrounds that have electric. We are presently on the was to the Grand Canyon and Utah and will do our first Boondocking.
Gloria
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05-07-2016, 07:23 PM
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#13
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3 Rivet Member
2015 Interstate Ext. Coach
Tega Cay
, South Carolina
Join Date: Jan 2015
Posts: 135
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I have another question. I am in a campground for the night and I heard a fan blowing under the streetside seat in the back and and felt heat on the side of the seat. I lifted the seat and saw that this is where 2 of the batteries are. I don't ever remember this happening before, so I am a little concerned. Also, our neighbor said to run the inverter whenever I am plugged in as it charges the batteries? ?????
Gloria
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05-07-2016, 08:24 PM
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#14
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Rivet Master
Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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Quote:
Originally Posted by gghayes
I have another question. I am in a campground for the night and I heard a fan blowing under the streetside seat in the back and and felt heat on the side of the seat. I lifted the seat and saw that this is where 2 of the batteries are. I don't ever remember this happening before, so I am a little concerned. Also, our neighbor said to run the inverter whenever I am plugged in as it charges the batteries? ?????
Gloria
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Gloria, You have a Magnum inverter/charger in your Interstate.
You don't have to 'run the inverter' in order for the charging section to operate.
Any time your Magnum senses the presence of shore power, whether from the power post in a campground or from your on-board generator, it will automatically respond by activating the charging section of the unit.
'Running the inverter', or simply turning the inverter section of the unit 'on', will have no effect on the operation of the unit when shore power is present. Your Magnum will 'pass thru' the 120VAC that enters it to the 120VAC circuits that are connected to it and again, will automatically charge your batteries.
When you have no 120VAC coming into your coach from either power post or generator and you want to energize the circuits (mainly TV and an outlet or 2) that are connected to your inverter, it is then that you press the 'invert' button on your ME-RC remote control panel.
This will start producing 120VAC from your batteries to energize the 'inverter outlets'.
Tell your neighbor to either learn how RV components operate or shut up!!! Damaging advice is worse than no advice at all!!!
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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05-08-2016, 07:25 AM
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#15
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Rivet Master
2014 27' FB Eddie Bauer
Chelsea
, Michigan
Join Date: May 2010
Posts: 1,792
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I hear less-knowledgeable RV'ers use the terms "inverter" and "charger" interchangeably all the time. Your neighbor is probably in that category. I would probably not take and stock market tips from him or her either.
__________________
Bob Martel
WBCCI# 5766
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05-08-2016, 07:49 AM
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#16
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Full time Airstreamer
2014 30' FB FC Bunk
Anywhere
, USA Living.Somewhere.Yonder
Join Date: Jan 2014
Posts: 1,359
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Quote:
Originally Posted by gghayes
We just replaced the 2 batteries that came with our 2015 interstate with 4 batteries in order to so some boondocking. My question is when should we use the inverter . The tech who put in the new batteries said to leave it off unless we want to watch the TV or use those plugs for other things when we are not hooked up to shore power. He also said we could let the batteries go down to 9 volts. From reading the forums some people say that at 12 Volts you are at 50 percent other forums say the inverter charges the batteries . Anyway I am totally confused . Can someone straighten me out.
Thanks Gloria
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Is it possible he said 11.9? Not 9?
11.9 is more reasonable.
__________________
@living.somewhere.yonder | Instagram
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05-08-2016, 11:39 AM
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#17
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3 Rivet Member
2015 Interstate Ext. Coach
Tega Cay
, South Carolina
Join Date: Jan 2015
Posts: 135
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Thank-you thank you. I finally understand how the inverter works. You all are great. No, scottinnj, he definitely said 9.
Gloria
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05-09-2016, 06:43 AM
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#18
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2 Rivet Member
2015 22' FB Sport
Indianapolis
, Indiana
Join Date: Oct 2015
Posts: 60
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listening
One of the many things I love about Air Forum is all the knowledgeable people. I learn things I haven't even had to ask yet Ha Ha!
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05-09-2016, 07:06 AM
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#19
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1 Rivet Member
San Diego
, California
Join Date: Mar 2016
Posts: 16
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50%?
(Tongue in Cheek - to illustrate a point):
Wait - I can discharge my battery 50% before damaging it - isn't that SIX (6) volts???
I am confused!
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01-30-2019, 09:01 AM
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#20
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Streaming Outlander
2019 27' International
Airstream - Other
Currently Looking...
Phoenix
, Arizona
Join Date: Jan 2019
Posts: 22
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Alarm for low battery?
Is there an device (iOS would be nice if away from rhe AS) to alert us when battery levels get below the half way point? Suggested products? Thanks!
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