sw5548 in sell back mode [RE-wrenches]

[Bill Brooks]

Kirk,

Aren't dual SWs fun. Welcome to balancing hell. There was a thread on this a
few months ago. I'll try to dig something up for you.

Bill.


> -----Original Message-----
> From: Kirk Herander [mailto:kirk at vtsolar.com]
> Sent: Thursday, November 15, 2001 5:27 AM
> To: RE-wrenches at topica.com
> Subject: sw5548 in sell back mode [RE-wrenches]
>
>
> 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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