[RE-wrenches] EG4 GridBOSS Generator Exercise

[jay]

what generator do you have?

jay

> On Apr 7, 2026, at 1:25 PM, Jason Szumlanski via RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:
> 
> Here we go again with a manufacturer providing poor and misleading documentation. The EG4 GridBOSS manual says:
> 
> The GridBOSS should use start/stop relay 1 in the normally open connection. Start/stop relay 1 can be controlled manually or by battery SOC/voltage logic within the EG4® Monitor Center. The generator can also be configured with warm-up, cool-down, and exercise time.
> 
> I just learned that there is, in fact, no automatic scheduled generator exercise feature on the GridBOSS. This is a real problem because many generator controls disable the onboard exercise function when remote-start capability is enabled. 
> 
> So what is "exercise time" in EG4's world? Apparently, that means you can set a duration for the generator to run when you MANUALLY start the generator from the app. 
> 
> Hope this saves someone else a big headache, hours of research, and clueless tech support.
> 
> Any thoughts on a simple external relay in parallel to accomplish this function? I was thinking about a Shelly connected to a smart load for power in the GridBOSS. It just needs to be a programmable relay to close on a schedule. How reliable are Shelly relays for scheduled tasks?
> 
> 
> Jason Szumlanski
> Principal Solar Designer | Florida Solar Design Group
> NABCEP Certified Solar Professional (PVIP)
> Florida State Certified Solar Contractor CVC56956
> Florida Certified Electrical Contractor EC13013208
>   
> 
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