Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×

Thread Tools Search this Thread Display Modes
Old 06-10-2020, 01:22 PM   #1
1 Rivet Member
1974 27' Overlander
Naramata , British Columbia
Join Date: Oct 2019
Posts: 11
Nova Kool DC only or AC/DC

Hello, All. We are pretty sure that we will be getting a Nova Kool R4500 fridge for our 74 Overlander project and we need to make a fairly quick decision. The DC-only model is less money than the AC/DC model that will automatically switch to shore power. My question (pls be kind because it may be a dumb one giving my limited understanding of all these "systems"!) is two-fold:

A. Doesn't an inverter/converter switch to AC power? Not sure why I would need another "switch" on the fridge itself?
B. That said, what should I be looking for and considering in choosing an inverter/converter?

Hopefully, you can weigh in with some clear and quick advice. Thanks!
Lonnajp is offline   Reply With Quote
Old 06-10-2020, 06:15 PM   #2
3 Rivet Member
SlvrTwinkie's Avatar
1976 29' Ambassador
Logansport , Indiana
Join Date: Feb 2019
Posts: 184
Images: 7
Blog Entries: 1
The inverter changes DC to AC, converter changes AC to DC. If you don't have one already you need the converter. To figure out what size you need , you will need to know how many amps everything on the DC side will pull. I don't know about an Overlander but my Ambassador came with a 75 amp converter. PO replaced it with a 65 amp converter, I think later I might put an 80 or 85 amp in. You might be able to get by with a 45 amp converter but I am not sure since I don't know how big the overlander is or how it is layed out. But that would be a starting point unless you can find documentation telling how big the factory converter was.

As for the fridge, I would go with the AC/DC fridge. The automatic switch over has nothing to do with the converter. But it would allow you to run a lower amp converter if you are on shore power the majority of the time cause it would be running on AC instead of Battery. If and when I have to replace our fridge I am going to go back with a 3-way fridge. That way if we are somewhere we do not have shore power I can run it on LP and save the battery for lights and furnace if needed.
SlvrTwinkie is offline   Reply With Quote
Old 06-10-2020, 11:23 PM   #3
1 Rivet Member
1974 27' Overlander
Naramata , British Columbia
Join Date: Oct 2019
Posts: 11
Okay.Thx for this explanation. We are working with a completely gutted trailer so we can go any direction with a new converter/inverter.
Lonnajp is offline   Reply With Quote
Old 06-11-2020, 05:31 AM   #4
Rivet Master
overlander63's Avatar
1993 21' Sovereign
Colfax , North Carolina
Join Date: Jun 2003
Posts: 21,252
I would get the DC version, unless your trailer is going to be permanently parked somewhere there is AC. You should always have DC of some kind, even if only from the tow vehicle, but you won't always have AC. I believe in KISS, and the less complexity, the less stuff to break.
overlander63 is offline   Reply With Quote
Old 06-11-2020, 11:02 AM   #5
1 Rivet Member
Currently Looking...
Nemo , South Dakota
Join Date: Sep 2007
Posts: 12
The Nova Kool will automatically switch between AC and DC based on availability. Whenever AC is/becomes available, the refrig will switch from DC. If the inverter/charger also has an automatic transfer switch as most do, then a switch-over from one current to the other will be totally seamless.

How much is this convenience worth?
clarklaflare is offline   Reply With Quote
Old 06-12-2020, 07:33 AM   #6
1 Rivet Member
1974 27' Overlander
Naramata , British Columbia
Join Date: Oct 2019
Posts: 11
Thx, All. We chose the AC/DC model for seamless switching. It was minimally more $ - the cost of convenience.
Lonnajp is offline   Reply With Quote
Old 06-12-2020, 09:13 AM   #7
2 Rivet Member
Bacliff , TX
Join Date: Dec 2019
Posts: 87
An ATS (automated transfer switch) is needed to seamlessly transfer from battery to shore. It may be in the inverter, maybe be in the fridge or maybe needed to installed separately.
A DC/AC is probably the best option. It depends on a lot of things. The fridge is usually the single biggest continuous draw of power you will have.
Remember 10 amps of AC = 100 amps DC. You will need to have enough charging ability to keep those batteries up. So you will likely need a generator or lots of solar (and lots of sunshine).
If you install FLAs (flooded lead acid) or VRLA (AGMs or Gels) batteries, you can only use 50% of rated capacity without battery damage - in otherwords 50Ah out of 100Ah battery. If you install lithiums you get up to 100% of capacity without battery damage (plus higher constant voltage and faster charging).
Do not make the mistake of undersizing your system for you needs. What you spend today will save you a lot of time, money and frustration in the future.
jimdelane is offline   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
Nova Kool anyone? byamcaravanner Refrigerators 11 08-26-2020 07:47 PM
2015 grand tour nova kool update southjk Sprinter and B-van Forum 45 02-26-2017 10:33 PM
Clarify Nova Kool kupchu9702 Sprinter and B-van Forum 2 07-27-2016 03:31 PM
Nova Kool 12V Operation tlundell Sprinter and B-van Forum 43 07-19-2016 02:39 PM
Drip Tray in Nova Kool Refrigerator BillyBoy Sprinter and B-van Forum 0 02-06-2016 07:34 AM

Featured Campgrounds

Reviews provided by


This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.

All times are GMT -6. The time now is 03:55 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.