Can my husband sponsor me as a dependent on his DTV visa with a sponsorship letter instead of needing separate funds?

Yes he can write a sponsorship letter but in that case he will need 12k £ for both of you which is 24k £ total

A sponsorship letter is enough. You do not need the 1 million like some others have suggested

I have DTV, softpower medical, and my husband has the spouse dependant, he supports me financially and yes he wrote me a letter stating so, we only have a joint account, one savings account and one everyday account, he mentioned in the letter about it as I'm not working and earning a wage or getting any government assistance, I cannot open my own account (we are Australian). My visa was approved, it was nearly 2 years ago, so hopefully if your husband's letter explains everything, you should be approved too, we did need to have the 0thb equivalent each

If you don’t have 12k in your own account you would have to get him to write a sponsorship letter but he would need to show a minimum of 24k to show he can support both of you while in Thailand.

Both of you would need a minimum of the equivalent of 500,000 THB each. However, he can write a letter to say he will be sponsoring you financially, but he would then need a minimum of 1,000,000 THB.

A sponsorship is enough or a letter stating that you share assets

A sponsorship letter is accepted - it says when you’re uploading the file