[Rover] Primary Batteries

[Ev Tupis]

Adding to this thread...I see that there are three options to consider: Absorbent Glass Mat (AGM) Sealed Lead Acid (SLA) batteries, and lithium iron phosphate (LiFePO4).

Any comments on these in a high current environment?

Ev







On Wednesday, April 8, 2020, 7:12:44 PM EDT, Ev Tupis via Rover <rover at mailman.qth.net> wrote: 





Thanks, Sean.  I'm hearing either golf cart batteries or marine batteries from others, too.

-Ev






On Wednesday, April 8, 2020, 5:23:48 PM EDT, Sean Waite <waisean at gmail.com> wrote: 





The 100Ah AGMs I use top out at 30A or so continuous pull. We run a pair of them with a worst case of about 45-50A worst case draw and usually much less. With 75A expected draw you're looking at 3 of those in parallel or more likely going for heavier batteries. 

A lot of people like the 6V golf cart batteries in series+parallel to get 12V at the expected capacity and current rating. I'm using 12V batteries, it's what I found. 

I'm topping them off from the car while in motion. Definitely get some heavy power poles, or rather the Anderson SB series connectors. You don't want to overdraw your car battery while stopped. We disconnect when parked and then reconnect in motion. I need to pick up a big marine battery switch or something so I don't have the mechanical cycles on my connectors and also to make it easier to switch (our first rove required a wrench to disconnect 200Ah of battery from the car at each stop while on a rush. Not my idea of fun) 

I found really heavy gauge jumper cables, 4AWG or so, and have been using that wire for connecting things. The jackets are probably overly thick but it was the best price I found for that wire. 

I fuse with 80A fuses. I probably could reduce that rating but I wanted to leave headroom for the battery string to charge. 

I've thought about all sorts of other enhancements but there are other priorities and this works. Bring a fire extinguisher. 

73/Yours in Scouting
Sean Waite, WA1TE 

On Wed, Apr 8, 2020, 16:27 Ev Tupis via Rover <rover at mailman.qth.net> wrote:
> Hi List,
> 
> Could you offer me some insights?
> 
> I have a need to supply ~75 amps @ 12v during TX.  My plan was to put a battery (or two?) in my trunk along with the amplifier to keep leads short.
> 
> I'd keep that battery "topped off" by running some 6AWG from my under-the-hood battery.
> 
> Any recommendations for a battery for the trunk (or other insights)?
> 
> Ev, W2EV
> ______________________________________________________________
> Rover mailing list
> Home: http://mailman.qth.net/mailman/listinfo/rover
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Rover at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

______________________________________________________________
Rover mailing list
Home: http://mailman.qth.net/mailman/listinfo/rover
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Rover at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html