question

@ChrisB13 In off-grid situation with no AC source connected to AC in, my understanding is the following: MP will always try to meet the load demand on it's output. If the demand exceeds the rating of the MP it will shut down on Overload. If load does not exceed MP rating but exceeds battery max current rating (and no solar to support) the battery will shut down. The MP cannot be set to limit this demand from the battery when no AC source available on AC in. If AC in power source, grid or generator, available, excess will come from this source to supplement any shortage from the DC bus. Your options are: 1) Control demand to below battery max rating on MP AC out using load control switchgear 2) Increase battery size so inverter becomes limiting factor and not battery

So, a terrible generator meant that we got to try this out:

When AC Load on MP causes DC Current draw to exceed Max Dishcharge Limit communicated from Pylontech Battery to DVCC, nothing happens!

In the scenario that occcurred:

Setup:

Cheap 3300W AVR Generator as sole AC source to....

Multiplus-ii 3000/48 configured to charge...

Pylontech US3000 also charged by...

1680W of PV in 3s2p configuration via SmartSolar 150/35...

all under DVCC control of Cerbo GX.

Details:

AC Load (all on output of MP) = ~1600W (Washing Machine heating)

Generator managed to supply ~1400W before becoming unstable, remainder supplied by Multiplus inverting from minimal solar output and remainder from US3000 battery.

Whilst adjusting AC Input Limit on Multiplus to find max stable generator output, AC Input disconnected automatically several times due to instability - this left the total load supplied by the DC bus at approx 45A.

The most useful generator settings were to accept wide input frequency, turn off UPS, disable loss of mains detection (this caused total havoc with generator) and turn off Weak AC (this allowed us to increase AC Input Limit a little when charging).

Conclusion: A proper generator is required! However, until that issue has been resolved, it is not a problem to utilise full capability of Pylontech battery output power capability.