Dual 12 volt batteries in my SUV

[merlin]

“ I jumped an aircraft battery on a helicopter with a ford truck.”

Had to be an H34.

Almost every time I go past this airfield (Oshkosh) someone’s on air talking about flying. Flying something interesting.

So don’t tell us it was an R22, okay.
.

Hmm, looked like 2 charges to start the bloody thing.

 

[slowmover]

Those have a 1500 HP Wright cyclone rotary engine and 28 volt system.

Yeah, yeah, details.

Radial, not rotary.
Sex appeal, not a feedlot cattle chaser.

Between truth and legend, print the legend.

Jump-starting the helichopter from the fuel truck having just off-loaded high octane av-gas makes it a better story. “95F departing Van Nuys”. Otherwise Oriskaney would be too far out at sea if that H34 didn’t leave now.

All in a days work . . for a wizard. 😉

.

 

[slowmover]

I’d argue in favor of having a two battery system for most any vehicle.

Mines twin start-battery. Glad to have some extra AH. If the truck ran an Amateur set-up I’d mount a frame-rail deep-cycle as dedicated.

Having a look over multi-bank marine set-ups is sobering. Can’t cheap out when it matters.

 

[merlin]

Yeah, yeah, details.

Radial, not rotary.
Sex appeal, not a feedlot cattle chaser.

Between truth and legend, print the legend.

Jump-starting the helichopter from the fuel truck having just off-loaded high octane av-gas makes it a better story. “95F departing Van Nuys”. Otherwise Oriskaney would be too far out at sea if that H34 didn’t leave now.

All in a days work . . for a wizard. 😉

.

Spell checker and me not paying attention.

 

[JustinWHT]

If the truck ran an Amateur set-up I’d mount a frame-rail deep-cycle as dedicated.

I was so fixated on matching batteries (two each Group 65), forgot to consider a deep discharge battery that can discharge 90% without problems compared to 50% suggested limit of a starter batteries.

Using physical switches instead of depending on electromechanical or solid state relays to manage charging different of battery types.

The deep discharge battery may have difficulty providing the momentary high current starter load, so I'd relie on original starter battery for turning over the engine.

Plan C would be a lithium jump start battery. My $65 Walmart Everstart EL224 died after charging it about 15 times. While I have a two-year warranty, they can't replace it as no longer available. It charged using a USB micro port, so that dated the design several years ago.
I'm looking at the Stanley FATMAX lithium 1200 Amp jump starter.

 

[slowmover]

Here’s an example of a frame-mount:

Under Vehicle Battery Mount - HiddenPower | Torklift International

The Torklift International HiddenPower is a unique and convenient auxiliary under vehicle battery mount for all types of Group 24 or 27 twelve volt batteries su

www.torklift.com

 

[JustinWHT]

Spell checker and me not paying attention

It can get worse...

https://community.ui.com/questions/Speech-to-Text-FAIL/8af2baf4-536d-40ec-a1b0-cd3259eacfc6

 

[TGuelker]

It is not a good idea to use the alternator to charge a discharged battery. The alternator is designed to keep the battery charged, not bring it back from the dead. I have replaced many alternators that failed because the lights were left on and the vehicle was jump started then driven rather than being put on a standalone charger. Sure, the jump will get it started. The alternator is going to run full field for quite some time to get the battery up.

 

[JustinWHT]

I'll concede to the recommendations and i've abandoned the dual lead acid battery idea.

The Group 65 battery is 25 Amp hours, I can get a $90 LiFePo4 30 Amp hours and a LiFePo4 20 Amp charger for $60. I asked several auto parts if they can recharge it using my charger and they will, takes about 90 minutes There's always an O'Reilly's and AutoZone around in small towns.

 

[JustinWHT]

I'll concede to the recommendations and i've abandoned the dual lead acid battery idea.

The Group 65 battery is 25 Amp hours, I can get a $90 LiFePo4 30 Amp hours and a LiFePo4 20 Amp charger for $60. I asked several auto parts if they can recharge it using my charger and they will, takes about 90 minutes There's always an O'Reilly's and AutoZone around in small towns.

 

[JustinWHT]

Going with this from O'Reilly's Auto Parts

https://www.oreillyauto.com/flux-500.html?q=121g

 

[JustinWHT]

Product Information​

• Gigawatts: 121
• Material Compatibility: Plutonium
• Working Speed (mph): 88
• Maximum Power: 121 Gigawatts

 

[JustinWHT]

I'll concede to the recommendations and i've abandoned the dual lead acid battery idea.

I went with the dual Type 65 lead-acid battery idea.

I asked several AutoZone stores if they would recharge my LiFePo2 battery using my charger and they weren't receptive to my idea. That and the inconvenience of sitting in parking lot or catching lunch to pass the couple of hours.

I'll finish my project next month and get pictures and details.

Many thanks for everyone's ideas and suggestions.

 

[JustinWHT]

My $65 Walmart Everstart EL224 died after charging it about 15 times. While I have a two-year warranty, they can't replace it as no longer available. It charged using a USB micro port, so that dated the design several years ago.

Update - there was nothing wrong with my Everstart EL224. I started using a multiport USB charger that apparently couldn't sense the Everstart. I started using a separate 3 Amp charger and works fine now. Instructions say it takes four hours to recharge it, five hours is closer.

While instructions suggest the battery to be jump started have at least 50% charge, it easily starts a battery with 10% charge left.