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/diy/ - Do It Yourself

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1742847 No.1742847 [Reply] [Original]

I am considering installing an aux batter hung from the fram beneath the truck bed to power a Ryobi electric pressure that requires 13 amps at 120v. I would use the washer for about 2 to 3 minutes once to twice per week. I want to wash off my bike in the pit at the track, not all tracks have power outlets. I prefer not to buy gas pressure washer. What size battery do I need and is a starter or deep cycle batter a better option. I would install a cutoff switch to disconnect the aux batter whent he truck is not running, but charges when the truck is running.

>> No.1742856
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1742856

>>1742847

Overkill. I use something like this. I wash my car with it too. Bonus: rather than just let your wife sit around clucking in the henhouse area, she can keep it pumped up with pressure and be a contributor rather than spectator.

>> No.1742859

Do you have access to a spigot or water tank with a pump? Those cheap ass pressure washers do not like to be gravity fed.

Also, if you're planning on carrying a pressure washer around in the truck, why not just get a cheap generator as well from HF?

>> No.1742863

1560Watts to run the washer, add about 10% for inverter power losses (~1700W). An 80aH 12v battery would be 960Wh, so that would give you 20-30mins of runtime at full power.

But 13 amps at 120v means you need 130 amps at 12v. You're going to need multiple batteries in parallel and some thick ass wire. Generally 12v inverter set-ups are better suited for loads less than 1000W, you may have to look at a 24v system, a generator or a less powerful washer.

>> No.1742864

>>1742856
I use that too, but I still get some buildup in tight places that just needs a little 1600 psi to help it out of there.

>> No.1742865

>>1742859
I was trying to avoid buying a gas generator nor a gas pressure washer. But, if I have to go gas, then I will get a gas pressure washer. I was going to gravity feed the electric pressure washer, but if I have to go gas, then I have to gravity feed that as well.

>> No.1742866

>>1742847
130A @ 12V, 3min would be 0.05hr, so 6.5Ah in that time. Get yourself a deep cycle marine battery and parallel the thing up with your regular charging system, then install a cutoff switch when you’re using the pressure washer and turn the switch back on after you start the truck again.

But also what this guy said >>1742859 you probably want a hose connection because gravity feed will suck on an electric pressure washer.

And you could probably snag a 3000w gas generator for about the same money a deep cycle battery and the inverter to handle that wattage, something to think about.

>> No.1742867

>>1742863
thanks for the calculations, that is what I came up with, but since I new at this topic I was not certain if I was doing it right. I it is hard for me to beleive that little electric pressure washer would need so much battery power. Winches run off battery and the are pulling some serious weight.

>> No.1742868

>>1742866
The Ryobi gas pressure washer is looking better, simpler, faster than trying the electric washer with a battery route.

>> No.1742871

>>1742867

Yeah but winches are slow because they are using an incredible amount of mechanical advantage, you could pull a truck with your pinky if you have enough pulleys.

It all comes down to work/time=power. Having high pressure and high flow means you need a lot of juice.

>> No.1745114

start with a battery powered pressure washer
40-36v battery needs to be at least 4-5ah

ready made unit comes with battery and (lower wattage) charger
plug that into an inverter

>> No.1745139

>>1742865
Doesn't have to be a gas pressure washer. There are electric pressure washers that run okay off a gravity fed system. I use a Karcher K1122TST PW in my work, fed from a 225 gal tank without a pump and it works just fine. But as other people have said, electric PWs require a lot of electrons.

If you want to just have one machine to put around, I'd look into getting a belt driven gas PW. They'll pull from a tank no problem.

>> No.1745141
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1745141

>>1742847
Btw, do these things even work? I haven’t had a chance to try it out.

>> No.1745150

>>1745141
You have a medical condition man

>> No.1745155

>>1745150
I didn’t buy that one at least.

My mom was trying to get me Airpods for Xmas and I told her I’m going to break the things within a week at work and she should give them to my sister who mentioned she wanted them a couple weeks earlier. I told her if she wants to get me something I will actually use, get an 18V leaf blower since it’s half the cost of Airpods. But then somehow she brought up the pressure washer and I wouldn’t let her spend $400 on a gas one and this was on sale plus they sold the surface cleaner for it. The PSI rating is pretty good for an electric guy so we’ll see what happens.

>> No.1745186

>suggesting a wobble pump to be fed with gravity, without a cutoff.
>not realizing you need several feet of head to get reasonable pressure.

You people are insane.