Re: [EVDL] Upgraded heater
I installed two cores from some ceramic heaters purchased at Lowes for $21 each several years ago. Before installing I measured output of one heater plugged into the wall with its fan on “high” as 1460W. Resistance of the two heaters in parallel was 11 Ohm at room temperature of about 85 F, and after heating with a heat gun briefly, 5 Ohm. After installing the heater cores and putting everything back together I tested the heat output. I measured current into the heaters with an Extek EX830 meter. The pack was at about 44% SOC, and 116V. With blower on high: 27.2A, 116V, 3155W, blower on medium: 26.2A, 116V, 3039W, blower on low: 24.8A, 116V, 2877W. Possibly your cores are different resistance, leading to unequal currents through them, assuming they are wired in parallel so you have full voltage across each. -- View this message in context: http://electric-vehicle-discussion-list.413529.n4.nabble.com/Upgraded-heater-tp4679378p4679395.html Sent from the Electric Vehicle Discussion List mailing list archive at Nabble.com. ___ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
[EVDL] Upgraded heater
I just upgraded the heater in my truck from a single ceramic core (nominal 1500W) to 2 of them. Measurements show that I'm getting about 2000W of heat total when the fan is on hi. Even though each core is wired for 240 VAC, and I'm driving it with 327VDC. Wonder if these actually draw 1500W when plugged into AC? (too much of a PITA to check mine now.) -- Worlds only All Electric F-250 truck! http://john.casadelgato.com/Electric-Vehicles/1995-Ford-F-250 ___ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
Re: [EVDL] Upgraded heater
On Mon Dec 28 20:22:42 PST 2015 ev@lists.evdl.org said: >Either only one core is passing the electric current >or the air flow is not sufficient to avoid the heaters >to reach the temp where they increase in resistance enough >to self-limit the power (so they don't burn up) > >Can you see / check the two elements to see if they both >pass current? If so, then the air flow must be increased to >get higher output (and lower the heater core temp, so they >will draw higher current). They are both drawing current, and the trucks blower is putting out considerably more air than the original heater fan. I'd go with Lee's observation that it's likely they never really drew 1500W when plugged into AC in the first place. And yes, I did notice that they draw significantly more for the first few seconds. -- Try my Sensible Email package! https://sourceforge.net/projects/sensibleemail/ ___ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
Re: [EVDL] Upgraded heater
John Lussmyer via EV wrote: I just upgraded the heater in my truck from a single ceramic core (nominal 1500W) to 2 of them. Measurements show that I'm getting about 2000W of heat total when the fan is on hi. Even though each core is wired for 240 VAC, and I'm driving it with 327VDC. Wonder if these actually draw 1500W when plugged into AC? (too much of a PITA to check mine now.) The actual power consumption (and thus heat produced) by these ceramic elements depends *strongly* on the airflow through them. More airflow = lower resistance = more heat. I have found that most commercial heaters that use these elements have weak fans, and thus don't provide nearly as much heat (nor draw as much wattage) as claimed, except for a very brief time as the are first warming up. -- The prime instinct of children at play is to build and to create. They will make things of whatever materials are at hand, and use the whole force of dream and fancy to create something out of nothing. -- Alfred P. Morgan -- Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com ___ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
Re: [EVDL] Upgraded heater
Hi John, Either only one core is passing the electric current or the air flow is not sufficient to avoid the heaters to reach the temp where they increase in resistance enough to self-limit the power (so they don't burn up) Can you see / check the two elements to see if they both pass current? If so, then the air flow must be increased to get higher output (and lower the heater core temp, so they will draw higher current). Success! Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626Skype: cor_van_de_water XoIP +31 87 784 1130private: cvandewater.info http://www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -Original Message- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of John Lussmyer via EV Sent: Monday, December 28, 2015 11:47 AM To: Electric Vehicle Discussion List Subject: [EVDL] Upgraded heater I just upgraded the heater in my truck from a single ceramic core (nominal 1500W) to 2 of them. Measurements show that I'm getting about 2000W of heat total when the fan is on hi. Even though each core is wired for 240 VAC, and I'm driving it with 327VDC. Wonder if these actually draw 1500W when plugged into AC? (too much of a PITA to check mine now.) -- Worlds only All Electric F-250 truck! http://john.casadelgato.com/Electric-Vehicles/1995-Ford-F-250 ___ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) ___ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
