House-Wide UPS system

Wouldn't that be 4 strings of 2 batteries in series with a 24V system?

OK. I see what you mean. I thought the Freedom Combi only came in a 24V model.

I will defer to those with more battery knowledge and experience that I, but I think "string" refers to the number of batteries it takes to make up your base voltage. In this case you effectively have 8 "strings" of 1 battery each.

While you are unlikely to experience a problem with 8 new batteries, as they age there is a possibility that one battery will be fall below par and reduce the performace of the other 7 batteries. For this reason, many would have recommended that you purchase eight 3V batteries instead and arrange them in 2 strings of 4 batteries.

I think that I read somewhere that systems should have no more than 3 "strings" for proper monitoring and performance. Perhaps others can chime in with their experience.