Xantrex Technology SW Series Selling Power - Stored In The Batteries, Page, Operation, Legend

OPERATION

SELLING POWER - STORED IN THE BATTERIES

Power stored in the batteries can also be sold into the utility grid. This can be used together with the solar array or alone without a solar array. The inverter can be programmed to sell the energy in the batteries at a specific time and then to recharge the batteries at another time. Both the discharge level and discharge rate can be adjusted to control the battery selling process.

Selling the power stored in the batteries can be used to level the output of the combined solar array and battery system. This is beneficial during conditions of cloudy weather when the solar array output will vary with each cloud that passes over. To set-up this ability, adjust the SET BATTERY SELL VOLTS DC menu item under the BATTERY SELLING (17) menu heading for the maximum discharge voltage level acceptable. The SET MAX SELL AMPS AC menu item should be set for the expected maximum output of the solar array. Next, access the GRID USAGE TIMER (18) menu heading to allow setting of the time period that the battery will be allowed to recharge during by adjusting the SET START CHARGE TIME and SET END CHARGE TIME menu items. Outside of this time period, the inverter will sell the power stored in the battery to the utility grid until the voltage reaches the BATTERY SELL VOLTS DC setting.

This mode can use the battery to maximize the output of the system during a specific period of time. An example of these setting follows:

	Begin Day	Battery charging		Battery charging		End Day
00:00			08:00 10:00		18:00 20:00	23:59
Time		from grid has		from grid has
		stopped		started

End charge

time 08:00

Start charge
time	18:00

Bulk charging

has started

Float Volts

DC Setting

Set Float

Volts DC 13.4

Charging from the DC source (wind, hydro or solar) has started.

Set Float

Volts DC 13.4

DC Volts

Battery Sell Volts		Bulk Volts
DC Setting		DC Setting
Set Battery Sell	Set Bulk Volts
Volts DC 12.4	DC	14.4

Max Sell

Set Start Bulk

time 20:00

Set Absorption time h: m 2:00

Absorption Time

Max Charge

POSITIVE (+) = Inverter is drawing power from grid. NEGATIVE (-) = Inverter is selling power to grid.

Input	00	AC amps
amps AC		{
AC amps to grid (-)

AC amps from grid (+) {

Amps Setting

Set Max Sell

amps 30

Amps Setting

Set Max Charge

amps AC 30

LEGEND

Display/Settings on Control Panel

Information

Figure 28, Selling Power Stored In The Batteries; Hypothetical Time Of Day Operational History

Page

86

 2001 Xantrex Technology, Inc.	Telephone: 360/435-8826	SW Series Inverter/Charger
5916 - 195th Street N. E.	Fax: 360/435-2229	Part No. 2031-5
Arlington, WA 98223	www.traceengineering.com	Rev. C: February 2001