12V to mains

JohnBishop · Post by **JohnBishop** » Mon Apr 22, 2024 2:37 pm

Hi All,
I hope you are well. I have silly question but I have this cordless circular saw from DeWalt but when it comes to more cutting these batteries don't last.
Is there any converter/adapter so I can use this saw as corded to mains?
I reckon I need some adapter + inverter.
Please advise

Someone-Else · Post by **Someone-Else** » Mon Apr 22, 2024 3:19 pm

Two choices.

1) Buy a bigger capacity battery

2) Buy a mains circular saw.

You could "cobble together some parts" but a new mains saw would be better and cost less.

JohnBishop · Post by **JohnBishop** » Mon Apr 22, 2024 4:09 pm

Someone-Else wrote: ↑Mon Apr 22, 2024 3:19 pm Two choices.

1) Buy a bigger capacity battery

2) Buy a mains circular saw.

You could "cobble together some parts" but a new mains saw would be better and cost less.

This is what I though to just buy a wired one.

etaf · Post by **etaf** » Mon Apr 22, 2024 4:37 pm

what other cordless tools do you have - maybe a 5Ah battery may help ??
thats what I use with my Circular saw, Planer, Grinder & Recip saw most of the time.
otherwise i have 2Ah and 3.5Ah used on all the other tools

Neelix · Post by **Neelix** » Mon Apr 22, 2024 4:47 pm

What capacity are the desalt batteries

What are you using it for ?

fin · Post by **fin** » Mon Apr 22, 2024 6:08 pm

aye as others said a mains circ saw would be best and if a dewalt attachement existed to convert it well it would likely cost more than a standard mains circ saw anyway.

what is the blade like on the battery saw? the standard blade is rubbish. ive got an erbauer in my dewalt saw which was cheap enough at screwfix.

aeromech3 · Post by **aeromech3** » Tue Apr 23, 2024 3:39 pm

I over stressed my mains Ryobi a few years back and the drive shaft sheared, having many spare blades I looked for a replacement with same 190mm and 16mm bore; found MACALLISTER 1500W MSCS1500 for a reasonable price and bonus was it fitted in the nice carry case of the dead Ryobi; pleased with it, even though a bit loud however the sawdust outlet is on side so you don't get covered.
Still available at the not so favorite paint store and others for £50. And blades at Toolstation #78148 and others.

big-all · Post by **big-all** » Tue Apr 23, 2024 4:30 pm

its quite easy to work out the fuel a battery contains and how long it will last
if you dont know the tools consumption, it can be harder
a 12v will actually be 10.6 v [3x3.6v cells] and the maths you take the volts=10.8+the amp hour rating[call it 2ah] +60 to give you the total amps for a minute so
10.8x 2=21.6x60=1296wm now you need to deduct about 5% as not available for use and another perhaps 5-15% as the battery ages so perhaps 20% less at 1037w so iff your tool is drawing say 300w you will get just over 3 mins

clear as mud

JohnBishop · Post by **JohnBishop** » Mon Apr 29, 2024 10:59 pm

In my case I have 2x 5Ah batteries and if I cut planks it does not last long. I think get myself a corded circular saw.

fin · Post by **fin** » Mon Apr 29, 2024 11:11 pm

JohnBishop wrote: ↑Mon Apr 29, 2024 10:59 pm In my case I have 2x 5Ah batteries and if I cut planks it does not last long. I think get myself a corded circular saw.

if you are using your original blade bin it and buy another. they are rubbish. youll see a massive difference.

if you are ripping rather than cross cutting then yea that is harder on the batteries and if you have a lot to do maybe a corded saw or a flex volt saw would be better or even a table saw.

Grich · Post by **Grich** » Tue Apr 30, 2024 7:34 am

You can definitely convert your cordless DeWalt circular saw to a corded one. Look for a power adapter or inverter that matches your saw's voltage and current requirements. Just make sure it's safe and compatible with your saw's battery connection.

big-all · Post by **big-all** » Tue Apr 30, 2024 9:32 am

lets try a different tack

when you cut a maximum 2mm/3teeth sticking through
is the saw cutting on the back edge as well ?? this will produce black swirls on one side/cut edge

JohnBishop · Post by **JohnBishop** » Wed May 01, 2024 11:08 pm

fin wrote: ↑Mon Apr 29, 2024 11:11 pm
JohnBishop wrote: ↑Mon Apr 29, 2024 10:59 pm In my case I have 2x 5Ah batteries and if I cut planks it does not last long. I think get myself a corded circular saw.
if you are using your original blade bin it and buy another. they are rubbish. youll see a massive difference.

if you are ripping rather than cross cutting then yea that is harder on the batteries and if you have a lot to do maybe a corded saw or a flex volt saw would be better or even a table saw.

I checked and the blade on it was Trend CSB/16548B https://trenddirectuk.com/trend-csb-165 ... -saws.html
I bought a new one Trend CSB/16552T https://www.toolstation.com/trend-craft ... ade/p60567

The saw is DeWalt DCS391

big-all · Post by **big-all** » Thu May 02, 2024 9:01 am

https://youtu.be/Z3WZh6c6-h0

big-all · Post by **big-all** » Thu May 02, 2024 9:13 am

if you look at the saw is the writing on the blade mostly hidden??