John Frum
Tell me your problems
- Joined
- Nov 30, 2019
- Messages
- 15,234
Assumitions
280ah LFP cells and 100amp overkill bms.
We are ignoring the dc load center for load calculations.
Finally we assume Samlex PST series inverters which support external switching and have a conversion efficiency of ~.9.
1st topology can support a 2000 watt inverter.
The constraint is the bms.
2000 ac watts / .9 conversion factor / 24 volts low cutoff = 92.592592593 service amps
2nd topology(Same as the first except the inverter bypasses the bms) can support a 3000 watt inverter
3000 ac watts / .9 conversion factor / 24 volts low cutoff = 138.888888889 service amps
The constraint is a policy decision to limit discharge to .5c.
A side benefit is no pre-charge resistor is required.
q: What is your opinion on having the equipment ground go through the bms but the inverter neg conductor bypassing the bms?
Other observations are also welcome.
Topo diagrams in subsequent message.
280ah LFP cells and 100amp overkill bms.
We are ignoring the dc load center for load calculations.
Finally we assume Samlex PST series inverters which support external switching and have a conversion efficiency of ~.9.
1st topology can support a 2000 watt inverter.
The constraint is the bms.
2000 ac watts / .9 conversion factor / 24 volts low cutoff = 92.592592593 service amps
2nd topology(Same as the first except the inverter bypasses the bms) can support a 3000 watt inverter
3000 ac watts / .9 conversion factor / 24 volts low cutoff = 138.888888889 service amps
The constraint is a policy decision to limit discharge to .5c.
A side benefit is no pre-charge resistor is required.
q: What is your opinion on having the equipment ground go through the bms but the inverter neg conductor bypassing the bms?
Other observations are also welcome.
Topo diagrams in subsequent message.
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