VRLA stands for Valve Regulated Lead Acid, which means that the batteries are sealed. Gas will escape through the safety valves only in case of overcharging or cell failure. VRLA batteries are maintenance free for life.
Sealed (VRLA) AGM Batteries:
AGM stands for Absorbent Glass Mat. In these batteries the electrolyte is absorbed into a glass-fibre mat between the plates by capillary action.
Victron VRLA batteries can therefore be stored for up to a year without recharging, if kept under cool conditions.
Exceptional Deep Discharge Recovery:
Repeatedly deep and prolonged discharge has a very negative effect on the service life of all lead acid batteries, Victron batteries are no exception.
Battery Discharging Characteristics:
The rated capacity of Victron AGM and Gel Deep Cycle batteries refers to 20 hour discharge, in other words: a discharge current of 0,05 C.
The rated capacity of Victron Tubular Plate Long Life batteries refers to 10 hours discharge.
Effect of temperature on service life:
High temperature has a very negative effect on service life.
Effect of temperature on capacity:
Capacity reduces sharply at low temperatures.
Cycle life of Victron batteries:
Batteries age due to discharging and recharging. The number of cycles depends on the depth of discharge.
Battery charging in case of cycle use: the 3-step charge curve:
The most common charge curve used to charge VRLA batteries in case of cyclic use is the 3-step charge curve, whereby a constant current phase (the bulk phase) is followed by two constant voltage phases (absorption and float).
During the absorption phase the charge voltage is kept at a relatively high level in order to fully recharge the battery within reasonable time. The third and last phase is the float phase: the voltage is lowered to standby level, sufficient to compensate for self-discharge.
Battery charging in case of standby use: constant voltage float charging:
When a battery is not frequently deeply discharged, a 2-step charge curve can be used. During the first phase the battery is charged with a limited current (the bulk phase). Once a pre-set voltage has been reached the battery is kept at that voltage (the float phase). This charge method is used for starter batteries in vehicles and in uninterruptible power supplies (UPS).
Optimum charge voltage of Victron VRLA batteries:
The recommended charge voltage settings for a 12V battery.
Effect of temperature on charging voltage:
The charge voltage should be reduced with increased temperature. Temperature compensation is required when the temperature of the battery is expected to be less than 10°C / 50°F or more than 30°C / 85°F during long periods of time.
The recommended temperature compensation for Victron VRLA batteries is -4 mV / Cell (-24 mV /°C for a 12V battery).
The centre point for temperature compensation is 25°C / 70°F.
The charge current should preferably not exceed 0,2C (20A for a 100Ah battery).The temperature of a battery will increase by more than 10°C if the charge current exceeds 0,2C. Therefore temperature compensation is required if the charge current exceeds 0,2C.
Product Name: Victron 12V/90Ah AGM Deep Cycle Battery with M6 threaded terminals, 2 Year Warranty
(Global Trade Item Number): 8719076037187
Product Category: Batteries
Amp Hours (Ah): 90.0 Ah
Battery Voltage: 12V
Rated Capacity: 20 hr, discharge @ 25°C
(DOD – 80% under controlled conditions): 400 cycles
Charge voltage 'absorption': 14.2 - 14.6 (Normal)
CCA @0°F: 400
RES CAP @80°F: 130
NOTE: Float Design life: 7-10 years @ 20°C
Dimensions: 350 x 167 x 183 mm (L x W x H)
Net Weight (kg): 27.0 Kg
Manufacturers Warranty: 2 Years
* Where allowed by applicable law and regulations, batteries must be shipped via Ground shipments only.