From Towers page:
NOTES FROM OUR TECH DEPARTMENT
Power your Electric Field Equipment from a single 12V source with the Deluxe
Power Panel. It provides 12V power to your electric starter, 12V or 6V fuel
pump, or 12V PULSED power to your glow plug clip. A variable control knob and
meter let you adjust glow plug current, detect engine problems, and check for
burned-out plugs. This Power Panel has a One-Year Warranty.

**New Features over the Old Power Panel include:

On-board constant charger delivers 300-400mA for glow ignitor and has a
green LED when glow ignitor is being charged.

Power all field equipment from a single 12V field battery. MOSFET-driven
glow heat adjustment and a new glow starter charger pack even more power
and convenience into a traditional sized power panel.

INCLUDES: One Deluxe Power Panel
Six Banana Plugs
Two Alligator Clips
Four mounting screws

SPECS: Length: 6"
Width: 3-3/4"
Depth: 2"
Weight: 7 ounces


COMMENTS: This charger will deliver approximately 300-400mA of continuous
current. Charging a glow starter for approximately 45-60 minutes
will supply enough amperage to start an engine multiple times.

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" Above are the advertisement instructions. It seems you need to adjust the current for 1.2- 2.0 volts , the higher you go the faster it will charge" From RC_FIEND

RC-fiend I believe you are mixing up the functions. The adjustment knob only controls the power to the glow plug of an engine attached to the panel for starting. Nothing to do with "charging".

There is a separate "fixture" on the panel on which to place a portable glow ignitor for field recharging and power to it is fixed.