Favorite Battery Charger/Maintainer/Power Supply
Here's a great 20 Amp battery charger/maintainer that can
be left on indefinitely. It's internal circuitry monitors charging voltage and
maintains a safe voltage.
IMHO, the Guest Marine Model 2620 is an excellent
24v choice for maintaining your batteries. It will not boil or overcharge your
battery and has a 20 amp capacity (10 amps per battery).
I had been using my Model 2620 for nearly 6 years
before it died. I was so impressed with this unit that I replaced it with their
Model 2620A. As of April 2013, I have about 8 years behind these Guest Marine
units keeping my Concorde batteries in top maintained shape. By the way, my
Concorde batteries are still going strong!
UPDATE: 12/2013 - My CB25XC batteries have been
retired after almost 9 years of service. Their positive terminals swelled and I
felt that was a sign that they had given all they could give.
When the new
Part 23 rules (signed into law by Congress and the President) are enacted by
the FAA some may choose to use the
ETX30L AGM technology battery option @ $99 w/Free Shipping from Battery Mart
with great 26 Ah, 400 Cold Cranking Amps performance specs and a weight of about
21.5 pounds. Read about AGM basics
Dimensionally it will fit where a CB25 battery would go
wood spacers to take up a little of the slack. ETX30L Dimensions: Length: 6.63"
x Width: 5.19" x Height: 6.88"
Here's another AGM candidate that some may choose
to use the
MTX30L AGM technology battery option @ an incredible $85 w/Free Ground Shipping from Battery Mart
with great 30 Ah, and a whopping 440 Cold Cranking Amps performance specs and a weight of about
24 pounds. Read about AGM basics
ETX30L Dimensions: Length: 6.65"
x Width: 5.16" x Height: 6.89"
See the Guest 2620A powering my roughly 4 second gear swings
In my opinion, the Guest is a good modest priced choice for
augmenting your battery during gear swings (because the amount of free play in
the hand crank is very dependent on system voltage) or when at
the avionics shop or in cold weather climates for that extra "edge" in cranking
Here is the latest model style available for
$168 on 1/2/2014 at Hodges Marine:
Unit comes complete with pre-wired 6-foot AC cord and 2 6-foot
DC outputs with ring terminals. Waterproof, fully-encapsulated electronics.
Lifetime warranty against internal water damage.
Components are completely sealed in durable,
corrosion-proof, waterproof thermal potting compound.
Full 3-stage charging for fast, full charging and
Potted components are fully impact protected.
Shockproof and vibration-proof.
Built-in electronic overload protection, with automatic
Reverse polarity and ignition protected.
LEDs indicate state of charge.
"Smart" technology can be left on without harmful
effects to battery.
All models may be used for storage/maintenance.
Thermal protection for extreme ambient temperatures.
Here is another option popular with 28 volt Beechcraft
owners, the Samlex Charger/Power
Model SEC-2425UL which offers 25Amps. See the Technical Specs
Samlex's "smart" battery chargers are designed to operate with lead
acid and gel batteries. Smart chargers evaluate the state of the battery’s
charge level, and apply the appropriate charging current. They will maintain and
condition the battery to maximize battery life. Protective features prevent
excessive heat buildup during charging. The Samlex unit is available from