jray3
Posts: 1439
Joined: Tue Dec 06, 2011 1:05 am
Location: Tacoma area, WA
Contact: Website

Re: Why not a RoadPro heater?

Fri Oct 27, 2017 8:06 am

magellan wrote:I'm looking at this for the windshield
http://www.bimmerworld.com/Safety-Race- ... w0QAvD_BwE


I like that idea. :idea: Please advise on its success and how much power it draws (or at least what size fuse it uses).
2012 i-SE "MR BEAN" 84,000 miles, 37 Ah
2012 i-ES traded at 21,648 miles
1983 Grumman Kurbwatt,170 kW, 32 kWh
1983 Mazda RX-7 EV 43 kW 10 kWh
1971 "Karmann Eclectric" EV 240 kW 19 kWh
1965 Karmann Ghia Cabriolet

justoneman
Posts: 91
Joined: Sun Apr 09, 2017 6:09 pm

Re: Why not a RoadPro heater?

Tue Dec 26, 2017 7:58 pm

I was charged with the duty to report back on the performance of my RoadPro 12v heater. Since Chicago is well into winter I have some things to say about it. Late in the Autumn I used my RoadPro more as test runs to see how it would do. Temps ranged from ranged from 45F to 32F. I tried several different combination in this time period. I tried just RoadPro no heated seat and no car heat. The Road pro kept me a little bit warm but not completely comfortable. I tried it with the electric seat and found that my feet were a little cold but all else fine. I then tried it with the RoadPro actually down by my feet on the driver side and it warmed my feet fine. But there is not much room down there for the big heater box. But the best in late Autumn was to warm the cabin up with the car heater and then turn it off and maintain with the electric seat warmer and the RoadPro. Great for Autumn.

Next it has been winter weather 32F to 18F. Here the car heater needs to be employed to warm the cabin along with the seat warmer. I turn it on for 5 mins and off for 10 mins. The RoadPro certainly slows down the cabin cooling. Were I not using the RoadPro it would very quickly get cold. Does it heat the car up by itself? Certainly not but it is definitely extending the range of the car because I can have the heat off 2/3 of the time.

Today it was 0 degrees out. I did not drive my Imiev to word. I chickened out :) I feel that in this very low temp, I would need to run the heat the whole time. my drive to work is 30 miles and so with 100% heat on I would be close to complete battery use. I will wait for slightly warmer temps later this week and see how it does in the 10F to 18F weather.

Over all I think the idea of the isolated 12v battery pack just for the 12v heater extends the range by 5 to 12 miles in Winter.

Don
Site Moderator
Posts: 2574
Joined: Thu May 10, 2012 3:55 pm
Location: Biloxi MS

Re: Why not a RoadPro heater?

Tue Dec 26, 2017 8:12 pm

justoneman wrote:Over all I think the idea of the isolated 12v battery pack just for the 12v heater extends the range by 5 to 12 miles in Winter.
Thanks for your observations. If it keeps you from using the car heater, it's gotta be extending your range more than 5 or 10 miles

But, the question remains, does it provide enough heat to make a comfortable trip in cold temps? If you preheat the car using the remote and then run the Road Pro full blast to keep it from cooling off as quickly as it otherwise would, I'm guessing it's fairly practical for the ride to work - How long will the 12 volt battery run it? If you can't plug in at work and preheat for the trip home, you better hope you have enough juice to run the car heater

Is it worth the expense of buying the heater and $100 to $125 for a deep cycle battery to run it? 2 heaters and 2 batteries?

Don
2012 iMiEV SE Premium, White
2012 iMiEV SE, White
2017 Chevy Volt Premier
2014 Ford Transit Connect XLT SWB wagon, 14,000 miles
1979 Honda CBX six into six

justoneman
Posts: 91
Joined: Sun Apr 09, 2017 6:09 pm

Re: Why not a RoadPro heater?

Tue Dec 26, 2017 9:08 pm

Don wrote:
justoneman wrote:Over all I think the idea of the isolated 12v battery pack just for the 12v heater extends the range by 5 to 12 miles in Winter.
Thanks for your observations. If it keeps you from using the car heater, it's gotta be extending your range more than 5 or 10 miles

But, the question remains, does it provide enough heat to make a comfortable trip in cold temps? If you preheat the car using the remote and then run the Road Pro full blast to keep it from cooling off as quickly as it otherwise would, I'm guessing it's fairly practical for the ride to work - How long will the 12 volt battery run it? If you can't plug in at work and preheat for the trip home, you better hope you have enough juice to run the car heater

Is it worth the expense of buying the heater and $100 to $125 for a deep cycle battery to run it? 2 heaters and 2 batteries?

Don

Yes the 5-12 mile extension is in cold autumn weather. I have not really explored the uber cold weather use too much. I have run the heater 100% several times on the way to work on my 1 hour drive. Still having juice on the way home. I have not run it much on the way home because it would not be so good to drain the battery.

Its a good point about why not two batteries and even two heaters. I would say two would heat the car up in average winter weather.

I bought my gel cell used and the road pro I was luck to get a used one that was never taken out of the box. All still in plastic wrap inside. My whole set up was $100 total.

justoneman
Posts: 91
Joined: Sun Apr 09, 2017 6:09 pm

Re: Why not a RoadPro heater?

Wed Jan 03, 2018 7:25 pm

With the cold blast that the Midwest is experiencing, I have a full range of use of the 12v heater. It is still effective down to just below freezing but the effectiveness quickly is diminished as the temps drop down. At 20 degrees there is still reasonably warm air coming out. At 10 degrees it is only a little bit warm. At 0 degrees temperature outside, there is really no warmth to be felt coming from the unit.

Frankly at temps of 10 degrees and lower even the cars heating system does not heat the car up very well. The car does not have a very effective heating system. Perhaps if the car's heater real got the cabin toasty hot, the little 12v RoadPro might be effective at helping to maintain the cars ambient heat.

jray3
Posts: 1439
Joined: Tue Dec 06, 2011 1:05 am
Location: Tacoma area, WA
Contact: Website

Re: Why not a RoadPro heater?

Thu Jan 04, 2018 1:04 pm

I've just started using a conventional small ceramic element forced air heater to preheat my old RX-7 EV conversion. It was a pain to tiptoe from bed to car or the extension cord, so I've added a wifi-connected smart switch. https://www.amazon.com/gp/product/B077CZ24JQ/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
The little wifi relay has a simple app that reports Wattage, Amperage, Voltage, and historical consumption, and is working great for heating both on demand and by daily schedule. It was also useful to spot that my old extension cord consumes almost 100 Watts after warming up.
2012 i-SE "MR BEAN" 84,000 miles, 37 Ah
2012 i-ES traded at 21,648 miles
1983 Grumman Kurbwatt,170 kW, 32 kWh
1983 Mazda RX-7 EV 43 kW 10 kWh
1971 "Karmann Eclectric" EV 240 kW 19 kWh
1965 Karmann Ghia Cabriolet

Don
Site Moderator
Posts: 2574
Joined: Thu May 10, 2012 3:55 pm
Location: Biloxi MS

Re: Why not a RoadPro heater?

Thu Jan 04, 2018 3:52 pm

jray3 wrote:It was also useful to spot that my old extension cord consumes almost 100 Watts after warming up.
I have a 13 amp vacuum cleaner with what I swear must be an 18/2 cord on it which is about 20 feet long - It has an 'auto reel up' function on it and they do warn you to always pull it all the way out before using the vacuum. Even then, I can feel the cord heat up in my hand when it's running. I'll *bet* the cord is consuming close to 500 watts on that thing!!!

Don
2012 iMiEV SE Premium, White
2012 iMiEV SE, White
2017 Chevy Volt Premier
2014 Ford Transit Connect XLT SWB wagon, 14,000 miles
1979 Honda CBX six into six

JoeS
Site Moderator
Posts: 3381
Joined: Thu Dec 15, 2011 5:47 am
Location: Los Altos Hills, California

Re: Why not a RoadPro heater?

Thu Jan 04, 2018 5:11 pm

Don wrote:
jray3 wrote:It was also useful to spot that my old extension cord consumes almost 100 Watts after warming up.
I have a 13 amp vacuum cleaner with what I swear must be an 18/2 cord on it which is about 20 feet long - It has an 'auto reel up' function on it and they do warn you to always pull it all the way out before using the vacuum. Even then, I can feel the cord heat up in my hand when it's running. I'll *bet* the cord is consuming close to 500 watts on that thing!!!
#18AWG ==> .006385 ohms/ft
2 * 20'* .006385 = 0.2554 ohms
13A * 13A * 0.2554Ω = 43.2W
What's an order of magnitude amongst friends? :geek: :lol:

Yes, I've always been shocked (pun intended) by what manufacturers can get away with then it's considered intermittent-duty.

jray3, what a great gadget! I'm ordering a couple. Thanks.
EVs: 2 Wht/Blu SE Prem., '13 Tesla MS85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV

jray3
Posts: 1439
Joined: Tue Dec 06, 2011 1:05 am
Location: Tacoma area, WA
Contact: Website

Re: Why not a RoadPro heater?

Fri Jan 05, 2018 11:40 am

jray3 wrote:
magellan wrote:I'm looking at this for the windshield
http://www.bimmerworld.com/Safety-Race- ... w0QAvD_BwE


I like that idea. :idea: Please advise on its success and how much power it draws (or at least what size fuse it uses).


I think I've found the supplier to Bimmer World, who of course offers a wider variety at lower prices. I'm eager to try it, but ought to replace MR BEAN's cracked windshield first!
https://www.frostfighter.com/index.htm
2012 i-SE "MR BEAN" 84,000 miles, 37 Ah
2012 i-ES traded at 21,648 miles
1983 Grumman Kurbwatt,170 kW, 32 kWh
1983 Mazda RX-7 EV 43 kW 10 kWh
1971 "Karmann Eclectric" EV 240 kW 19 kWh
1965 Karmann Ghia Cabriolet

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