Figure 28, Selling Power Stored In The Batteries; Hypothetical Time Of Day Operational History - Xantrex SW Series Owner's Manual

Sw series inverter/chargers

Table of Contents

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

00:00

Time

Float Volts

DC Setting

Set Float

Volts DC

Charging from the

DC source (wind,

hydro or solar) has

started.

POSITIVE (+) = Inverter is drawing power from grid.

NEGATIVE (-) = Inverter is selling power to grid.

Input

amps AC

{

AC amps to grid (-)

{

AC amps from grid (+)

LEGEND

Display/Settings

on Control Panel

Information