The voltage of the cells when building doesn't matter as long as they're all the same.
mcristiani wrote:Thanks for the picture d8veh.
I'm sorry, but I can't visualize the below. What would be a connection to a different voltage? I thought you may have meant running a sensing wire across a different series/group.
"They look OK because they don't run over any connections that are at a different voltage."
If you look at your last photo, the twi shorter white wires run from their solder point to the left, which is OK. If they went to the right, they'd cross the right-side cell group, which is at a different voltage, so if the insulation wore through, there'd be a fire. In that case, you'd need more positive insulation like card or GRP.