A battery control scheme sets the logic on when the battery should charge/discharge, whether it should reserve capacity to offset load at a specific time (i.e. at peak electricity rate), and if the battery is allowed to charge/discharge to the grid.
In OpenSolar, you can select a battery control scheme, which will alter the savings your customer sees in their proposal. See more on how OpenSolar models battery energy storage here.
OpenSolar's Default Battery Control Scheme
OpenSolar has pre-built control schemes that you can use for your projects. The following options are available, but if they do not meet your needs, you can create your own scheme.
|Battery Control Scheme
(Also be known as load-following)
In most cases you would want to select this battery control scheme. This control scheme gets the battery to:
Due to the logic that applies by this battery control scheme, it will be the best control scheme to maximize self-consumption with a battery.
|Minimize Grid Import Cost
This battery control scheme is designed to maximize electricity bill savings of a Time-of-Use electricity bill by withholding capacity to offset the usage during peak electricity pricing.
Note: most cases using the "Self-consumption" control scheme will result in similar savings, since the battery discharge period generally coincides with the peak pricing periods. There are also some occasions when "Self-consumption" may have a higher bill saving than this battery logic due to the fact that the battery must withhold capacity for peak TOU periods and hence the battery may not be fully utilized to increase self-consumption.
This battery control scheme is designed to maximize customer bill savings by smartly charging/discharging the battery based on time-of-use cost of electricity, and generation and energy usage characteristics.
It achieves this by identifying optimal periods to:
(For California) This battery control scheme enables your project to take advantage of the high export rates in August/September put in place as part of the NEM 3.0 transition.
Note: OpenSolar does not currently validate system's battery control capabilities to optimize for favorable export rates. We recommend pros to continue using the "Self-consumption" battery control scheme if you are unsure.
|Peak Demand Shaving
This battery control scheme is designed to maximize savings for a bill that includes demand charges.When a utility tariff includes demand charges, these can make up a significant portion of a customers' monthly spend. A key benefit of installing storage is enabling the customer to limit exposure to demand charges by discharging at points of highest demand.
The Peak Demand Shaving control scheme prioritizes reducing peak demand (kW), thus reducing demand charges.
Note that this control scheme is most effective when:
(New Zealand Only)
This battery control scheme is generally not optimal for most system designs and is very specific for a niche use case in New Zealand. The battery will do the following:
Note: Given the niche use case of this battery logic, in most scenarios it does not result in improving electricity bill savings.
Apply a battery control scheme to your project
Once you've added a battery a system designs, you can select a battery control scheme.
Access OpenSolar's default schemes or a custom battery control scheme in Project > Design > Batteries. Here you can select from your entire list of control schemes.