Another small cheap project. I have multiple generators, and one of them is a WEN GN400iM that I got for $259 or $299 (I forget). Its a pull start unit. Since I live in Houston and these splash lube engines need good oil that won't shear too much, I keep 15W-40 in it. The problem is that during a winter storm, that will be quite a hard pull!
I looked for solutions other than swapping brand new oil out and wasting it, and I landed on a cheap 50w stick on block heater that everyone told me wouldn't work. Well how wrong they were!
Its not super cold out, but I think this is still a good test. When it gets cold, I will test again for sure. Outside temp was right around 52 the entire time per my weather station.
Some notes:
- Stick well, may use some high temp glue/epoxy if I'm happy with the install just to make sure
- It cycles on and off, so it seems the thermal transfer is not super great. Of course the front of the pad gets hot too, so a bit of wasted heat. I think anything more than 50w would be overkill for this size engine.
- Do I trust it powered on in my garage? Unsure. I may put in a small 2a inline fuse
On my cheap WEN GN400iM which is pull start, there is a nice smooth area right near the dipstick, and it just happens to be a perfect size. I cleaned the area with soap and water, and then some alcohol, and slapped it on there, and it seemed to stick really really well.
Starting temp, 54.8. This generator lives in my garage, so I was surprised to see how close to ambient it was. I thought it would be warmer! It did get much lower at night, so possibly its still recovering. Note that after reading temp, I put the dipstick back in
Plugged into my Ecoflow River 2 Pro
As you can see, it draws more than 50w, its actually 77w
After 10 mins, the oil is reading 70.8 degrees. The dip stick was now warm to the touch, and the entire side and the bottom of the generator was warm.
Of course the reading is right near the heat pad, however I did move the engine around a bit and even pull the cord a little just to try and move the oil in the pan, and it stayed the same. This is a very small engine, so I think the oil is probably a fairly even temp. You can see its quite narrow
After another 10 mins, so 20 min total, its at 82!
Did some cable management
And fired it up (Started first pull) and charged the Ecoflow back up
I let the generator run for around 30 mins and it seemed to stay stuck on just fine