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 Professional^TM : Cert #031508-90
NABCEP Certified Solar Heating Installer^TM : Cert #SH031409-13
*From:*RE-wrenches [mailto:re-wrenches-boun...@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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