Battery Integration with Sol-Ark Inverters

REV

20201125

| 16 |

Time of Use Selling / Energy Arbitrage

Discharge batteries to power circuits during specific set times. Program these times to coincide with the utility

company’s peak pricing times to avoid high energy charges from the utility.

Homeowners who have a net energy metering agreement with the utility company can use both Grid Sell and

Time of Use Selling modes to sell solar PV and battery energy (until the minimum programmed SoC percentage

level) back to the grid during peak sun-hour times and then discharge the batteries during programmed times,

usually in the afternoon and evening. Depending on whether

Limited power to load or Limited Power to Home

is enabled, the batteries will power either the critical loads sub-panel only (Limited to Load) or the critical loads

sub-panel and the main house breaker panel (

Limited to Home) during the Time of Use Selling time period.

Make sure to size the battery accordingly. (Refer to the Discharge Example in the

Grid Sell / Grid-Tied with

Battery Backup section of this Guide for battery bank sizing when batteries power the critical loads sub-panel

only. Refer to the Discharge Example in Section 3 of this Guide for battery bank sizing when the batteries

power both the critical loads sub-panel and the main house breaker panel.)

Homeowners who do not have a net energy metering agreement use both Limited Power to Home and Time of

Use Selling modes to prioritize powering all loads (circuits both on the critical loads sub-panel and the main

house breaker panel) from the solar and/or batteries during programmed times. Refer to the Discharge

Example in Section 3 of this Guide for battery bank sizing when the batteries power both the critical loads sub-

panel and the main house breaker panel.

NOTE: Either the Grid Sell or the Limited Power to Home mode (check the appropriate box in

the Grid Setup / Grid Param menu) must be used in conjunction with Time of Use Selling.

During Time of Use Selling times, loads are powered from solar first (if available), batteries second, and the grid

third (if batteries have discharged to their programmed minimum SoC percentage level).

Make sure the GridCharge box is unchecked during peak pricing times so that the batteries do not charge when

energy from the utility company is most expensive (see Figure 7).

Figure 7 – Limiter Tab in Grid Setup menu