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Battery Backup

ups system battery backup

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#21 BoxCar

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Posted 25 October 2020 - 07:14 PM

100W at 12vDC is 5A of current and it is probably a little more than 1/3 of your transmit draw. Your batteries should recover the drawdown from 1 minute of transmit time in about 4 minutes with your panels putting out the full wattage.


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#22 Savage

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Posted 25 October 2020 - 10:03 PM

I have 2 deep cycle batteries on a 100watt HF solar panel kit. I may expand it to the full 400w it's capable of but I think the 100w panel should keep me on the air no problem.

 

Do you have a basic, bare bones setup and if so, out of curiosity what are you using?  As always, I start down a path and next thing I know I'm $1,500 (or more) into what I thought was going to be a simple setup.

 

I'll eventually do this for emergency power but have been spending more than usual on shtf things so am holding off on this for now.  At one point I was going to drop a greenhouse in the backyard and use solar for hydroponic pumps, lighting, etc. and this exercise reminded me of why I held off on that project too. 



#23 FrancisHaws

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Posted 26 October 2020 - 12:35 AM

Do you have a basic, bare bones setup and if so, out of curiosity what are you using? As always, I start down a path and next thing I know I'm $1,500 (or more) into what I thought was going to be a simple setup.

I'll eventually do this for emergency power but have been spending more than usual on shtf things so am holding off on this for now. At one point I was going to drop a greenhouse in the backyard and use solar for hydroponic pumps, lighting, etc. and this exercise reminded me of why I held off on that project too.


I went the bare bones route with a 100w harbor freight solar kit, it comes with everything you need minus a battery and an inverter. I just wanted something to keep my radios online and charge electronics so I don't have to run my generator 24/7 in the event of a long term power outage like we have had in the past from ice storms. The long term plan is to expand my solar to 400w so I can run my fridge and deep freezer intermittently off an inverter to keep food from spoiling. I run wood stoves in the winter anyway to keep my heating bills low so that covers that.
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#24 berkinet

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Posted 26 October 2020 - 12:27 PM

I went the bare bones route with a 100w harbor freight solar kit, it comes with everything you need minus a battery and an inverter....


Is the inverter just for your A/C appliances? If you are using it for your radios, you should be tying them directly to the battery... after all, virtually all of them run on 12vdc.

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#25 FrancisHaws

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Posted 26 October 2020 - 05:53 PM

Is the inverter just for your A/C appliances? If you are using it for your radios, you should be tying them directly to the battery... after all, they virtually run on 12vdc.

Yeah they are for my fridge/freezer and some led lights that came with the kit. I use a cheap 10ah battery on a charger for my gmrs mobile base radio. I also have a 12v power supply which runs my cb currently but I can just tie that in to the battery if the power goes out.

#26 Savage

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Posted 26 October 2020 - 09:44 PM

Yeah they are for my fridge/freezer and some led lights that came with the kit. I use a cheap 10ah battery on a charger for my gmrs mobile base radio. I also have a 12v power supply which runs my cb currently but I can just tie that in to the battery if the power goes out.

 

How much life does the 10ah battery give your base?  I keep getting drawn into thinking I need 100ah or more.  



#27 FrancisHaws

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Posted 26 October 2020 - 10:27 PM

How much life does the 10ah battery give your base? I keep getting drawn into thinking I need 100ah or more.

Probably several days but I always put it on the charger at night so I can't say for sure. For example, today my btech 50x1 was on it all day scanning and I transmitted for maybe 30 mins total on high power (50 watts) and it never dropped below 14.1 volts. The radio needs a minimum of 13.8 so I figure under normal use I can get several days out of a single charge. I also have 2 large deep cycle batteries from my trolling motor that I keep hooked up to a 100w solar panel so in the worst case scenario I have that to fall back on. The small battery I use for my station is the 10ah harbor freight one for their electric start generators. It's smaller than a lawn tractor battery and easy to transport so that is why I use it. I think a regular size car or truck battery and a small solar panel would be more than enough to keep you on the air 24/7 as long as you you aren't rag chewing the whole time
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#28 O-B-1

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Posted 27 October 2020 - 08:15 PM

If you don't need the meters, this is the model without them. https://www.toboaene...Supply | $156.8

 

If you don't need the 100A capacity, you may like this: https://www.toboaene...-25amp-charger/

I always over-engineer... It allows for later expansion without buying EVERYTHING all over again. If you don't plan on doing anything but the one radio, by all means, go as light as you can.


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#29 BoxCar

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Posted 27 October 2020 - 08:27 PM

Personally, I think you are way over engineered. I would look at other supplies such as some of the inexpensive Chinese ones. I'm running a 30A no name that's designed for communications work and paid less than $25 for it. If you want a good Chinese one, look to Mean Well. Their supplies are a little more than what I paid but have a great rep. My little cheapie has millivolts of ripple, so little I can't measure it accurately with my cheap Harbor Freight meter.


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