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

[Dave]

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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