[Elecraft] LED bulbs

[Fred Townsend]

Gerald, going back to WWII 24 V radio jeeps and trucks have been around. Some used 4 x 6 volt batteries. Some fire trucks and RVs use redundant 12 volt systems so there is still starting power if the primary system runs down. Low loss, high current FET switches are available for switching such systems. All it takes is lots of money and 000 gage wire.
73
Fred, AE6QL


-----Original Message-----
>From: Gerald Manthey <kc6cnn at gmail.com>
>Sent: May 12, 2015 3:54 PM
>To: Dave Olean <k1whs at metrocast.net>
>Cc: Elecraft List <elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] LED bulbs
>
>Dave
>I have a question for you.
>I too run off of solar when I am in my RV. I have a 900 amp hour battery
>bank. Using a 12v pure sine wave inverter. I took the battery bank and
>divided it to a 450 amp hour 24 volt system and it seems to last longer.
>Have you concidered this or even going to a 48 volt system?
>Just curious.
>Thanks
>Gerald.
> On May 12, 2015 1:44 PM, "Dave Olean" <k1whs at metrocast.net> wrote:
>
>> I am using my KPA500 while running on batteries. Sounds weird but true.
>> The KPA500 is quite efficient although it is always drawing some current
>> even when turned off. I can see that slight drain on my DC ammeters. In
>> receive, there is little current drain. Of course, when I start sending CW
>> I see the ammeter go up to about 70 amps. (Not a peak reading ammeter
>> either!). My battery bank is a pair of 275 AH solar AGM type 12 volt
>> batteries. The charging circuit is a couple of 220 watt solar panels. I use
>> a pure sine wave inverter that is pretty noiseless.  (Xantrex Pro Sine 1800
>> W) During the day when the Sun is out, the batteries charge up during the
>> receive cycle, so I don't deplete the batteries at all. At night I can go
>> for many hours and have never gotten close to even a 50% discharge. In
>> short, the K3/KPA500 combo is very efficient. I could not do that with my
>> big tube amps! The filaments and blowers would kill the batteries before I
>> even got the HV turned on!
>>
>> Dave K1WHS
>>
>> ----- Original Message ----- From: "Marc Veeneman" <mhvnmn at gmail.com>
>> To: "Wayne Burdick" <n6kr at elecraft.com>
>> Cc: "Elecraft List" <elecraft at mailman.qth.net>
>> Sent: Tuesday, May 12, 2015 3:25 PM
>> Subject: Re: [Elecraft] LED bulbs
>>
>>
>>  Not everyone can turn a QRP LED discussion into a KPA500 pitch with power
>>> plants as the bridge.
>>> --
>>> Marc
>>>
>>>  On May 12, 2015, at 10:33 AM, Wayne Burdick <n6kr at elecraft.com> wrote:
>>>>
>>>> LED bulbs are optical QRP, so not O.T. :)
>>>>
>>>>  If everyone swapped in LEDs over the next few years, we'd probably
>>>> eliminate the need for any new power plants.
>>>>
>>>> Even if we all started using KPA500s.
>>>>
>>>> 73,
>>>> Wayne
>>>> N6KR
>>>>
>>>>
>>>>  On May 12, 2015, at 6:18 AM, Marc Veeneman <mhvnmn at gmail.com> wrote:
>>>>> I don't think I've saved much money, though.  The reduced electrical
>>>>> demand won't justify the high cost of the modern day wonder -- LED lighting.
>>>>> --
>>>>> Marc W8SDG
>>>>>
>>>>> _
>>>>>
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