SAG & RIPPLE SIMULATOR

Press play. Watch the volts, who supplies the amps, and the ripple.

Every default is tagged RATED (datasheet / supplier sheet) or EST. EST numbers are starting guesses, not measured EVUL data.

VOLTAGE AT THE ESC

WHO SUPPLIES THE AMPS

Packs in parallel share the amps in proportion to how low their resistance is, for the whole pass.

LIVE CIRCUIT

RIPPLE ZOOM

CAR & MOTOR

Motor rated power EST Motor kV (optional) Car weight (lb) EST 1/7 Outlaw guess Tire grip μ EST Pass length (s) Load profile

MAIN PACK

Cells in series Cell Cells in parallel Cell IR (mΩ, blank = EST from burst rating) Pack leads + plugs (mΩ) EST

PARALLEL PACKS

Extra packs in parallel Capacity per cell (mAh, blank = same as main) Burst C (blank = same) Cells in parallel (blank = same) Cell IR mΩ (blank = EST) Grams per cell (blank = same)

Cell count always matches the main pack. Default: one extra 8,000 mAh pack, so the car runs 8S4P. Set this to 0 to see one pack alone.

ESC XC E6 MAX

Current limit (A) 550 A RATED max Peak current override (A) ESC leads (mΩ) EST Switching frequency EST, not published Ripple board

WHY NO SAG CAP BANK?

Sag cap banks were taken out of the simulator. The ones that could carry a launch are too big for a 1/7 Outlaw car or can only be had by quote, the buyable ones are costly per volt saved, and every bank hands the load back to the cells within a second or two. More cells in parallel help for the whole pass. The ripple board above is a different job: keep it.

WHY NOT SAG CAPS? ▶

HOW IT WORKS

Everything shares the load at the same instant. The main pack and any parallel packs sit on one bus. Each gives current in inverse proportion to its resistance, all at once.
More cells, less resistance. Most of the loop resistance is inside the cells. Doubling the cells in parallel roughly halves it, so the sag roughly halves too, for the whole pass.
The faded line is the main pack alone. The shaded gap between it and the bright line is the sag the extra packs save.
Ripple is a separate job. The ESC chops current thousands of times a second. The ripple board at the ESC handles that; no battery is fast enough or close enough.

Assumptions (all EST): 4.20 V/cell start with a typical LiPo voltage-vs-charge curve; cell IR = 0.414 V ÷ cell burst amps when blank; launch current steps to the peak (ESC limit or override) then decays toward motor watts ÷ 0.85 ÷ full voltage with time constant watts ÷ (μ²·g²·mass); ripple ΔV = I·D(1−D)/(f·C) + I·ESR at D = 0.5. E6 MAX 550 A is RATED.