VLF,
After a few months of using my 12V/120Ah LiFePo4 accu (
https://www.robur-akku.de/p/lifepo4-akku-12-volt-120-ah)
i am really happy with the performance!
During an experiment at the ground loop i'm tracking the antenna
current, see an example in the attachment. Since the feed point
resistance is constant, the antenna current is proportional to
the accu
discharge current and also to the voltage (Power supply running
in
fully duty cycle, i.e. not regulated). As you can see the
experiment
took 2.5 hours. The accu has a display (second attachment)
showing the
state of discharge. At the beginning of the experiment, the accu
was
charged to 98%, at the end it was at 18%. As you see in the
graph, the
current and voltage dropped by just 1.6 % after a 50% discharge
and by
12 % at the end of the transmission. These are outstanding
results!
Well, the distributor is German but the accu cells are from
China
anyway. So why not buying in China directly?
There is an online distributor which makes offers that are hard
to
belive!
For example:
https://www.dhgate.com/product/12-v-100ah-lifepo4-battery-for-solar/439384307.html#ctabBox
| 1 kWh/50$
or even:
https://www.dhgate.com/product/60-v-60ah-lifepo4-60-v-60ah-lifepo4-de-litio/445395613.html#s1-9-1b;searl
| 1 kWh/38.3$
How is this possible? Is it just 'fake'? I'm going to risk to
buy one.
No risk, no fun, as someone recently said.
73, Stefan
