There are 12V elements, I think $100-200 buys a 12V/120V combo element. A 1500W/120V element, original equipment in a lot of marine water heaters, is ~10 ohms. At 72 volts this would be 7 amps X 72V or about 500Watts, at 48 V it is 48VX4.8A or about 250 Watts. The resistance may change slightly with temperature/voltage. Either would work. You might be able to find a 2000W/120V/~8ohm element. BUT, if you need to keep a dedicated 48 or 72V battery set and charger, that would seem to be the hard way to do it. If you had a solar array operating at 48 or 72 volts going to a MPPT controller, you could grab some power ahead of the controller, add about 30% to the "nominal" (multiple of 12V) voltage for the actual panel operating voltage. Lee ----- Original Message ----- From: [email protected] To: [email protected] Sent: Sunday, March 22, 2009 10:36 AM Subject: Re: [Liveaboard] Hot water heater
So if you had four or six batteries, how functional would using say 48 or 72 volts DC to heat the water? Or, does anyone make a heating element that would be sized appropriately for 12 volts? ------------------------------------------------------------------------------ Feeling the pinch at the grocery store? Make dinner for $10 or less. ------------------------------------------------------------------------------ _______________________________________________ Liveaboard mailing list [email protected] To adjust your membership settings over the web http://www.liveaboardnow.org/mailman/listinfo/liveaboard To subscribe send an email to [email protected] To unsubscribe send an email to [email protected] The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/ To search the archives http://www.mail-archive.com/[email protected] The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.0.238 / Virus Database: 270.11.22/2015 - Release Date: 03/20/09 19:01:00
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