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Battery Recommendation?

Daniel Acevedo All Messages By This Member #24081 I want to build the BITX40 with an enclosure that can house a battery. I am hoping that a 12v/7a or 12v/5a battery will be sufficient for a few hours of RX and TX. Is there any recommendations for the amp hours in a battery? What is the minimum amp hours I should consider?
Thomas Noel #24095 开云体育 Daniel, If you figure the BitX as consuming about 200ma on receive, and 1 amp on transmit, and you figure a 4:1 ratio of receiving to transmitting, the average power consumption would be 4 x 200 ?plus 1 x 1000 divided by 5 equals 360ma. Round it up to 1/2 AH. It is a good rule of thumb to never discharge a battery beyond 50% of its rating, so a 5 AH rated battery will yield 2.5 AH, or about 5 hours of operation. It will actually yield less, because the rating is usually based on a 20 hour rate of discharge, and you will be drawing at twice that rate. The capacity of a battery is not linear - you get less out if you draw it fast as opposed to slow. I would go with the common SLA 7.2Ah battery if budget is important, or find a similar capacity LiFEPO4 if the price is acceptable. Look for a deal on a lithium power bank designed to jump-start a car. Cut the cable clamps off and add Anderson Powerpoles for convenience. Thomas W Noel KF7RSF toggle quoted message Show quoted text On Mar 27, 2017, at 9:23 AM, Daniel Acevedo <dan.ace86@...> wrote: I want to build the BITX40 with an enclosure that can house a battery. I am hoping that a 12v/7a or 12v/5a battery will be sufficient for a few hours of RX and TX. Is there any recommendations for the amp hours in a battery? What is the minimum amp hours I should consider?
Jerry Gaffke All Messages By This Member #24097 I haven't tried one, but we discussed those car starting packs previously: ?/g/BITX20/message/20577?
Daniel Acevedo All Messages By This Member #24099 Thanks Thomas, I am considering that I can add a solar panel to trickle charge the battery when not in use in the field. I will look into those portable jump start batteries.?
Michael Davis #24101 Well, I use a 5ah agm deep cycle that I got from Batteries plus bulbs for $35ish. I had 2 considerations. Available space and weight. The 7 and maybe the 9ah would fit but the radio becomes very heavy. I also cut 2 slots in the bottom of my enclosure to fit a velcro strap. The kind that goes through a buckle type of device and back on it's mating side, to strap her in. Then a charging port in the rear panel to charge with my battery maintainer. Works slick. Not sure of how long it will last yet. See Sent from Mike's iPad WA1MAD
Daniel Acevedo All Messages By This Member #24109 Michael, How much time can you run your radio for? I also like the 5ah battery because of its small size and weight.
peatmoss - ki6ssi All Messages By This Member #24110 I'm considering this one for backpacking. Its 2.3 pounds, 8.4 amps and 13.2 volts. You can draw up to 336 amps out of it, not that you need it :) https://hobbyking.com/en_us/zippy-flightmax-8400mah-4s2p-30c-lifepo4-pack.html
Donald Sanders #24114 Hobbyking also has a 4S 5000 mAH battery for $27.75.? Dr. Don?W4BWS toggle quoted message Show quoted text On Mon, Mar 27, 2017 at 10:24 PM, Daniel Acevedo <dan.ace86@...> wrote: Michael, How much time can you run your radio for? I also like the 5ah battery because of its small size and weight.
Dan Pflugrath All Messages By This Member #24115 I have been using this battery for 3 years running my ILER-40, the MDT and now the BITx40.? Works great, light weight, fits inside the case and am not aware of any degradation.? I doubt that it will deliver all 9800mAh as most of the Chinese batteries are overrated. Dan KA7GPP
Mvs Sarma #24120 7AH appears OK ?you might adopt a facity for charging same providing a dc socket with a max of 13.8V. all the best sarma vu3zmv On Monday, 27 March 2017 9:53 PM, Daniel Acevedo <dan.ace86@...> wrote: I want to build the BITX40 with an enclosure that can house a battery. I am hoping that a 12v/7a or 12v/5a battery will be sufficient for a few hours of RX and TX. Is there any recommendations for the amp hours in a battery? What is the minimum amp hours I should consider?
Michael Davis #24121 The slightly higher voltage on that lipo battery may make it a better choice for radio operation. In deciding on the AGM style battery, I wanted to be able to use a conventional charger/maintainer and external battery or power supply power through power pole connectors if necessary, without using some complicated switch to connect and disconnect. I guess that's what this fun project is all about...no two radios are alike, each is suited for our own use and layout. Still no answer to the "how long will it run" question. I think a better question is, when will band conditions get better so we can experience the gratification of having more frequent QSOs. BTW, I like the idea someone suggested, of having Bitx40 night, on a schedule and frequency. How about starting on Thursday 3/30 24:00 UTM for an hour or two? That would be 8pm N. America eastern time. Frequency 7285, the QRP calling frequency. We can try it and make a go of it every Thursday. 73 Sent from Mike's iPad WA1MAD
Thomas Noel #24126 开云体育 Mike, Message #24095 has the needed information to make a cocktail napkin estimation of useful hours of battery life. Basically: Make an estimate of YOUR rate of consumption based on listen/talk ratio. I used figure of 4:1 Use that ratio to estimate rate of power consumption. 4 x 200ma plus 1 x 1000ma divided by 5 = 360ma average. Look at battery claimed capacity - discard 1/2 (safety margin to protect life of battery) Discard another 10% due to faster rate of discharge than manufacturers use. So 7Ah battery is now 4200mah battery. Divide that by the 360 rate of consumption to get 11.6 hours use. Note this is heavily influenced by receive/transmit ratio. 2:1 would reduce operating time to 9 hours. This is also for an original BitX40 with manual analog VFO. I don’t know what the power consumption is for the Raduino/BitX combo. Thomas W Noel KF7RSF toggle quoted message Show quoted text On Mar 28, 2017, at 4:19 AM, Michael Davis <maddmd818@...> wrote: The slightly higher voltage on that lipo battery may make it a better choice for radio operation. In deciding on the AGM style battery, I wanted to be able to use a conventional charger/maintainer and external battery or power supply power through power pole connectors if necessary, without using some complicated switch to connect and disconnect. I guess that's what this fun project is all about...no two radios are alike, each is suited for our own use and layout. Still no answer to the "how long will it run" question. I think a better question is, when will band conditions get better so we can experience the gratification of having more frequent QSOs. BTW, I like the idea someone suggested, of having ?Bitx40 night, on a schedule and frequency. How about starting on Thursday 3/30 24:00 UTM for an hour or two? That would be 8pm N. America eastern time. Frequency 7285, the QRP calling frequency. We can try it and make a go of it every Thursday. 73 Sent from Mike's iPad WA1MAD
Frank Dinger , EI7KS All Messages By This Member #24132 quote === Look for a deal on a lithium power bank designed to jump-start a car. Cut the cable clamps off and add Anderson Powerpoles for convenience. unquote==== Yes ,that's what I have done . I removed the electronics present in a small enclosure in the battery power cable (meant to sense the low impedance of a drained car battery) fitting a suitable fuse instead and subsequently substituting? the "fat" short start cable with clamps by a thinner cable to suit a 30A Anderson Power Pole connector (my standard connector for radios and instruments) My battery has a bonus feature e.g. a flashlight and Morse SOS mode light. Bought from a local supermarket (Lidl)? here in Scotland. Frank ? GM0CSZ / KN6WH? in IO87AT toggle quoted message Show quoted text On Mon, Mar 27, 2017 at 7:54 PM, Thomas Noel <tnoel@...> wrote: Daniel, If you figure the BitX as consuming about 200ma on receive, and 1 amp on transmit, and you figure a 4:1 ratio of receiving to transmitting, the average power consumption would be 4 x 200 ?plus 1 x 1000 divided by 5 equals 360ma. Round it up to 1/2 AH. It is a good rule of thumb to never discharge a battery beyond 50% of its rating, so a 5 AH rated battery will yield 2.5 AH, or about 5 hours of operation. It will actually yield less, because the rating is usually based on a 20 hour rate of discharge, and you will be drawing at twice that rate. The capacity of a battery is not linear - you get less out if you draw it fast as opposed to slow. I would go with the common SLA 7.2Ah battery if budget is important, or find a similar capacity LiFEPO4 if the price is acceptable. Look for a deal on a lithium power bank designed to jump-start a car. Cut the cable clamps off and add Anderson Powerpoles for convenience. Thomas W Noel KF7RSF On Mar 27, 2017, at 9:23 AM, Daniel Acevedo <dan.ace86@...> wrote: I want to build the BITX40 with an enclosure that can house a battery. I am hoping that a 12v/7a or 12v/5a battery will be sufficient for a few hours of RX and TX. Is there any recommendations for the amp hours in a battery? What is the minimum amp hours I should consider?
Frank Dinger , EI7KS All Messages By This Member #24133 The Zippy flight max is great , high capacity + low size/weight ........but you need a dedicated charger with a cell balancing circuit ,which add to the price . The compact Lithium Ion car start battery has a standard (mobile phone type ) 5 V socket + an internal charger. Frank GM0CSZ / KN6WH???????? in IO87AT toggle quoted message Show quoted text On Tue, Mar 28, 2017 at 3:32 AM, peatmoss - ki6ssi <pete@...> wrote: I'm considering this one for backpacking. Its 2.3 pounds, 8.4 amps and 13.2 volts. You can draw up to 336 amps out of it, not that you need it :)

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