Mark What you are saying is to AC couple but most likely this would fail as your battery fills not enough loads HBCO or to much loads and your battery does a LBCO, either way you would be better off spending the money in a maybe a Outback Skybox easy install and is high voltage PV input and even a small 48 volt bank but think about storage Jerry
On Sat, Feb 29, 2020 at 1:27 PM Mark Frye <ma...@berkeleysolar.com> wrote: > I have 2kw of grid tied PV on my house. > > Suppose I: > > - Open the main breaker to disconnect from the grid > > - I open the PV breaker > > - I connect a small good quality inverter like an Exeltech XP 500 to one > of the phases of the service (120 VAC) > > - I put a small battery pack, 100 AH at 24 VDC on the inverter > > OK so far, I could run some small loads for a relatively short period of > time before the batteries get low > > -I have a PLC with an AD input and DA output. On the input I measure the > battery voltage, on the output I control a SCR. The SCR controls a 2kw > immersion heater sitting in a big bucket of water. The PLC has a scan > time of 2 mS and I program it to increase the duty cycle of the SCR as > voltage of the battery rises above 24 VDC. > > OK so far nothing has really changed from above. > > - I close the PV breaker, the GT inverters see the battery inverter, > sync and connect after five minutes. > > Voila, I can run house loads from 0 to 2kw with my existing GT PV with > the balance of energy dumped as needed to the immersion heater. > > Right? > > Mark Frye > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > >
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