AnswerBun.com

Vehicle Alternator/Inverter system

Electrical Engineering Asked by Abcd123 on September 15, 2020

I have a food van with a stock alternator on the engine, and a 3000w inverter setup. The inverter setup uses 2 Trojan leisure batteries. Somehow the inverter setup is also linked to the alternator (I’m sure of this). I have only ever used this for small items like a travel kettle or phone charging. Today I purchased a Slush machine which is rated at 920w. I tried it on the inverter and it ran for a few mins, however as soon as the compressor kicked in the inverter switched off.

The inverter is rated at 3100w continuous power, and 6200w peak power for 1 second.

When the compressor kicks in and inverter switches off, the watt meter on the inverter displays 1920watts.

Now obviously it’s clear that the inverter cannot run the slush machine, so I was wondering what possible solution there are out there.

I should also add that the inverter and batteries were not used for around 18 month prior to fitting the slush machine. What would be the best way to test their batteries? Voltmeter?

I was thinking of adding a second alternator in the engine, would this work to provide enough power to the inverter and it’s batteries to power the slush machine.

2 Answers

I would test the Slush machine on a known stable supply - you need to establish the starting characteristics of the compressor.

Some recommend that the inverter capacity has to be 5 times the rated load... 5 * 920 = 4600W, so you will probably need a different inverter or consider the other solutions from hacktastical.

Answered by Solar Mike on September 15, 2020

Can you borrow a current meter and see what the slushy machine is drawing when the compressor kicks in? Then try the same test, using the inverter to see what's tripping it up. Maybe your specific inverter isn't up to the task, but another one might be. Or there may be an issue with the wiring to the inverter (too much IR drop maybe?)

To your thought, they do make 110V alternators for underhood. Example here: https://www.fabcopower.com/generat/bgen.htm Major drawback of this approach: you have to run the engine at a specific RPM to get the correct 60Hz, so that means something to set the throttle, too. Your customers won't like breathing the engine fumes or hearing the noise.

A sure-fire solution (and possibly cheaper, considering installation) would be a small gennie to run the machine.

EDIT: check the battery condition. If they’ve been sitting unused they may have sulfated and thus will not be putting out enough peak current for the compressor start-up.

Answered by hacktastical on September 15, 2020

Add your own answers!

Related Questions

Why X0 equals zero?

1  Asked on January 25, 2021 by omar

   

What’s the catch with FRAM?

4  Asked on January 25, 2021 by david-given

         

Best-practices for potting a high-voltage circuit

3  Asked on January 25, 2021 by adam-v-steele

     

How to find True power dissipated and apparent power?

2  Asked on January 25, 2021 by michael-scott

 

Connecting MAX9814 to Speaker

0  Asked on January 24, 2021 by ajisu

         

Power Dissipation of Diode

2  Asked on January 24, 2021

         

Atmega32u4 USB 2.0 Routing Check

1  Asked on January 23, 2021 by adam-lee

   

Bench Power Supply Current Rating

2  Asked on January 22, 2021

 

Scaling a 0-90 ohm range to 10-520

1  Asked on January 21, 2021 by michael-lowry

     

12V DC to 12V AC (50 Hz) converter / inverter for low loads (< 1A)

5  Asked on January 21, 2021 by paul-weber

       

Can I use 1 to 2 power adaptor to measure current with multimeter

3  Asked on January 20, 2021 by abdullah-muhanna

   

Ask a Question

Get help from others!

© 2022 AnswerBun.com. All rights reserved. Sites we Love: PCI Database, MenuIva, UKBizDB, Menu Kuliner, Sharing RPP, SolveDir