Hi Buddy, Why not run your heaters from the main pack voltage rather than changing the voltage twice.
I use 2kW 220vac ceramic heater cores taken out of cheap fan heaters. They are about 4" square and supposedly very safe as the resistance rises with temperature so they never reach an unsafe temperature even if the fan stops.(Positive temperature coefficient) My cores are running on a 320v nominal voltage which can be over 340v when charged but have been working for years trouble free. I set them in the original heater matrix with the matrix cores cut out and fixed them with araldite. A simple air flow switch made from a float switch only allows heat when the fan is running for extra safety. You could string two 110v ones in series if 220v cores are not available in the US or Ebay from Europe. Use a high voltage relay to control them on and off. I use a high voltage DC semiconductor relay for temperature control using a cycling timer. It wasn't cheap but handles fast pulses better than a relay. Russ www.evalbum.com/1454 Lotus Elise EV Vortex GTEV Ride on lawnmower EV -------------------------------------------- On Fri, 29/8/14, Buddy Mills via EV <ev@lists.evdl.org> wrote: Subject: [EVDL] DC2DC times 2 To: "'Electric Vehicle Discussion List'" <ev@lists.evdl.org> Date: Friday, 29 August, 2014, 1:46 I need some help with spec(s) on a filter diode. I am attempting to hook up two DC to DC in my car along with a battery for my Aux 12volts. Yes, I know that seems excessive but I need the extra to run my 12dc to 110vac inverter that runs my heaters. It has been recommended here on the list serve that I place a diode on the output as to not give feedback to either of the DC2DC. My problem is I don't know what specifications I need to use. Plus if someone could also tell where I could purchase it I would be most appreciated. I know that there are quite a few of you on the list that would probably know this off the top of their head. Here is some info that I know. Battery is a Durcel AGM SL34M (20 amp hour rate - 55, Reserve Capacity:120 DC2DC #1 Zivan NG1 - 50amps DC2DC #2 Azure DC-DC750 - 56amps DC2AC inverter Cobra 2575 - 2500watts cont. - 5000watt peak 110vac - 1500 watt Heater Thanks for your assistance, Buddy Mills buddymi...@cox.net Look mom, no gas. http://www.evalbum.com/2887 Disclaimer: No animals were harmed or killed in the process of writing this email. Any stories to the contrary are, for the most part, either fictional or greatly exaggerated. _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use 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 For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
