I don't know about power useage/cost savings, but we had a beastly gas-heated commercial dryer at our apartment and it got so hot that the metal rivets on jeans could almost burn you and it would wreck my fragile ladyclothes, so I took to line drying most of my things. Setting the heat to low didn't seem to make much of a difference at all. I swear those settings were deliberate red herrings, just like the fake thermostats they put in big offices.

Then we bought a house that didn't have a washer or dryer. The existing hookup for the dryer was electric, so we bought an electric dryer. I like it so much better because it doesn't trash my clothes - I can put my stretch jeans in it and not wreck the elastic after two or three washings, it's amazing. For huge bulky items, it might take a bit longer to dry, but I can sleep easy knowing the things I'm drying won't get ruined, and that temp settings actually work, that "tumble dry low" is actually "low" and not still scorching hot.

Your gas dryer without temp adjustment sounds like junk. I doubt you could buy a new unit that would give you that performance. My doesn't. If it did I'd replace it with another gas dryer. I don't have solar. If I had 'enough' solar I'd use an electric dryer because it would be more economical. You have to figure your usage. I'd like to get a KIA Niro ev. I'd need more than 4KW.

The solar system provider should be able to help you figure yearly production for your system. You then must estimate dryer usage and costs for gas or electric.

From what I've read online, stay with natural gas for drying clothes.

Like I said, it was a beastly commercial unit (old coin op with price set to zero) so temp controls were probably shot/just never worked, but dear lord it was so HOT.

My husband doesn't like the electric dryer as much because it DOESN'T scorch the clothes. Anyhow, when we plumb/wire our new laundry room (upstairs room instead of the basement), we will have hookups for both gas and electric so we can change our minds in the future. I do think cost/energy-wise, gas is generally the better option, but for wellbeing of my clothes, I've been happy with the electric.

I have experienced yellowing of my clothes with old gas dryers so I like electric but IMO it has a lot to do with the cost of either in your area too.

Where I live, we have such low relative humidity that gas is preferable since it doesn't create as much static. Also, the cost is lower.

I don't have solar so get my electric from landlines, however we do have energy choice which allows us to select our electric provider. Natural gas is so much cheaper for me to run, and my dryer uses low heat with lots of air to dry, so there is never a chance of baked clothes. I know what you mean by the coin operated dryers. When I lived in an apartment there was a laundry for everyone to use and the dryer was coin operated. It scorched several of my clothes. It wasn't the gas flame but it was from the high unregulated heat that was being used.

If you can use your solar panels use electric, otherwise I would use gas, but also compare your gas and electric rates too.