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Started by ramblinChet , Aug 18 2023 05:45 PM

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13 replies to this topic

#1 ramblinChet

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Gone Traveling
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LocationYorktown, Virginia

Posted 18 August 2023 - 05:45 PM

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Edited by ramblinChet, 06 February 2024 - 08:53 AM.

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#2 goinoregon

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LocationPDX

Posted 18 August 2023 - 09:42 PM

maybe just buy 2 batts? unless u are trying to cut down a tree.

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Oregon

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#3 craig333

Riley's Human

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8,023 posts

LocationSacramento

Posted 18 August 2023 - 10:37 PM

I need to run the math on mine. I just assumed I wouldn't have an issue charging it. Not good to assume.

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#4 Jack

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LocationPortland OR

Posted 19 August 2023 - 12:28 AM

Give yourself some margin - 250W or 500W inverter.

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2015 Fleet on 2019 Ranger

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#5 Atlin

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LocationSequim, WA; Atlin, BC

Posted 19 August 2023 - 03:09 AM

Inverters are pretty inexpensive these days. Worth oversizing a bit, but your calculations look ballpark correct. Most modern alternators on vehicles will put out way more than you need to run a small (250-500W) inverter to charge your saw.

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#6 Vic Harder

Doctor Electric

Site Team
4,974 posts

LocationCalgary, Alberta

Posted 19 August 2023 - 04:20 AM

Yup, your napkin math looks good. Another way to do this math is to take 5AH battery at 56V and convert that to AH for 12V to get it into familiar numbers. so 56/12 = 4.67. Let's round tht up to 5. 5AH * 5 =25AH at 12V.

Now if you are recharging that in 1 hour, you need 25A at roughly 14V = 350Watts.

500W inverter should do it. I suspect your charger will be happier with a pure sine wave style inverter too, so consider that when you are shopping,

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#7 Cpt Davenport

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657 posts

LocationDavenport CA

Posted 19 August 2023 - 05:05 PM

I have a Ryobi chainsaw that runs off the same battery as my other tools. I use this 12v charger for the batteries so no need for inverter.

https://www.amazon.c...e?ie=UTF8&psc=1

This allows me to always have a battery for my drill, impact gun and inflator. Not sure if they make a chainsaw with an 18" bar, so this may not suit your needs.

Note: I no longer carry the chainsaw and replaced it with a bow saw and an axe. The bar oil was just too much of a mess.