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Author Topic: a bit about our symmetra rm  (Read 1516 times)
biff
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« on: April 03, 2011, 11:42:30 AM »

hi folks,
      a year or so ago,i installed a symmetra rm ups in our powerhouse. our batterybank is a minimum of 600ah x 120vdc,powered by a 2kw yangzhou shengzhou wind turbine.we are off grid and this turbine runs the house at least 80percent of the time.the turbine came with its own inverter and controller.the controller is the new digitall type and can also take 600watt solar.
 one of the problems running an inverter is matching the load to the turbine input on any given day,so,say your forcast is 3 to force 4,then the lowspeed blades are only going to pick up somewhere in the region of 400watts to 800watt,the chinese 2kw inverter supplied is the heavy transformer low frequency type,reliable but sore on juice at low speed ,so the idea was to find something that could maximise the energy coming in and prove less expensive amp wise to run.
    the symmetra comes with 3 battery modules and 4 power modules, the 4 power modules are stacked vertically to the right of the symmetra in removable drawers and the 3 battery modules are stacked vertically on the left,also in removable drawers.these both can be installed or removed when the ups is running under load and therein lies the attraction.
  our bank is externally connected by a large anderson to the rear of the symmetra,it was still necessary to leave one battery module live in the ups enable the brain to read the new battery set up and start up the ups, but once up and running this module can be removed and the ups relying totally on the external bank..(more to follow)..........biff
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An unpaid Navitron volunteer,who has been living off-grid,powered by wind and solar,each year better than the last one.
biff
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« Reply #1 on: April 03, 2011, 12:14:51 PM »

the get to know you period was extremely frustrating and after 24 hours of deliberating and pushing buttons the symmetra swung into action,it ticked all the boxs and had loads of power on tap,push one tray in and you had 1.4 kw ,push in another and you had 2.8 and so on,of course the more modules you pushed into place the more power it would consume to run itself,
 everything was hunky dory and the 8th of september arrived with the harvest fair,it was running on 2 modules supplying 2.8kw,one battery module was installed live and of course it was connected to the external bank.during our visit to the harvest fair the wind got up to a good force 8,we had no worries about our turbine and eventually arrived home to discover our controller was in a state of panic,even with all the loads on the house ac side the controller was fighting to hold its own,the digital clocks were reading 88888888s and it was too hot to even touch,i turned on a house fan and directed it at the controller bit by bit the figures began reappearing on the voltage clocks and the controller began to return to normal temp but the voltage was still too high,it did not take a genius to understand that the ups was recyling the charge back into the bank,the ups would bulk at 145volt but the controller was set to dump at 138 volt,so there was a serious problem.,for the time being the chinese inverter would still have to do the main work and the symmetra could only work under supervision, a few storms later i discovered that the simple way to prevent the symmetra from recycling the charge during a gale was to remove all the battery modules from the symmetra.this without doubt breaks the ups recyling charge connection to the external bank giving the turbine controller complete control over the voltage. a few storms later and we are beginning to relax. the symmetra provides massive information on every aspect of it work,it delivers exactly 50htz to the house and its electriclty is simply the best.everything works better.
                                                      biff
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