The proposal involves sequentially connecting ten heaters, one for each hive, to the secondary…

The proposal involves sequentially connecting ten heaters, one for each hive, to the secondary winding of a transformer with a power rating of about 120 W, providing 7 and 14 V outputs. These voltages are typical for rectifiers used to charge batteries. The heaters can operate on both AC and DC. Their performance is monitored using a 10 A ammeter in series with the heaters. If an ammeter is unavailable, a 2.5-3.5 V indicator lamp can be connected in parallel with one heater; the lamp will extinguish if the circuit breaks, and will glow dimly when functioning properly.