Describe the bug

For a BTM battery that is very small compared to the load, peak shaving never dispatches the battery because of 3% safety factor on grid power target to account for AC/DC conversion issues when setting the target: https://github.com/NREL/ssc/blob/80651e1e3593f4179b9411f35c70978f05e91710/shared/lib_battery_dispatch_automatic_btm.cpp#L511

Given recent changes with better modeling of AC/DC conversions in other parts of the code, revisit this safety factor.

To Reproduce

Steps to reproduce the behavior:

1. Create a default PV Battery / Commercial case.
2. On the Electric Load page, set scaling factor to >30.
3. Run a simulation, note battery does not discharge.

Original user case had 600 kWdc PV, 500 kW / 2h battery, 66,000 kW / 270,000,000 kWh load