On grid w/battery [RE-wrenches]

[Bill Brooks]

Joel,

If you use the SW as a non-PV UPS, you may end up increasing your losses
rather than reducing them. The float charge for an AGM battery is about
50-Watts (more for flooded and some gels). Without PV you will end up
charging 24-hours a day unless you set it up to bump the battery once a day.

Every inverter has low load losses, so installing a new inverter will
decrease your low irradiance power output--no matter how good it is. I would
encourage you to stay away from the batteryless UT-SW-PV series inverters
since they definitely max power track worse than a battery-based system.

Bill.




-----Original Message-----
From: Joel Davidson [mailto:joeldavidson at earthlink.net]
Sent: Monday, May 27, 2002 6:39 PM
To: RE-wrenches at topica.com
Subject: Re: On grid w/battery [RE-wrenches]


Bill,
If I go with a non-battery inverter, I'd keep my SW4048 and use it for a
non-PV
UPS. The SW harvests 2700 kWh/year, but I wouldn't mind another 135 kWh/year
plus approx. 80 kWh/year that the SW consumes floating the battery at night.
I
think a non-battery inverter would harvest approx. 3000 kWh/year from a 2200
WDC
STC array at a 12 degree tilt in Los Angeles. Does anyone still use the old
UT-SW4048PV non-battery model? If yes, what size array and how many kWh?

Bill Brooks wrote:

> Joel and Marco,
>
> With all do respect to my friends at Advanced Energy, the old SW is our
most
> stable inverter on the market.

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