We have not tested a shorter hose as the data wasn’t applicable to the use.
But but but… For science! 
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So you’re just adding a second 7gpm pump right after the first, are you wiring it to the same battery?
Heck I may try this.
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I’m interested as well. got a 4 story hotel in my sights.
So the difference seems to be the two pumps in parallel. Just a y fitting to the pump inlets and a y fitting from the pump outlets to the reel ? Are you jawing just a single Proportioner or two separate inlet sources to the pumps?
Oh you have two batteries, I see now.
Thanks - check valves allow you to run a single pump if you don’t need the distance, or if one pump has issues.
I’m curious - have you had any issues with the relays ? Are those Delavan or Remco pumps? (I ask because I had two relays go out on two separate Delavan pumps (7gpm/100psi) but working great after replacement. They both show same build month so perhaps a bad batch…
Depending on the battery capacity, I think you could run off of one, but no redundancy. Plus, with two you can run longer between recharges. Very cool setup.
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Remco and no issues. 10awg wiring helps with that too.
You can run off one just less run time. We believe in redundancy.
Thank you.
If you run both pumps off one pressure switch, you shouldn’t need those check valves, right? Plus, diaphragm pumps are basically like check valves inside, so even if one fails you can’t have the other pumping backwards through it, right? In my testing I’ve found anything you can do to eliminate a fitting or elbow makes a big difference when dealing with lower pressure pumps like these. Heck, just switching the gun I use from a traditional Gilmour style to a straight through design got me 2-3’ more vertical distance.
I highly recommend looking into lithium Iron phosphate batteries for your 12v setups. Yes, the initial cost is high, but worth it. You get full 13-14v power for the full capacity of the battery, so no weak pumps once the batteries get low. Plus, unlike lead-acid batteries, you can utilize about 95% of its capacity, so you get much longer run times between needing to charge. The best part is, most are good for 6000+ cycles, so no replacing batteries every couple years. I’ve been running one for the past year it’s great. I’ve never seen the voltage drop below 13.4v, even after running it a couple hours.
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what tip are you using, jrod or a walmart soap tip? I found that the jrod gives me more distance.
You guys need to watch this video from last year I did. This is using a 5.5 NT pump, 3/4" line from proportioner coming into pump, 1/2" line going to reel, about 10" away, and with 250’ of 1/2" kuri tec.
In all my testing using 5.5 and 7gpm pumps, saw absolutely no increase in distance using 5/8" spray hose, in fact, saw less distance. But remember I use primarily for roofs, so don’t need more flow, just distance…
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This is where I say you need to test it out on your system. Prior guy swapped all of our trucks to 1/2" Kuritec, and it caused cycling of the pump (or something similar) and a lot of sputtering and pulsing if I recall. Swapped back to 5/8 (for at least the first 100-150’ at minimum) and the problem disappeared. I think connections and locations of the parts in the setup probably came into play as well… 
Upside, I had plenty of 1/2" hose (after a thorough cleanout) to make one heck of a whole-shop air system 
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This gun I’m using is a Dramm 74800 and has been great so far. All plastic internals so no worry about SH corroding anything. It’s basically just a plastic ball valve made into a nozzle with a thumb control. It’s a large diameter straight through so I get great flow and more distance than any standard spray nozzle. Like I mentioned previously, I’m seeing about 2-3’ more vertical distance and calculated about a 7-8% increase in flow when I bucket tested it. You could try one like this with your 12v systems, minus the injector I have on mine in this pic of course.
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I like that valve. $20 on Amazon. I’m using a regular ball valve right now, may have to try that.
Thanks - I just watched that one - saw your other video also where you discussed having less than 200’ of 1/2” Kuritec.
I agree - with my setup - using either 5.5 or 7 GPM - I am only able to get about 30-35’ regardless of the nozzle.
I’m interested in Heath’s setup and it caught my attention because of the distance. (It would have helped me a lot when I washed the golf course buildings. Thank god I had a boom)
My goal is to create a setup with the dual pumps and see if I can get the kind of distance Heath gets. I already have the pumps (I always order two at a time) so I should be able to set it up quickly in the off season.
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