48 volts is a consideration and I have done many, but the problem is still the 26 AC watt load and the inverters efficiency at that light a load. Just hate to burn that much DC to generate that little AC. I am unsure if it is better at 48 volts or not.
Maybe I should not sweat it but it just bugs me. It probably comes from years of looking at "E meters" and playing with loads. Bob From: [email protected] [mailto:[email protected]] On Behalf Of Allan Sindelar Sent: Wednesday, May 12, 2010 2:09 AM To: RE-wrenches Subject: Re: [RE-wrenches] Tiny load problem Bob, If I step back and look at your question, another bigger question comes up: if you are designing a system with two inverters in order to double charging current, you must have a pretty good sized battery bank. In general, I would suggest that you look at a 48V system, rather than 24V, once it gets to that size. Equivalent charging rate, but smaller wire, lower component amperage requirements and fewer battery strings to get the capacity you're apparently looking for. Allan Sindelar <mailto:[email protected]> [email protected] NABCEP Certified Photovoltaic Installer EE98J Journeyman Electrician Positive Energy, Inc. 3201 Calle Marie Santa Fe, New Mexico 87507 505 424-1112 <http://www.positiveenergysolar.com/> www.positiveenergysolar.com Phil Undercuffler wrote: If the normal connected loads are within the capacity of a single inverter (which may actually be possible -- I run my whole house off one Outback FX2024, microwave, dishwasher, washing machine and all) then you can just leave one of the inverters in sleep mode or disable output but leave input/charging enabled. Which inverters are you planning on using for the generator charging? Depending upon which brand or how sophisticated you want to be, there are a couple ways to skin this cat. Easiest and cheapest is to simply not connect up any AC output wiring or stacking cables to the second inverter, and program it to stay asleep and charge only when it sees AC input power. I used to be religious about making sure my inverter was asleep, and even had a second baby inverter to power a handful of full time or sensitive loads. However, it got difficult trying to explain why you couldn't just plug the vacuum cleaner into just-any-old-outlet, and as my electronic widget count expanded it became less and less advantageous to have that baby inverter. Phil Undercuffler Conergy On Tue, May 11, 2010 at 9:58 AM, bob < <mailto:[email protected]> [email protected]> wrote: I am sizing a system that will have dual inverters to shorten generator charging in the winter and enough solar to charge the rest of the time. Here's the problem, the inverter will not be able to get into sleep mode at night. There are 2 cell chargers and a "cpap" machine having to run all night. It only totals 26 watts, has anyone found a better way to do this without having to keep an inverter awake to produce 26 watts? I would like to dedicate a Morningstar 300 watt inverter for the job but the system is 24 volts and Morningstar has no plans to make one in 24 volts. Anyone got any other ideas, or am I best to just deal with it? Thanks, Bob _______________________________________________ List sponsored by Home Power magazine List Address: <mailto:[email protected]> [email protected] Options & settings: <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: <http://www.re-wrenches.org/etiquette.htm> www.re-wrenches.org/etiquette.htm Check out participant bios: <http://www.members.re-wrenches.org> www.members.re-wrenches.org _____ _______________________________________________ List sponsored by Home Power magazine List Address: <mailto:[email protected]> [email protected] Options & settings: <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: <http://www.re-wrenches.org/etiquette.htm> www.re-wrenches.org/etiquette.htm Check out participant bios: <http://www.members.re-wrenches.org> www.members.re-wrenches.org
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