[RE-wrenches] Diversion load for AC coupled system

[Kent Osterberg]

Larry,

I think Magnum's recommendation is more about proper battery charging 
than safety.

I'll second Kirpal's and Jeremy's recommendations for loads. The Tristar 
is probably the best choice for this job, but you are overestimating 
what you can do with it and paralleling two may have some coordination 
issues. The Tristar 60 manual says to keep diversion loads below 45 amps 
(or somewhere close to that). I think its a reliability issue so with a 
secondary shut down method, you might be okay pushing it a bit. I'm not 
sure how you get two of them to work together.

Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882


On 11/29/2011 5:35 PM, Larry Crutcher, Starlight Solar Power Systems wrote:
> Hello Wrenches,
>
> I would like some advice on diversion load control of 3800 watts of PV solar. The battery bank is 48 volts and the battery inverter is the MS4448PAE. This will AC couple with a grid tied inverter during an outage. Magnum Energy recommends the addition of a dump load for safe battery voltage control.  The customer may leave the home unattended for weeks so I am looking for reliability here. Quality, as well.
>
> A pair of Tristar 60's should be suitable for the 3.8kW output but I haven't been able to find a load that is sized for this job. I welcome any advice on this subject.  Thanks in advance.
>
> Larry Crutcher
> Starlight Solar Power Systems
> _______________________________________________
>