SunFrost Voltage Upgrade question [RE-wrenches]

[Allan Sindelar]

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Esteemed Wrenches,
We are upgrading the 12V PV power system of a 1995-era tire house, as the
original U2512SB inverter has failed and Xantrex doesn't support it. We are
raising nominal system voltage to 24V in order to accommodate future system
expansion for new owners. The home includes a 12V DC Sun Frost RF16
fridge/freezer.

What has proven to be a reliable and simple means of running the Sun Frost
off of 24V? I am assuming that I will use a Solar Converters 12/24 20A
converter, which has proven reliable in our experience for other
applications. I don't think we have ever used it on a Sun Frost, and I am
looking for others' experiences. We have also never had a failure with ICT
DC converters.

The batteries are currently to become a single string of L16s (the former
owners brought in grid for backup charging), with eventual plans to increase
battery capacity when these reach end-of-life. I could center-tap off the
bank, as Steve Willey used to suggest, but have not done so, and this will
be the only 12V load.

Your advice is much appreciated.

Allan at Positive Energy


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