The 0.5C-rate (or c/2) would be 17.5 amps for two hours, and so on. So what can he realistically expect from this setup?Ī 35 amp hour battery can provide 35 amps for one hour. He plans on adding a solar panel at a later time. James wants to run his radio with a 35 amp hour AGM battery and charge it with a 2 amp plug in charger. The official Yaesu specifications state that this radio consumes maximum 22 amps/304 watts on transmit, and 0.55-1.5 amps/8-21 watts on receive depending on the audio level (these numbers are rounded). Off Grid Ham reader James (whose question was the inspiration for this article) asked about going off grid with his Yaesu FT-450 radio. Before you can know how much battery you “need”, first find out how much power all your stuff consumes and what you plan on doing with it in the real world. It certainly does not help that many of the answers floating around the internet are based on guessing, hypothetical conditions, and overly generous manufacturer data. Before asking the question, provide some answers. The question is too open ended and comes with too many variables to give a definitive answer, but there are some basic battery concepts that will help you sort through this confusing topic. It’s always some variation of “How big of a battery do I need to run my (fill in the blank) radio?” It comes up a lot, not just in my email but also on the various forums and blogs I visit.
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