Mr Lewis, founder and chair of MoneySavingExpert.com, said he believes his bid for a cross-bench peerage was rejected because he was “honest” about the limited time he could commit to the role.
He expressed his desire for “more consensual, co-operative politics”.
Mr Lewis has become increasingly vocal in recent months on behalf of consumers and financially stretched households, amid surging inflation and a cost-of-living crisis.
He said: “I never attack the Tories, I attack the policies of the Government."
Mr Lewis said he was a member of the Liberal Democrats until the age of 24 but has since been a “floating voter”.
Mr Lewis said it was only a number of weeks ago that his attempt to become an independent peer was turned down by the House of Lords Appointments Commission.
The 50-year-old continued: “I did this really silly thing and I was honest in the interview."
He said he told the commission he could only offer a limited number of hours.
He told the BBC's Nick Robinson: “I’m very busy with my job, but most importantly, I have a nine-year-old daughter and until she is 13, my most important job from 6.30pm until 8pm at night is to be with her and put her to bed.
“I would see my role as being learning for three to five years, with limited input and then gradually over the next five to 10 years, committing more time to the House of Lords.”
Mr Lewis suggested this may have represented a “stumbling block” to his application, although he said that the commission invited him to apply again in the future.
He concluded: “I don’t think I was willing to give them the time that they felt was necessary to be in the Lords.”
Martin Lewis wanted to be in the House of Lords
Jeff Overs
The House of Lords is the country's second chamber
House of Lords