Hi Corey, Did you mount the SS relays to a good heat sink with heat compound? They are quite sensitive to heat damage and also like a lot things optimistically rated. I use a 2X oversize ratio for SS relays if they are used very much at all or for longer periods of time.
And I think you are correct to install a back up to the frequency shift that may or may not work. jay peltz power On Jul 31, 2013, at 11:24 AM, Corey Shalanski wrote: > Mac, > > We have installed about ten AC coupled Magnum systems over the past year. > > Overcharge protection is accomplished by frequency shift, but Magnum > recommends an auxiliary form of battery management. The cheapest way to do > this is to program the relay driver on the Magnum advanced remote control > (ARC) to open/close a solid state relay at specified battery voltage > setpoints - similar to what Kelly mentioned. Unfortunately the "cheapest way" > sometimes comes back to haunt us in the form of unanticipated extra costs. We > had two customer callbacks indicating their inverter had mysteriously shut > down - site visit revealed a fried relay in each case.. so I would recommend > at least investing in a good quality relay if you choose this route. > > One other thing we have learned is that not all grid interactive inverters > are compatible with the Magnum inverters. Specifically Power One Aurora > string inverters cannot seem to synchronize in off-grid mode - we have had to > switch out Auroras on two projects because of this. We have had no such > synchronization issues with SMA inverters so far. > > -- > Corey Shalanski > Joule Energy > New Orleans, LA > > _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: 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 List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
