Lets talk buddy bottles!

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I cannot recommend the Ninja 90cu-in with EZ-Valve enough. Built in check-valve on the neck which acts as a PV during top-off. No need to backfeed through the valve. Made in the USA. Excellent support and service. Dual gauges. Single action on the valve -- screw down to fill, back off to shut off and bleed. Incredibly easy to use and the valve is rock solid quality.

I fill mine with my LC-110 which has about 15 hours on it. Keeps the duty cycle nice and light.

90 Cubic Inches = 0.052 Cubic Feet

My Pulsar has a 300cc tank and I get about 3 fills from 4500 PSI to 230 bar from 148-150 bar. This gives me about 250 shots before I have to refil my tank.
 
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I have two 90 c1 Ninja bottles. One 8 years old, the other 5 years old. Started with the Gold 3000 PSI output regulated version, but I managed to destroy the first one (stupidity on my part) and the second reg needs a rebuild. I replaced the regulator on the first one with a Jubilee Valve (5/8 inch neck if you need one) and it still works great. The Ninja valves are not easily available due to supply chain shortages.

The regulated version is nice if you are concerned with overfilling your gun. Bottle can be at 4500 and output is only 3000 no matter what. The Jubilee Valve is just a valve and allows me to put full pressure into my guns. PA sells the Jubilee Valve in both 5/8 for paintball tanks and 7/8 for scuba tanks.

Never counted the number of fills for my Marauder (I think it has a 180cc tube) so can't tell you how many fills but I think it's between 6 and 12 fills. Since the tube on a P-Rod is considerably smaller, you'll get more fills.


 
To saltlake's point, regarding overfilling, the bottle I have is slow fill output. I can fully open the valve and the air output remains constant so it's not hyper-blasting my PCP with a huge volume of air very quickly. The fill process is uneventful and takes a few seconds. It allows the PCP to sip the air instead of getting blasted in the face with a firehose.

Lets say my bottle is 300 bar. I get 3 fills into my Pulsar before the bottle is around 230 bar. At this point I could simply leave the valve open and the bottle connected and shoot tethered until the bottle pressure and gun pressure is around 150 bar. I've added capacity by using the bottle tethered.

No issues going regulated bottle either just from a tethering aspect you can tether an unregulated bottle using the approach above.
 
I would not fill 90cu-in with the Nomad; it has a history of self-destructing with extended use. I'm not knocking it -- probably great for your pRod -- but it's a lot of work to initially fill the bottle and top it off. They're just not built for that.

The Nomad with the pRod is pretty well "right sized" for longevity. Adding a 90cu-in bottle into the mix is overloading the cart and asking the mule to carry it.

Bio gives sound advice so if you want the "inexpensive" route go with the Yong Heng and a condensate tower setup. Otherwise you can "go big" and do what I'm doing with the LC-110 that fills my 90 cu-in Ninja.

Undersize the load, oversize the compressor. :)