Recommended for Sonnenschein/Dryfit (German) and Deka Gel-Tech (US)
Temp Comp - 3 step chargers.
Temperature compensation and
Polarity protection with Selector
switch for battery type.
ICS 12V 25A ( General continuous Duty -
$289.00 US each
Pro PS 24v8A (medical and general
Dated 7th June 2007 but All Prices are subject to change -
e'mail for current quote;
Alligator clips are generally
Bare Wire cables ends,
General Battery product and charging information.
A common and elegant feature of the Sonnenschein/dryfit and Deka Gel-Tech is the use of dual acids in the electrolyte. These work in opposition. As Sulphuric acid migrates into the plates during discharge phosphoric acid migrates out to the gelled electrolyte, hence the electrolyte remains conductive at all states of charge. Not only does this retard sulphation, it is the key to fast recharging and of course removes the need for a hydrometer check of the specific gravity of the acid. They are the only manufacturers to use that patented process.
Sonnenschein/dryfit and Deka Gel-Tech are sealed using pressure sensitive valves, (hence the name- Sealed Valve Regulated - SVR- batteries). They work on a gas-recombination principle. During charging the normal hydrogen produced on the negative plate recombines with the normal Oxygen from the positive plate to produce water which is absorbed by the highly absorbent Gel or the plate separators. As these products use calcium type plates, which are by design a low-gas producer, efficiency of the internal gas recombination in normal use is almost 100% and very safe.
Since Sonnenschein/dryfit and Deka
Gel-Tech are designed for high current operation, there is no need for current
limiting during charging. However note that charging voltage differ due to acid Ph and
metallurgy between the various battery series!
Sonnenschein/Dryfit (German) and Deka Gel-Tech (US)
Charging.Sonnenschein/Dryfit (German) A200 product is
correctly charged (@ 2.4v/cell)14.4v/ and float voltage is (2.3v/cell)13.8v) @ 20°C to
30°C. US (Deka Gel-tech) is correctly charged at (2.35v/cell)14.1v with
13.8v float @ (68°F) 20°C.
Sonnenschein dryfit & Gel-tech batteries are
extremely efficient when recharging. Because of this high efficiency, it takes less time
to recharge. By design - dryfit Gel technology is self limiting on current!
Please Note. We only recommend that the
Sonnenschein dryfit or Deka Gel-Tech Cells batteries not be charged in a
sealed container or environment. In normal usage these Manufacturers sealed, gelled Lead
Acid batteries have no need to for special ventilation precautions. Ensuring that the air
surrounding the battery bank e.g. via air slots (or Limber Holes) is in contact with the
outside air, is sufficient. This opinion applies solely to
(gassing. pdf ) and Deka
For lower and higher ambient temperatures, from (minus) -22ºF up
to (plus) +120ºF, charge voltages should be adjusted according to the graph supplied with
each battery.This is the key to full performance and life. We
use these data for avalanche sensors in sub-zero mountain-sides to desert solar
applications with triple digit temperatures to achieve full cycle life and
General. Charging devices.
High return alternators or other chargers with three-step regulation and temperature compensation are widely available.They maximise fast charging and minimise fuel consumption without the headaches of constant monitoring. Note that with three-step charging, the combination of constant current and constant voltage are used quite safely in 1/Bulk charge-2/Absorbtion charge, then 3/float or finish. We fully endorse their use.They have stood the test of time, and are now used by most of the Charger/Inverter manufacturers. 3 step charger's use the excellent IUI characteristic in order to achieve minimum recharge time. We have worked closely with Heart, Trace, Newmar, AmplePower and the other major players since 1988 to provide competent technical support for their recharging products and their charging data are factory approved.
(Note. Generally we avoid the using Constavolt units as chargers in marine applications. They are Power supplies, not true battery chargers. NEVER use constant current chargers on any sealed battery !)
Tips and hints.
For maximum longevity, allow the batteries to 'rest' (neither charging nor discharging) for a short while after charging. Wet or flooded cells benefit most from this. For more complex charging data - e'mail your fax # to us! We are here to help! (Well, most of us! There is Bruce. The Surly.) As to the FAQ of product longevity, there are far too many variables from heat, cold, vibration, cabling, Charging regimen, undersized banks, Loose cables, Undersized cables, cheap cables (!), corrosion, AC ripple from the charging device etc etc for anyone to even make a reasonable guess as to why a battery will last 11 years in one RV Coach or Cruising Vessel and five or less in another!
Empirically, dryfit / Deka Gel-Tech will outcycle the AGM's by approx 15-20% in our experience. (Yes We sell and service both of these excellent technologies to Airboats, Oil platforms and Cruise Liners). Enough said!