charging effect
I noticed a similar effect when I had my brown's gas device up and running. After producing enough brown's gas the plates started to act like batteries and you could pull off a usable current for a short period. I think it's just a chemical reaction on the plates where one is oxidized and the other is reduced creating the battery effect. However, don't let me discourage you, it's still worth measuring power in and power out to confirm.
I noticed a similar effect when I had my brown's gas device up and running. After producing enough brown's gas the plates started to act like batteries and you could pull off a usable current for a short period. I think it's just a chemical reaction on the plates where one is oxidized and the other is reduced creating the battery effect. However, don't let me discourage you, it's still worth measuring power in and power out to confirm.