This article was first published by JLG Industries, Inc., and republished here with prior written permission. Copyright © 2020 JLG Industries.
By David Lombardo, Chief Engineer, Electrical, JLG Industries
Whether working in a refrigerated food processing warehouse, a cold storage facility, or outdoors in winter weather conditions, many JLG® battery-powered MEWPs (mobile elevated work platforms) are designed to work in below-freezing temperatures.
However, these cold working environments can impact the performance of the battery, resulting in slower or sluggish machine functionality, and it can also reduce the battery’s capacity by 50%, requiring more frequent charging.
To get the best performance out of your battery-powered MEWP when working in cold environments, it is important to keep the machine’s batteries fully charged and warm. So before getting to work in these conditions, consider being proactive with your daily battery care and preventive maintenance routines in order to prevent downtime resulting from a dead battery in below-freezing temperatures.
Here are four tips to help you do that…
Tip #1: Whenever possible, charge the batteries.
Plugging in a battery-powered MEWP frequently (also known as opportunity charging) to charge the batteries is one of the best ways to safely and productively use these machines in cold environments.
Why? Working in extremely cold temperatures causes bigger drops of voltage in lead-acid batteries (common in many of today’s battery-powered MEWPs) during operation, which results in the machine’s control system thinking the batteries are nearly out of charge. When this happens, the control system, which is designed to protect the machine’s vital components including the battery, will limit performance in order to preserve basic machine functionality.
Keeping the batteries as highly charged as possible will keep the batteries’ voltage in an optimal operating range, resulting in the least amount of voltage drop, as well as will make sure that the most charge from the batteries is available at any given time for continued machine use.
Tip #2: Plug in the batteries overnight.
Plugging in a battery-powered MEWP overnight will ensure that the machine starts each workday fully and completely charged.
How? Charging the batteries overnight will warm-up the batteries, making sure they are ready to work when the machine is turned on in the morning. And having the most charge available from the batteries is the best way to minimize larger voltage drops during operation (remember: This results in the machine trying to conserve its energy by reducing functionality and slowing down operation). Operating with a full charge gives operators the opportunity to complete the maximum amount of work cycles as possible with the machine throughout the workday.
Charging the batteries overnight will also prevent the batteries from becoming deeply discharged. If this happens in extremely cold temperatures, the electrolyte in the batteries can freeze, expand, crack the casing and leak. A frozen battery means the machine won’t function and repairs (or replacement) are required. It is important to note: Never charge a frozen battery as this could cause it to explode.
To maximize uptime and minimize downtime, make sure to charge the battery for 4+ hours (8-10 hours is ideal) in between work shifts.
Tip #3: Keep the batteries warm.
It is best to move the MEWP out of the cold weather before charging its batteries.
Why? Although the MEWP’s batteries can accept a charge when they are cold, it will be at a lower rate. For better results, park the MEWP indoors or in warmer temperatures (at room temperature is best) when charging.
Tip #4: Perform preventive maintenance tasks.
Following the manufacturer’s recommended guidelines for battery maintenance, noted in each JLG MEWP service manual, significantly contributes to getting the most life possible out of the batteries.
How? Changing the hydraulic fluid and filters as prescribed in the JLG service manual (each specific machine has one) will help to avoid potential hydraulic system damage and ensure the best performance when temperatures drop.
And, replacing aged or weakened batteries will ensure that the machine is performing at maximum strength — because as batteries age, they will not perform as well as they had been and are more likely to have issues when working in colder temperatures.
Also, check the batteries’ water levels and top it off if they are low. Remember: Do not use tap water to fill the batteries. It is important to keep the batteries’ electrolyte levels in balance, especially in colder conditions, and to do this, distilled or deionized water is best. Keep a gallon on hand to use as needed.
These are just some of the proactive ways to care for batteries on JLG battery-powered MEWPs when working in below-freezing temperatures. You can find additional tips on keeping JLG MEWPs operating in cold environments here.
(Source: Lombardo, David. “4 Tips for MEWP Operation in Below-Freezing Temperatures.” JLG, JLG Industries, Inc. , www.jlg.com/en/direct-access/2021/01/19/4-tips-for-mewp-operation-in-below-freezing-temperatures.)
JLG Industries, Inc. is the world’s leading designer, manufacturer and marketer of access equipment. The Company’s diverse product portfolio includes leading brands such as JLG® mobile elevating work platforms; JLG and SkyTrak® telehandlers; and an array of complementary accessories that increase the versatility and efficiency of these products. JLG is an Oshkosh Corporation Company [NYSE: OSK]. Copyright © 2020 JLG Industries.
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