GENERAC AND HOME STANDBY GENERATOR TIPS

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Many here (as I do myself) have a Generac or similar home standby generator in their home. They are very reliable, work very well and are extremely useful for an energy thirsty home and modern day living. They can make an extended power loss seem like a "non event" - I have been there many times and glad I did have one!

That said, for reliability there are some simple and important maintenance items that must be payed attention to - especially in harsh environments like extreme heat, rain, high humidity and extended dampness. First of all the car style battery onboard is what enables your generator start up automatically. Your voltage should not fall below 12.9 volts DC and 13.1 - 13.3 would be a more comforting range. In extreme environments a battery's useful life is usually 3-4 years and after that a battery can fail quickly and at any time - I have seen it here in FL many times and suggest not pushing your luck. Replacing it before it fails insures it will work when needed. You do not want your generator failing to automatically start in an emergency. You do not want to have to buy and swap out a battery or jump start it in a storm or emergency situation either - good luck with that. The battery is the only way your generator can start itself. Many of the newer Generac's have self monitoring software onboard that only takes a second to view on your iPhone. It tells you a slew of info on your generator's status, health and maintenance requirements and of course battery life and voltage. Many who own these generators are not even aware of this built in feature! All it requires is downloading the free app, linking it to your smartphone, and using it at least once a week. It is extremely useful!! I highly suggest looking into using this feature if your Generac has it - most new ones do.

The second major item is changing the oil and filter. Even if your generator has not run more than the 5 minutes a week for its weekly exercise and test cycle, precisely because of that moisture and water accumulate in the oil - easy to see when an oil change is performed. Because of lack of use, the water does not burn off and will taint the oil so don't neglect an oil and filter change for lack of emergency use. Changing the oil and oil filter on a Generac standby generator is a very simple procedure and should not be neglected because your generator has not been called into an emergency service. The price of 2 quarts of oil and a can filter is under $23 bucks and cheap insurance to keep the cooling and lubrication system of your expensive generator running properly and adding to its longevity. While you are at it - check and or replace the air filter - again a simple and inexpensive procedure.

The last common item and simple mistake people make is in not locking the Generator's top lid. Not locking it brings a risk of high winds blowing it opened and or blowing it off in a hurricane, wind storm or whatever. It also gives unauthorized access to people and critters who have nothing better to do than to mess with someone else's property. It takes but a few seconds to properly lock the two side locks. If you lost the key, visit any Generac dealer or call them for a replacement.

In my development there are so many here who spend 12-15K getting one of these beasts installed and then never pay attention to it again - until it stops working properly. There is simply no need for this to happen with a few of these simple and easy maintenance tasks.

I hope this helps at least a few here. Not rocket science - just something many forget and neglect and should take a few minutes to check on.

My favorite expression is: Previous Planning Prevents Piss Poor Performance!
 
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Good info, thanks. My generator has a cold start kit which keeps the battery warmer. As It can hit -28F up here at times that is a good option!

Just to add a bit to your lock strategy. My transfer switch is located on the outside of my house. That can/should be locked also. That on mine is locked by padlock.

The key to the padlock is secured under the door to the generator in plain sight.
My generator company which I hold a service contract has told me only a couple keys will unlock most Generac generators. So if the company has to come up they unlock the lid and then have access to the padlock keys!
 
Couple questions as I’m going to install one in the new house we’re building in two yrs. When generator does its test run is it producing electricity? How does that work if electricity is not out? And is it like any other internal combustion engine where it has an air intake? I often wondered what happens if it ends up underwater or sucks in water.
 
not at all familiar with generators, but a smart trickle charger extends the life of the battery's considerably. Do they make generators that can use their electrical connection to maintain the battery till it's needed?
 
Couple questions as I’m going to install one in the new house we’re building in two yrs. When generator does its test run is it producing electricity? How does that work if electricity is not out? And is it like any other internal combustion engine where it has an air intake? I often wondered what happens if it ends up underwater or sucks in water.

You would not want any part to be under water, besides the engine, there could be damage to electrical and electronic components. I have seen them mounted on platforms off the ground. I don't think there is any load on the generator in the weekly test, the service tech does test the transfer switch and put load on when he visits. I believe there is a trickle charger for the battery.
 
My son had a generator installed . I asked him if he ever checks the oil , etc. " No , I have a service contract for all of that " . Whatever ...
I asked him if he knew how to transfer the switch manually ? " No " . Automatic transfer switches can fail . Do you want to sit there in the dark waiting on a service tech that may take days to get to you ? No , he'll call Dad to come show him .
 
My son had a generator installed . I asked him if he ever checks the oil , etc. " No , I have a service contract for all of that " . Whatever ...
I asked him if he knew how to transfer the switch manually ? " No " . Automatic transfer switches can fail . Do you want to sit there in the dark waiting on a service tech that may take days to get to you ? No , he'll call Dad to come show him .

Up here it can run for days. Knowing how to shut it down and check the oil is important. Same for knowing how to run the transfer switch.

I check oil if it runs more than 18 hours straight and repeat at intervals. Yes I know there is a low oil shut off switch but as you say knowing your equipment is a good thing.


As another has posted, part of my winter kit is a battery tender that keeps the battery fully charged.
 
Couple questions as I’m going to install one in the new house we’re building in two yrs. When generator does its test run is it producing electricity? How does that work if electricity is not out? And is it like any other internal combustion engine where it has an air intake? I often wondered what happens if it ends up underwater or sucks in water.

First the easy question. The air and exhaust vents are on the 2 side panels of the unit and have fan driven cooling system.

As for the first question, there is an automatic transfer switch that does not let the generated electricity connect to your home during normal exercising cycles. The unit has an onboard self checking system that checks the electrical output, probably charges the battery and makes sure everything is working as it should. BTW, the electricity that does not get used gets discharged into the atmosphere.
 
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I very recently sold my cabin that was equipped with an 11KW Generac. Since the engine had solid valve lifters, maintaining the correct and very tight (.002-.004) lash (clearance) is absolutely essential. If the clearance is lost, the valves will not seat, resulting in loss of compression, exhaust valve burning, and valve seat recession. Theoretically, after the initial break-in period, the valve train should settle in and become stable. The first valve lash adjustment is critical to long engine life. Do not overlook this important maintenance requirement.

Regarding the use of synthetic oil —- there is no reason to use anything other than synthetic oil. In anything. Lawn mower, air compressor, guns, etc. Because of its molecular structure, it doesn’t oxidize like mineral oil does. I believe that Generac is now offering a branded synthetic oil that their service technicians sell. I know that Mobil 1 works well, but others are likely just as effective.

Tom H.
 
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I every recently sold my cabin that was equipped with an 11KW Generac. Since the engine had solid valve lifters, maintaining the correct and very tight (.002-.004) lash (clearance) is absolutely essential. If the clearance is lost, the valves will not seat, resulting in loss of compression, exhaust valve burning, and valve seat recession. Theoretically, after the initial break-in period, the valve train should settle in and become stable. The first valve lash adjustment is critical to long engine life. Do not overlook this important maintenance requirement.

Regarding the use of synthetic oil —- there is no reason to use anything other than synthetic oil. In anything. Lawn mower, air compressor, guns, etc. Because of its molecular structure, it doesn’t oxidize like mineral oil does. I believe that Generac is now offering a branded synthetic oil that their service technicians sell. I know that Mobil 1 works well, but others are likely just as effective.

Tom H.

You are correct. The valve lash gap (.002" - .004") ) needs to be checked and adjusted after the first 50 hours of running. You are also correct in that many overlook this maintenance detail. I did mine already. It's actually easy for anyone who is familiar with some basic tools and a feeler gauge and has some mechanical engine knowledge. I also changed the gaskets on mine at the same time.

I use Penzoil Ultra Platinum which is way way over kill for the type of oiling system Generac's have. I stock that same oil for all my cars and it is just easier to have 5 gallon containers of one oil type than multiple kinds. Since it only uses 1.9 quarts, I don't care about using super premium oil for the generator - it can never hurt to use something that exceeds the spec's. and it doesn't break the bank.

Oh, BTW, you should always have extra fuses on hand for both the Generac unit (automotive type) and the transfer switch that uses 3 of them (Buss type). Always make sure you have an extra key for the lid as well.

Thank you for posting.
 
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I m SUPER GLAD all my Generac maintenance is up to date BECAUSE Hurricane Milton appears to be headed right for us! I'm sure our power will go out somewhere in the mix.

I haven't decided which is worse, the hurricanes themselves or listening to all the media and weathermen scare the living daylights out of us. Keep your fingers crossed for us guys - looks like there is no avoiding this one and it's supposed to be a bad one.
 
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I very recently sold my cabin that was equipped with an 11KW Generac. Since the engine had solid valve lifters, maintaining the correct and very tight (.002-.004) lash (clearance) is absolutely essential. If the clearance is lost, the valves will not seat, resulting in loss of compression, exhaust valve burning, and valve seat recession. Theoretically, after the initial break-in period, the valve train should settle in and become stable. The first valve lash adjustment is critical to long engine life. Do not overlook this important maintenance requirement.

Regarding the use of synthetic oil —- there is no reason to use anything other than synthetic oil. In anything. Lawn mower, air compressor, guns, etc. Because of its molecular structure, it doesn’t oxidize like mineral oil does. I believe that Generac is now offering a branded synthetic oil that their service technicians sell. I know that Mobil 1 works well, but others are likely just as effective.

Tom H.

I have an 18k Generac which has hydraulic lifters and therefore needs no valve adjustments.
Since all it needs are oil changes and filter replacements along with plugs occasionally, I will do my own service.
 

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