SimpliPhi AccESS Installation Manual

REV110619

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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 essential loads sub-panel only

(Limited to Load) or the essential 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 essential 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 essential 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 essential 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

essential 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 24.0 – Limiter Tab in Grid Setup Menu