Quick Answer
For extended Ham radio use, 4-6 battery packs are recommended, depending on usage patterns and desired uptime. This can include a primary pack, a backup pack, and 2-4 additional packs for redundant power sources.
Assessing Power Needs
When calculating power needs, consider the specific Ham radio model and its average power consumption in watts (W). A general estimate for HF transceivers is around 10-20 W, while VHF/UHF units may consume 5-15 W. For example, the Yaesu FT-857D’s average power consumption is around 13 W. To determine the required battery capacity, calculate the total energy needed in watt-hours (Wh) by multiplying the power consumption by the desired uptime in hours.
Choosing the Right Battery Packs
Opt for deep-cycle batteries with a high capacity in ampere-hours (Ah) and a suitable voltage for your Ham radio. For most modern radios, look for 12V lead-acid or lithium-ion batteries. A suitable battery pack should provide at least 50-100 Wh of energy, considering a 4:1 safety factor for deep discharging. For example, a 12V 7Ah battery pack provides 84 Wh, sufficient for a 4-hour uptime with a 13 W average power consumption.
Sizing the Battery Bank
To ensure continuous operation, consider a redundant power source, such as an additional battery pack or a power source with a separate battery. In this case, aim for a total energy capacity of at least 200-400 Wh, depending on the Ham radio’s power consumption and desired uptime. To achieve this, you may need multiple battery packs connected in parallel or series.
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