GX-CS3 4500psi compressor current draw

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bmr4life

Member
Jun 2, 2020
152
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GA, United States
I've had my compressor for a couple months now. I have nothing but positive opinions for it, was well worth the $500. Link for anyone not familiar with this compressor.

I'm thinking about using a small battery pack for it to be ultra portable so I needed some amp draw measurements.

Max continuous draw is around 22 amps once it nears 4500 psi. A little less at lower pressures. The simple math for capacity is a 22AH battey would be able to run this PS for one hour. 10AH would around 25 minutes which should be enough to recharge something like my Sig Virtus 3 times.

If you're going to be out in the field shooting for a while charging from your vehicle, you may want to run the engine every now and then to make sure the battery doesn't get too low.

Anyway, here's the quick test.







https://www.youtube.com/watch?v=ZdXolXEQrOo










 
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Hobbyking might have something that will work, 2 5000mah 3s 30c turnigy lipos with parrallel connector

https://hobbyking.com/en_us/turnigy-5000mah-3s-30c-lipo-pack-xt-90.html?queryID=dd2b88a21cce463a4c5a35185fe6740d&objectID=69456&indexName=hbk_live_magento_en_us_products
Click to expand...

That would definitely work. I've been doing RC for a while and have several Lipo packs. I just wanted to get some data to verify my theory and gauge how much AH I would need.
Click to expand...





If you've been running RC, I am sure you know this, but for the sake of anyone else that tries it, make sure you don't run the voltage too low if you use the Lipo batteries. Most likely it would just ruin the pack, but there is a small chance that it could start a fire if you keep using it. You need to either monitor it closely or use as low voltage cutoff of some kind. 
 
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You cant run a lead acid battery like you want to!

A normal wet cell will deliver 60-70% of stated capacity before decay starts to set in (degradation of cell chemestry and permanent loss oc capacity) and that is at a 25% load not a 100% load!

A deep cycle LA fairs slightly better and will give 75-85% depending on load.

For a 22Ah draw in an hour i would say you need at least 50% more stated capacity ie. something like 34Ah capacity.



Why is it better to lug a compressor and a battery (both heavy) instead of a gubby bottle that you filled at home?

Not trying to degrade you in any way shape or form, just trying to understand your mindset!!!




 
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And if you go into LiPO batteries you need loads of support electronics or they'll die fast and violent!

There will always be a cell with least capacity and if you go near 0% charge that cell will fall below 2,45V and start to decay fast and maybe baloon and die (over time dendrites will form and erode capacity further). Normally the ESC will monitor that but in a direct discharge you're up S4!7 creek without a paddle if not wery carefull. If you go paralell the cells will ping/pong in discharging each others and again the weakest one will pull the other down the drain if not moitored. EV's use boatloads of 18650 cells as they're dirt cheap and use at i stated at the start "loads of support electronics" to circumvent the loss of weak cells before the others are depleted.

Just saying ;-)
 
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