The answer is quite simple.
Ohms Law ))

You raise a good question Ron. ?I think you are right that as long as the voltage that the panel produces is under 50V the wattage rating doesn't matter. ?If I'm wrong someone speak up.

David

Hi David,
I have just read the thread that transpired since our initial exchange. I think the others have answered your question much better than I could. That having been said, it brings another question to my mind. I have a solar panel that's rated at 150W. Not that I've ever seen that from it. Manufacturers tend to rate their products in ways that can only be called optimistic. I have used that panel on other equipment and I have seen numbers that put it within the voltage range called out in the doc's but well in excess of the 3A specified for the BP500. My question is this: If the voltage is within the specified range, will the BP500 only draw the 3A it wants. Or do I need to feed it through a current limiter (charge controller) between the solar panel and the BP500? The docs refer to a range of 13-50 volts, so I assume there is such a device incorporated in the BP500, but have not found documentation to that.

I have run the TX500 and other radios on BIG power supplies and batteries routinely. They only draw what they need. I assume the same will be true of the solar panel / BP500 combination, but have not yet done that experiment. Not to mention that here in Mich, we'll probably not see the sun again until some time in late May.

73,KC8SFQ/ Ron?

Sorry you're right. ?I missed that.

?

Thanks Philip. ?So you can charge the BP500 with the DC barrel connector connected to the BP500. ?Can you also charge the BP500 with the DC connector attached to the TX-500?

I own the BP-500. You can charge it while connected to the tx-500. I have charged it and it works. I have not tried a solar powered charger. I have not yet tried operating the radio with the bp500 attached whilst using a 12v supply directly to the tx-500, but I see no reason why it should not work. My understanding is that you CANNOT use an input to the battery pack WHILST an input power is supplied to the TX-500. I agree the graphic is not 100% clear but the written warning is.

Thanks Ron. ?I found the "Project Farm" video that you referenced in the LONG list of his videos. ?Wow what a comprehensive battery review. ?The winners look like the Sony or the LG. ?Here's the link to the video for others to view it:



K9AT
David
?

OK thanks. ?Do you own a BP500 and has this worked for you?

Dovetailing off of what Tim said the TX-500 already comes with an inline 3A "T" style fuse on the positive red wire of the power cable.

David
K9AT

You don't need to detach bp.
Connect 9-15V to trx, or 13-50v to bp.
Don't connect both at the same time, ok? ))

开云体育

To be fair they do have a picture below the text:



I get that you cannot have both the TX-500 and the BP500 receiving power at the same time. ?But looking at the top blue square with the blue check mark to the left it shows the BP500 separate from the TX-500 and that's the source of my confusion. ?Also the solar charging show the BP500 not connected to the TX-500. ?Is that the only way it can be charged being detached from the TX-500?

I know I'm getting into the weeds but the devil is in the details and I don't want to break the equipment.

Connect either or.
Don't connect both simultaneously.

Believe me I always read the directions before beginning a project, to a fault. ?If you don't believe me, ask my wife. ?I downloaded the BP500 manual which I encourage everyone to do if they contemplate a purchase. ?In the manual on Page 9 they make a reference to my question but they don't explain it clearly.

The BP-500 will not charge if an external power source is connected to the TX-500. ? Does this mean it's OK to hook up a power source with the BP500 attached to the TX-500?

If the battery pack is active, it will provide backup power if the transceiver's external

power supply is undervoltage (below battery pack voltage) or if external power is lost.

Solar panel cells can be used as a charging source, providing an output voltage in

the range of 13 to 50 V.

?

v1.20.02. (2023.11.30)
- Fixed beacon mode disabling when VOX is activated.
- Fixed incorrect frequency setup in some conditions when switching from MEM to VFO.
- General fixes and improvements.

I don't.
But I always read the docs first and then ask ppl if I don't understand something?

Андрей Денисюк, do you surf the many groups.io ham radio discussion boards and tell people to read the manuals whenever they ask questions about equipment?
73, Randy

On Thu, Nov 30, 2023 at 10:03 PM, David Holmgren K9AT "Ruffers" wrote:

Don't tell me the BP500 would have to be unscrewed from the TX-500 in order to use the DC input connector on the TX-500.

Why just not to read the manual?