Autonomous photovoltaic system for refrigerator 12V / 65watt - 75 watts
Autonomous photovoltaic kit / package for small refrigerator 65-75 watt / 12V or 220V by adding inverter
A Victron LiFePO4 battery 12,8V/50Ah consists of 4 cells connected in series and has a built-in cell monitor.
Available on backorder
Lithium iron phosphate (LiFePO4 or LFP) is the safest of the main types of lithium-ion batteries. The nominal voltage of an LFP cell is 3,2V (lead-acid batteries: 2V/cell). Therefore, a battery LFP 12,8 V consists of 4 elements connected in series. and a 25,6V battery consists of 8 cells connected in series.
The LFP battery does not need to be fully charged. Lifetime is even slightly improved on a partial charge instead of a full charge. This is a major advantage of LFP compared to lead-acid. Other advantages are wide operating temperature range, excellent cycling performance, low internal resistance and high efficiency.
Efficiency
In many applications (especially off-grid solar and/or wind), energy efficiency can be critical. The round trip energy efficiency of an LFP battery is 92%. The charging process of lead-acid batteries becomes particularly inefficient when the 80% state of charge is reached, resulting in 50% efficiency or even less in solar systems where several days of backup power are required (battery operating at 70% to 100% charged state ). In contrast, an LFP battery will still achieve 90% efficiency under shallow discharge conditions.
Cell balancing and monitoring
LFP batteries have built-in balancing and cell monitoring. Up to 5 batteries can be paralleled and up to four 12V batteries or two 24V batteries can be connected in series so that a 48V battery pack of up to 1500Ah can be assembled. Cell balancing/monitoring cables can and must be connected to a battery management system (BMS).
Bluetooth app available to monitor cell voltage and temperature.
Battery Management System (BMS)
The BMS:
1.It generates an alarm whenever the voltage of a battery cell drops below 3,1V (2,85-3,15V adjustable).
2. Disconnects or turns off the load whenever the voltage of a battery drops below 2,8V (adjustable 2,6V-2,8V).
3. Stops the charging process whenever the voltage of a battery cell rises to more than 4,2V.
4. Shuts down the system whenever the temperature of a cell exceeds 50°C.
Requires one of these BMS:
Dimensions (hxwxd) mm – 199 x 188 x 147
Weight - 7 kg
Nominal energy @ 25°C* – 640 Wh
Battery specifications | ||||||||
VOLTAGE AND CAPACITY |
LFP-
Smart 12,8/50 |
LFP-
Smart 12,8/60 |
LFP-
Smart 12,8/100 |
LFP-
Smart 12,8/160 |
LFP-
Smart 12,8/200 |
LFP-
Smart 12,8/300 |
LFP-
Smart 25,6/200 |
|
Nominal voltage | 12,8V | 12,8V | 12,8V | 12,8V | 12,8V | 12,8V | 25,6V | |
Nominal capacity @ 25°C* | 50Ah | 60Ah | 100Ah | 160Ah | 200Ah | 300Ah | 200Ah | |
Nominal capacity @ 0°C* | 40Ah | 48Ah | 80Ah | 130Ah | 160Ah | 240Ah | 160Ah | |
Nominal capacity @ -20°C* | 25Ah | 30Ah | 50Ah | 80Ah | 100Ah | 150Ah | 100Ah | |
Nominal energy @ 25°C* | 640Wh | 768Wh | 1280Wh | 2048Wh | 2560Wh | 3840Wh | 5120Wh | |
*Discharge current ≤1C | ||||||||
CYCLE LIFE (capacity ≥ 80% of nominal) | ||||||||
80% DoD | 2500 cycles | |||||||
70% DoD | 3000 cycles | |||||||
50% DoD | 5000 cycles | |||||||
DISCHARGE | ||||||||
Maximum continuous
discharge current |
100A | 120A | 200A | 320A | 400A | 600A | 400A | |
Recommended continuous
discharge current |
≤50A | ≤60A | ≤100A | ≤160A | ≤200A | ≤300A | ≤200A | |
End of discharge voltage | 11,2V | 11,2V | 11,2V | 11,2V | 11,2V | 11,2V | 22,4V | |
OPERATING CONDITIONS | ||||||||
Operating temperature | Discharge: -20°C to +50°C | Charge: +5°C to +50°C | ||||||
Storage temperature | -45 ° C to + 70 ° C | |||||||
Humidity (non-condensing) | Max. 95% | |||||||
Protection class | IP 22 | |||||||
CHARGED | ||||||||
Charge voltage | Between 14V/28V and 14,4V/28,8V (14,2V/28,4V recommended) | |||||||
Float voltage | 13,5V / 27V | |||||||
Maximum charge current | 100A | 120A | 200A | 320A | 400A | 600A | 400A | |
Recommended charge
current |
≤30A | ≤30A | ≤50A | ≤80A | ≤100A | ≤150A | ≤100A | |
OTHER | ||||||||
Max storage time @ 25°C* | 1 year | |||||||
BMS connection | Male + female cable with M8 circular connector, length 50cm | |||||||
Power connection (threaded
inserts) |
M8 | M8 | M8 | M8 | M8 | M10 | M8 | |
Dimensions (hxwxd) mm | 199 x 188 x 147 | 239 x 286 x132 | 197 x 321 x 152 | 237 x 321 x 152 | 237 x 321 x 152 | 347 x 425 x 274 | 317 x 631 x 208 | |
Weight | 7kg | 12kg | 15kg | 20kg | 22kg | 51kg | 56kg | |
*When fully charged |
Weight | 3 kg |
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