28
If your home or your user has constant night time loads like a computer always on or electric
pumps for the pool operation or other, or even a freezer or other, your consumption may be around
4 ~ 5 kWh.
In this case, for example, you can connect 4 x 12 V and 200 Ah to the type OPzV gel that will grant
you self-sufficiency throughout the night because:
Battery energy available in Wh = batt voltage. X Ah capacity x percentage of download
Battery energy available in Wh = 48 V x 200 Ah x 50/100 = 4800 wh = 4,8 kwh
Finally, remember that if you own a
photovoltaic plant with a capacity of
at least 3 kW, you can connect even
with batteries up to 300 Ah.
In the case of your consumption
profile
is
prevalent
during the
summer (for example, the use of air
conditioners), it may be reasonable
to form battery packs also of 300/550
Ah.
To help you choose the capacity and
type of batteries to use fill in the
following Table 4 and Table 5.
Table 4
–
Energy reserve classes for 48V batteries
PV plant power
1 ~ 2 Kw
2 ~ 3 Kw
3 ~ 20 kW
Av
e
ra
ge
N
ig
h
t
ti
m
e
1 ~ 2 kWh
A
A
A
3 ~ 5 kWh
A
B
B
6 ~ 9 kWh
A
B
C
9 ~ 13 kWh
Only summer
*D
*E
*F
