---MIKE--- said:
Your 24 volt system probably consists of two 12 volt batteries in
series. Why can't you connect the inverter to only one of the 12 volt
batteries?
-MIKE
When I asked this in a Finnish newsgroup sfnet.harrastus.elektroniikka,
I got a convincing explanation why this is not recommended in the long
run. If you understand Finnish, here's the authentic quote
"Siksi että akkujen 'välistä' kuormitettaessa latausvirta ei enää mene
juurikaan siihen ensimmäiseen akkuun (12V) ja sen napajännite laskee
..... ->11...12 V. Järjestelmä on kuitenkin 28 V laturilla varustettu...
28V-11V = 17 V ensimmäisen akun napojen välillä (15 V kaasuuntumisjännite).
Lisäksi koko kuormitusvirta menee tuo toisen akun lävitse 10...20 A ja
sen napajännite on 17 V..."
If not, then I try to translate: the whole 24 V system is equipped with
a 28 V charger, and if you load partially only one 12 V battery with
e.g. 15 A current, the charging current barely goes to the first battery
the terminal voltage of which decreases to 11...12 V. Therefore the
terminal voltage of the other battery rises to 28 V - 11 V = 17 V and
almost the whole charging current goes through it. In the quote there is
a term "gas voltage" which I actually don't know what it means, but it
is inclined to be too high (max. 15 V).
I know that the "intermediate 12 V output" is a commonly used technique,
but according to electrotechnical laws, sooner AND later it causes
problems
BR,
Tom