[RE-wrenches] RE; SW4024's were off grid, now on grid AC2 Controls?

[Bob-O Schultze]

Ray has it right but if he DOES try to sell back, make sure is electric meter is the old disc type. and not de-tented. You can tell if it is de-tented by observing it spin backwards on a sunny day. A de-tented meter will spin back just one revolution then a pawl releases and it spins back to where it started. Tell him NOT to try to sell into  digital meter. He is likely to get charged for his consumption AND his production.

On Dec 15, 2014, at 8:03 AM, Ray Walters wrote:

What you want is already programmed into the inverter.  It's called Low Battery Transfer mode (LBX), its just a program setting on the inverter.  You select this mode in Menu 9, and then its actual battery voltage settings are in Menu 16.
It will not sell back in this mode, but fromHome Power Magazine's Guerrilla Solar movement of the 90s, all you have to do to sell back: "Don't ask, Don't Tell, just press Sell".
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer, 
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 12/15/2014 8:09 AM, Daniel Young wrote:
> The way I would do this if using outback (really what I’m familiar with) is to set up the aux relay on the inverter to trigger an AC relay that connected the grid to the inverters ac input using the “load shed” function. It would trigger the relay when the batteries reached a set voltage (user programmable in the outback), then disconnect the grid at higher set voltage. Ex: activate relay at 46V, then de-activate relay at 50V (48V system). All you are basically doing is activating a charging source instead of severing a load to help the battery state of charge. Not sure how the trace handles AC1 and AC2, so maybe you’d need a second relay to make sure the generator input is always off when the grid input is active.
>  
> Not sure if the trace has this functionality. Hope this applies, or helps get you down the right path.
>  
> With Regards,
>  
> Daniel Young,
> NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90
> NABCEP Certified Solar Heating InstallerTM: Cert #SH031409-13
> From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Dave
> Sent: Sunday, December 14, 2014 8:10 PM
> To: 'RE-wrenches'
> Subject: [RE-wrenches] RE; SW4024's were off grid, now on grid AC2 Controls?
>  
> Here is a request for advice from one of my old off grid customers who has recently brought in the grid to lessen his dependence on the generator. He is NOT selling back to the grid.
>  
> The main question I have is this: Can we program the Trace SW4024 so that that it will charge the batteries with Grid Power (AC2) when a low voltage setting is reached?
>  
> << "I have two SW4024 inverters.  They are set up to each handle about 1/2 of the loads in the house.
>  
> Our system is setup so we are either on Grid power, or battery power. 
> The choice is controlled by a manual transfer switch.
>  
> AC1 on both inverters is backup generator which is controlled by Inverter #1 when battery voltage reaches preset levels.
>  
> AC2 on both inverters is AC from the grid and is currently controlled by circuit breakers.  The circuit breakers are normally in the off position and the batteries are charged by the sun.  Typically if we want to charge the batteries a bit with grid power we turn on the circuit breakers and the batteries are charged through both inverters by utility power.
>  
> What I would like to be able to do is set the inverter, probably inverter #1 for consistency, to allow grid charging at a set battery voltage and then cut off the grid when it reaches an upper voltage.  My thought is something along the lines of, if the batteries reach 40% of full charge Grid is started and allowed to charge batteries until they reach 80% charge.
>  
> I would like to continue as things are at present with the inverter triggering the back-up generator if needed.  Again my thought is at 35% of Full charge Generator is started and is then shut off at 80% of full charge.
>  
> My goal is to use PV juice as much as possible with first backup being Grid and second backup being Generator.  This should allow us to go away and hopefully run the house on PV but have two backups if needed". >>
>  
>  
> I would appreciate advice from anyone with experience with a system like this.
> Best,
> Dave
>  
> David Palumbo
> Independent Power LLC
> 462 Solar Way Drive
> Hyde Park, VT 05655
> 802-888-7194
>  
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