Date   
Re: 12v powering a solar Lifepo4 charger?

 

The concept is one input for solar, and on the output of the battery I use a trickle charger when it's not in use to keep it topped off.

I would put a 12v lipo charger before the battery in parallel with the solar charger so you can charge from car or solar.  I would not boost 13.8 up to 18v and then back down to the batteries.

If space is not available in your setup, maybe just a connection with Anderson's and keep the 12v charger in the car?

Something like... https://www.pololu.com/file/download/iMAXB6ACmanual.pdf?file_id=0J525

Re: 12v powering a solar Lifepo4 charger?

Greek Man
 

jim , I cannot find it in the article...
And I cannot understand exactly what you mean.
Connect the solar charger directly to the 12v car output? (will it function on that low a voltage?)
Or use an in between converter?




Check out my blogs!
http://greekpreparedness.blogspot.com/
https://survivalcomms.wordpress.com/
Στις Κυριακή, 14 Ιουνίου 2020, 03:57:18 π.μ. EEST, ο χρήστης Jim, K7JLJ <jim@...> έγραψε:


Put a 12vdc car charger in front of the solar charger.  I do this on my SLAB.

https://k7jlj.github.io/K7JLJ.com/my_qrp_solar_generator.html

It sits on my desk topped off by a PWRgate PG40S Battery Charger/UPS unless in the field.  I can also plug it into the car lighter when driving to charge.


- - -
Jim Linch (K7JLJ)
k7jlj.com / offgridcomms.info

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Saturday, June 13, 2020 11:51 AM, Greek Man via groups.io <greekpreparedness=yahoo.gr@groups.io> wrote:

> Guys, what are my options for powering a solar Lifepo4 charger from my car 12v circuit?
> (actually a wire straight from the battery, ergo 13.8V)
>

> will the MPPT function/charger even though it is 18V nominal?
>

> ATM the only solution I see is a DCDC stepup Controller
>

> thanks, Greekman
>

>



Re: 12v powering a solar Lifepo4 charger?

 

Put a 12vdc car charger in front of the solar charger. I do this on my SLAB.

https://k7jlj.github.io/K7JLJ.com/my_qrp_solar_generator.html

It sits on my desk topped off by a PWRgate PG40S Battery Charger/UPS unless in the field. I can also plug it into the car lighter when driving to charge.


- - -
Jim Linch (K7JLJ)
k7jlj.com / offgridcomms.info

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Saturday, June 13, 2020 11:51 AM, Greek Man via groups.io <greekpreparedness=yahoo.gr@groups.io> wrote:

Guys, what are my options for powering a solar Lifepo4 charger from my car 12v circuit?
(actually a wire straight from the battery, ergo 13.8V)
will the MPPT function/charger even though it is 18V nominal?
ATM the only solution I see is a DCDC stepup Controller
thanks, Greekman

Re: Check In Here

 

Welcome Prosnaps@..., 

You will still need to take a test to operate on armature bands. (https://en.wikipedia.org/wiki/General_radiotelephone_operator_license) The Tech test is very easy to pass though, but a General test is needed to get on HF outside of CW.  I suggest studying for the General and making an attempt the night you take your Tech.  You can take both at the same time and most clubs encourage this. ARRL (http://www.arrl.org/find-an-amateur-radio-license-exam-session) has a listing of testing going on near you.

Are you looking for HF radios or VHF?  Better yet, what is the communication you want to use it for?  

For cheap solid comms in the VHF/UHF arena I can recommend https://k7jlj.github.io/K7JLJ.com/tac_comms.html

For HF, one and done...  I love my Ten-Tec 559, but recommend the Yeasu FT-891

Antennas = Start with a simple Dipole.

Re: Check In Here

Prosnaps@...
 

Hi all! Retired military looking to set up a ham location as well as monitoring emergency services.  I have the GROL from the FCC, however ...do I still need the other tests?  Also I want to get some opinions on radio and antenna recommendations.  Not ready to slam lots of money yet and want to be mobile. All thoughts and directions are most appreciated 

12v powering a solar Lifepo4 charger?

Greek Man
 

Guys, what are my options for powering a solar Lifepo4 charger from my car 12v circuit?
(actually a wire straight from the battery, ergo 13.8V)

will the MPPT function/charger even though it is 18V nominal?

ATM the only solution I see is a DCDC stepup Controller

thanks, Greekman

Re: 05/23/20 new article posted on offgridham.com

Greek Man
 

Since I have not cut my teeth in the filed that much, I have just minors to offer...

- too thin an assortment of adapters. And as always it is th eone you left behind, that is needed.

- too many different batteries of the same kind. (i.e. Lifepo4 in different specs and batches). This will hinder you of making larger packs.






Στις Κυριακή, 24 Μαΐου 2020, 01:32:21 π.μ. EEST, ο χρήστης Chris Warren/offgridham.com via groups.io <solarham@...> έγραψε:


We've all been there. What mistakes have you made the turned you into a better ham? 

https://offgridham.com/2020/05/off-grid-mistakes/

05/23/20 new article posted on offgridham.com

Chris Warren/offgridham.com
 

We've all been there. What mistakes have you made the turned you into a better ham? 

https://offgridham.com/2020/05/off-grid-mistakes/

Combining SLA Charging with LiFePo4 BMS Board?

Greek Man
 

I wonder if this combination is possible for charging 4S LifePO4 batteries

lead-acid Battery Charging Controller with adjustable output
https://www.ebay.com/itm/6-60V-lead-acid-Battery-Charging-Controller-Protection-Board-switch-12V-24V-48V/233195863716

and controlling the charge with this
https://www.ebay.com/itm/4S-30A-12V-BMS-Protection-Balance-PCB-Board-For-LiFePo4-LiFe-18650-Battery-Cells/322790711613

As far as I can tell this charging board, outputs constant current, with a user settable termination voltage.
(in fact it can "charge" any battery this way)

Re: Solar to charge Radio Batteries #Solar

B Johnson
 

I'd also suggest you look at this web site -- he's posted a lot on portable power for hams

https://offgridham.com/2019/05/portable-dc-power-pack/

Barry
K8NWB


-----------------------------------

On Thursday, May 14, 2020, 12:03:37 PM EDT, John McDonald <jbm1776@...> wrote:


How to calculate the size solar panel(s) required to charge radio batteries ?

Application: Portable/backpack radio & battery recharged via solar panel:

12V, 12Ahr Lithium Iron Battery provide power to Yaesu FT817ND or FT857D
Motorola PMNN4077C 7.4V, 2200mAh Battery in Moto XPR6550 hand-held

Charging using the 110vac wall-wort takes several hours, seeking the correct wattage of multiple small or larger roll-up solar panels to adequately recharge the radio batteries.    
 

  

Re: Solar to charge Radio Batteries #Solar

Kilovolt
 

Re: Solar to charge Radio Batteries #Solar

Kilovolt
 

Re: Solar to charge Radio Batteries #Solar

Randy Davenport
 

To the original post, I have 7ah battery that I want solar charge info.
Randy ka4nma

On Thu, May 14, 2020, 12:03 PM John McDonald <jbm1776@...> wrote:
How to calculate the size solar panel(s) required to charge radio batteries ?

Application: Portable/backpack radio & battery recharged via solar panel:

12V, 12Ahr Lithium Iron Battery provide power to Yaesu FT817ND or FT857D
Motorola PMNN4077C 7.4V, 2200mAh Battery in Moto XPR6550 hand-held

Charging using the 110vac wall-wort takes several hours, seeking the correct wattage of multiple small or larger roll-up solar panels to adequately recharge the radio batteries.    
 

  

Solar to charge Radio Batteries #Solar

John McDonald
 

How to calculate the size solar panel(s) required to charge radio batteries ?

Application: Portable/backpack radio & battery recharged via solar panel:

12V, 12Ahr Lithium Iron Battery provide power to Yaesu FT817ND or FT857D
Motorola PMNN4077C 7.4V, 2200mAh Battery in Moto XPR6550 hand-held

Charging using the 110vac wall-wort takes several hours, seeking the correct wattage of multiple small or larger roll-up solar panels to adequately recharge the radio batteries.    
 

  

Re: Best HT for scanning?

Kilovolt
 

If you just want to add a TNC to your current HT, then check out https://store.mobilinkd.com/products/mobilinkd-tnc2-2
I've been using this one for APRS with my Baofeng, with no issues while working SATs, cables sold separately. https://store.mobilinkd.com/collections/tnc-cables


4Bs/73

Tactical Comms Setup

 

Might be of interest to some here.  

https://k7jlj.github.io/K7JLJ.com/tac_comms.html

Re: Best HT for scanning?

va7cfn <va7cfn@...>
 

I had a TH-D72A and it was nice the TNC for APRS and WinLink and, to be honest, somewhat regret trading it away. But, traded it for a well used 480Sat which is also a great radio. 

My HT is an ID-51A Plus. It doesn’t have a TNC and DStar doesn’t really appeal to me so I don’t use it. Scanning AM aviation band, up to marine band VHF and full 70 cm scan. Great Tx and Rx. Fast scanning. 

Its an expensive HT, though. I’m interested to see what others suggest.

Best HT for scanning?

 

I'm in the market for a nice HT that has the fastest scanning available.  Scanning channels mostly, but band width scan would be nice also, along with CTSS scanning.

Dual receivers is icing, dual watch will work.

My only candidate is the Kenwood TH-D72A at this point.

I'm not brand loyal and would prefer something less expensive if possible.

Any suggestions?

Re: Modimying a mediocre HT antenna?

Greek Man
 


that general guideline was what I was asking for.. thanks.

regarding Rubber ducks, do not worry, I will be doing the research anyway...
I need 3, which all will be DIY/Converted.

Στις Τρίτη, 21 Απριλίου 2020, 02:42:51 μ.μ. EEST, ο χρήστης randall krippner <randallkrippner@...> έγραψε:


 generally if the swr goes down as you increase frequency the antenna is too short, and if it goes down as you decrease frequency it's too long. But that's for a standard wire type antenna. I've never played around with rubber duck style antennas. They can be difficult to deal with, especially the multiband ones because of the coils, and because the antenna itself is likely a coil inside of the rubber covering.

Re: Modimying a mediocre HT antenna?

Greek Man
 








Check out my blogs!
http://greekpreparedness.blogspot.com/
https://survivalcomms.wordpress.com/
Στις Τρίτη, 21 Απριλίου 2020, 02:42:51 μ.μ. EEST, ο χρήστης randall krippner <randallkrippner@...> έγραψε:


 generally if the swr goes down as you increase frequency the antenna is too short, and if it goes down as you decrease frequency it's too long. But that's for a standard wire type antenna. I've never played around with rubber duck style antennas. They can be difficult to deal with, especially the multiband ones because of the coils, and because the antenna itself is likely a coil inside of the rubber covering.