net-metered efficiency observations [RE-wrenches]

Bill Brooks billb at
Thu Mar 18 13:26:12 PST 2004


You mentioned that you have set the sell voltage to 52 Volts. Why is the
sell voltage even being used if this is a net metered system? Normally we
just set the float voltage to 53.6 V (depending on the battery) since this
is temperature compensated. The sell voltage is not temperature compensated.
Although it may be an okay voltage to keep the battery at year-round,
regardless of how well controlled the battery temperature is, it should be
temperature compensated in my view.

You mention that the you think the conversion efficiency is too high. What
are you expecting? I would say that it could be low. Typical nighttime
losses should be .5 to .8 kWh since the unit draws about 50 Watts all night.
Does the MX60 measure power output or power input?


-----Original Message-----
From: Kirk Herander [mailto:kirk at]
Sent: Thursday, March 18, 2004 12:38 PM
To: RE-wrenches at
Subject: Re: net-metered efficiency observations [RE-wrenches]

Todd, The readings were dawn to dusk, and this inverter eats about 1kw of
grid power overnight.

Vermont Solar Engineering
Kirk Herander
North American Board of Certified Energy Practitioners
Certified Solar PV Installer(TM)
Xantrex Certified Dealer Charter Member
NYSERDA-eligible installer
Vermont Solar and Wind Partner

PO Box 697
Burlington, VT. 05402
800.286.1252 - 802.863.1202
fax 802.863.7908

----- Original Message -----
From: "Todd Cory, Mt. Shasta Energy Services" <toddcory at>
To: <RE-wrenches at>
Sent: Thursday, March 18, 2004 3:18 PM
Subject: Re: net-metered efficiency observations [RE-wrenches]

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