Building my first electric Drain Jetter

969 Views 13 Replies 4 Participants Last post by 57Chevy, Jan 1, 2022

Barrdann

Discussion Starter · Dec 26, 2021

Hello, so I wanted some different opinions and views on my project

I work in drainage, I have a petrol drain jetter can pack on my van. Current spec is a Honda GX630 petrol engine/ Interpump ws202 (200bar/21litres per minute)

I want to build A new drain jetter/pressure washer but with lithium ion batteries.

can anybody help advise me on the most suited BDLC motor and battery’s required.

so far I have found a 15kw bdlc motor that can be run with 72vdc.
The batteris supplying the motor will be from victron energy Google (HE lithium ion 25.6v 200ah)
I was looking at purchasing 3 batteries (25.6v and 200ah each) but connected in a parallel/series. These 3 batts would provide me with 15kwh (5kwh x 3)

do I need to compare the NM torque of Honda to specify the bdlc motor im looking at (golden Motor/EVMotorsport) are the two websites selling what seems to be suitable alternatives?

really appreciate if anyone can reply their views and if I’M on the right page.

A company called RIONED in Holland have built an electric drain jetter that has 6x 25.6v 209ah batteries in a series and it lasts all day. I only need something to last 4hours a day. And they have given no spec on the Motor they use.

tney are charging £80k plus for there machjne. The HE 25.6v 200v batteries are 3.7k each so I know it’s going to be expensive but I’m confident I can buiof for significantly less.

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57Chevy

· #7 · Dec 26, 2021

Your rating is steady-state; [at least some] motors use trickery to rate their outputs so be aware of the difference between what the manufacturer states and what the actual rating is once it is installed. The motor cooling system will need to reject around 600W constantly when operating which is enough to keep a bedroom cozy on a cold day. The motor design will also need to support that amount of heat rejection, i.e. forced air cooling or liquid.

An industrial 3 phase motor and VFD might be a better option as they are more established technology with realistic power curves.

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57Chevy

· #14 · Jan 1, 2022

What is your purpose for doing this? Imo you are making one or both of the two most fundamental mistakes people make when looking at alternative power sources.
1) doing it to save money, and
2) doing it to save the world, or some variant of that concept.

Making your business model suit the upfront cost of buying one will be a better outcome in the bigger picture, even though that might not make sense right now. How many jobs can you lose because your hacked together gear failed half way through? What is the cost to your reputation? What is your lost income due to having to build, fiddle with, maintain, repair, fault-find this home made solution? How many jobs do you lose because your battery is flat at 3pm and you need three hours at home to charge it? What is the cost of having an employee misuse/destroy it? Or the lost opportunity cost of not being able to give it to a future employee because it is too hack? All these factors go into the true cost of ownership.

IMO: go back to basics and ask yourself why do I need this

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