Car battery "not tolerate" a long stay without work. Deep self-discharge is harmful for him. If the car is put on long-term parking, there is a problem: what to do with the battery. Proposed a fairly simple device can serve both to recharge the batteries, and for their long-term storage in working condition.

Ris.1.Zaryadnoe device for car battery. Scheme

Since the secondary winding of the transformer T1, a current which is limited in series with the primary winding of the ballast capacitor (C1 or C1 + C2), with the secondary winding of the transformer T1, a current which is limited in series with the primary winding of the ballast capacitor (C1 or C1 + C2)
Since the secondary winding of the transformer T1, the voltage applied to the diode-thyristor bridge, the load which is battery (GB1). As the regulatory element used car voltage regulator generator (GNR) of 14 in any type, designed for generators with ground brush.
Were tested regulator type 121.3702 and integral-JA112A. When using the "integralki" findings "B" and "B" are connected together and with "+" GB1. Output "Z" is connected to the chain of controlling electrodes thyristors. Thus, the battery voltage of 14V is maintained at a charging current determined by the capacity of the capacitor C2, which is tentatively calculated by the formula:

where Iz - charging current (A), U2 - the voltage of the secondary winding with "normal" inclusion of the transformer (B), U1 - voltage.

Transformer - anyone with the capacity of 150 ... 250 VA, voltage on secondary winding 20 ... 36 V. The diodes of the bridge - all rated at not less than 10 A. Thyristors - KU202, D, etc.
S1 serves to switch between charging and storage. Charge current is chosen equal to 0.1 from the numerical value of battery capacity, and the current storage - 1 ... 1.5A.
If there is a possibility, periodically, about once every two weeks, it is desirable to produce the battery discharge current 2Iz to control the temperature of the electrolyte.
Settings device requires virtually no. You may need to clarify the capacitance by controlling the current ammeter. It is necessary to short-circuit the conclusions of 15 and 67 (B, C and W).