We used waterbed heaters under the packs in the Silver Bullet without any issues for more than 4 years, setting 8 consecutive records. Found them to be very durable. Not sure that I would place the same amount of faith in a electric blanket, as the conductors are not very well protected under the fabric. As for running the heater from batteries, I am of the opinion that we only needed to heat the pack during storage and prior to the first run down the track ( the hard discharge and quick recharge warms things up pretty quick!). After we reached 100 degrees F, the issue rapidly became one of cooling (dry ice + fans were fairly effective). Keep up the great work!
-Tom On Jun 4, 2016 10:24 AM, "paul dove via EV" <ev@lists.evdl.org> wrote: > There are different requirements for blankets sold in the USA. They must > be low power compared to the ones sold in other countries. > > From: Bobby Keeland via EV <ev@lists.evdl.org> > To: Electric Vehicle Discussion List <ev@lists.evdl.org>; John Lindsay < > johnslind...@mac.com> > Sent: Saturday, June 4, 2016 8:27 AM > Subject: Re: [EVDL] Modified Sine Wave Heating > > I used an electric blanket under a water bed through an entire winter. > It worked fine while turned on the entire time. > > Under a bunch of batteries in a moving vehicle I would not trust. > Bob Keeland > On Jun 4, 2016 7:48 AM, "John Lindsay via EV" <ev@lists.evdl.org> wrote: > > We use them under people in Australia. Not recommended to be left on when > you're in bed but folks do. > > John Lindsay > > > On 4 Jun 2016, at 9:32 PM, EVDL Administrator via EV <ev@lists.evdl.org> > wrote: > > > >> On 3 Jun 2016 at 22:39, Bill Dennis via EV wrote: > >> > >> I've see Lee Hart's description of using an electric blanket under a > battery > >> pack for heating. Does anyone know if the controllers for these > blankets will > >> work with a modified sine wave inverter? That is, if the blanket's > little > >> control unit that allows you do adjust the heat setting and has an > automatic > >> shut-off timer will work if powered by a modified sine wave inverter. > > > > Not that I mean to answer for Lee, but - maybe. > > > > One issue that should be OK - assuming that the thermostat is a > traditional > > mechanical type - is its ability to handle your inverter's output wave. > > > > "Modified sine wave" inverters should really be called "modified square > > wave" because they're closer to that. But the wave still crosses zero > volts > > 120 times a second. That's what you need for the thermostat to manage > > opening without welding its contacts, which is what would probably happen > if > > you tried to use it on DC. > > > > If the blanket has some kind of electronic controller, instead of a > > mechanical thermostat, then I don't know. > > > > I have some other concerns. One problem I see is that an electric > blanket > > thermostat responds to room air temperature. It cycles on and off every > few > > minutes or so (coarse PWM), with more on-time as the room temperature > falls. > > Seems to me that it'd be tough to make it hold a consistent battery > > temperature, since it wouldn't be able to sense the actual battery > > temperature. > > > > Also, the thermostat isn't designed for automotive use, where it might be > > exposed to the elements and lots of vibration. > > > > Finally, I'd be concerned that an electric blanket isn't designed to have > > weight on it, it's meant to be placed OVER a person. > > > > David Roden - Akron, Ohio, USA > > EVDL Administrator > > > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > EVDL Information: http://www.evdl.org/help/ > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > Note: mail sent to "evpost" and "etpost" addresses will not > > reach me. 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