Darryl, see my post yesterday (I think). If you have the tonnage and the SEER/EER you know the operating current, period.
As for start up transient, I think we need to get help from someone who has actually measured the transient (I think I saw a post about that a couple of days ago?). And, when comparing the surge current with an inverter capacity, make sure you get the compliance voltage. An inverter that is rated at 25 A steady state, but claims to provide 40A for 4 sec, will do you no good if the voltage drops to 150 VAC while providing the 40A! - Peter Peter T. Parrish [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Darryl Thayer Sent: Friday, August 22, 2008 2:30 PM To: RE-wrenches Subject: Re: [RE-wrenches] offgrid system question I use for a short cut 1 AC ton is 1 HP mechanical or 1kW electrical. So If I have a 3 ton heat pump I figure the compressor is about a 1 horse power motor and about 1 kW running load. If that is 240 volts that is about 4 0r 5 amps. Because I have had some starting problems, I say that the running amps times 10 are the start amps, so this unit should have inverter capable of starting 40 amps Surge. If the SEER is higher than 12 it will start comiing down, but I do not know for inverter sizing If you are doing and energy anaylsis you would want better numbers from your AC manufacturer. The 9000 watts for 2.5 tons is to high. Darryl --- On Fri, 8/22/08, jay peltz <[EMAIL PROTECTED]> wrote: > From: jay peltz <[EMAIL PROTECTED]> > Subject: Re: [RE-wrenches] offgrid system question > To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org> > Date: Friday, August 22, 2008, 9:23 AM > Can someone tell me how to convert AC "tons" to > rough electrical load? > or is there a way? > > I've got a customer who is wanting to install a AC unit > and they tell > me its a 2.5 ton and uses 9000 watts. > ( they haven't given me make or model yet) > > thanks, > jay > > _______________________________________________ > List sponsored by Home Power magazine > > RE-wrenches@lists.re-wrenches.org > > http://lists.re-wrenches.org/listinfo.cgi/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org _______________________________________________ List sponsored by Home Power magazine RE-wrenches@lists.re-wrenches.org http://lists.re-wrenches.org/listinfo.cgi/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org _______________________________________________ List sponsored by Home Power magazine RE-wrenches@lists.re-wrenches.org http://lists.re-wrenches.org/listinfo.cgi/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org