ml wrote:

issues. So you would probably be well served by one of the 7AH UPS
batteries from a place such as Batteries Plus. They cost about $25 and
are about 7"Lx2"Wx4"H.

tom
K0TAR


gosh, i sure do appreciate everybody's help, sincerely, but alas, i
still have no concise way to calculate what size battery or cap i need


I thought my statement was clear, but I will repeat it -

"So you would probably be well served by one of the 7AH UPS batteries
from a place such as Batteries Plus. They cost about $25 and are about
7"Lx2"Wx4"H." Float that across your fuel cell and you will be fine.

Of course, if the fuel cell doesn't put out at least 13.5 vclts with
your rig on receive, a "12 volt" float battery won't have enough charge
in it to speak of. Then it would be back to capacitors and the
interesting problem that they would bring along. Such as a 0 volt
charge current that could possibly be damaging to your fuel cell.

This whole thing seems a very expensive way to have not very good
portable power. You have never stated why you must have a fuel cell.
Would you care to enlighten us?

tom
K0TAR