sw5548 in sell back mode [RE-wrenches]

[Kirk Herander]

Hi folks,

I have a dual SW5548 power panel programmed for sell back. Both inverters
are programmed identically -
bulk & float set to 52.0 volts, absorption time 0 hours, max sell amps 30,
max charge current 30.0 amp.

The system includes a 5 kw array. I assummed that both inverters would sell
power back equally, but I am witnessing an imbalance.
During a partially sunny day, with the batteries at the sell voltage,
Inverter #1 was showing a positive 1 - 3 amps on AC input, while inverter #2
was showing -13 amps being sold back. In addition, when the PV is turned off
and the batteries are floating at 52.0 volts, inverter #1 is reading +5 amps
on AC input, inverter #2  reading -4 amps. I'd think that charge rate at
float would be balanced also, but no. The inverters' outputs are not
connected to any  AC loads during these observations. Any ideas?

thanks,

Kirk




Vermont Solar Engineering - a Trace Certified Dealer
Kirk Herander
PO Box 697
Burlington, VT. 05402
www.vermontsolar.com
800.286.1252 - 802.863.1202
fax 802.863.7908

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