[RE-wrenches] FLA battery setpoints with larger arrays

[Dan Fink]

I have always wondered about the thermal math on a new-fangled heat-pump
water heater in a utility room. They basically air-condition the room to
heat water, and the hotter the room, the more efficiently they work. They
do use up some watt-hours for the compressor, not a good choice in a small
off-grid system, but with grid-tie / battery backup maybe so and extend
battery life too?
Anyone tried this?

Dan Fink
Buckville Energy
IREC Certified Instructor™ for:
~ PV Installation Professional
~ Small Wind Installer
NABCEP / IREC / ISPQ Accredited Continuing Education Providers™
970.672.4342



On Mon, May 25, 2015 at 12:05 PM, Darren Anderson <darren at self.org> wrote:

> I’d also be interested to know if anyone is doing active or passive
> cooling for battery banks and what solutions they have come up with. We
> have been exploring various options including solar direct drive cooling,
> DC aircon units, and high efficiency AC aircon units.
>
> As far as I know there are no solar direct drive solutions that are
> commercially available or affordable. There are options in DC-powered units
> - used frequently in the Telecom industry. But the easiest solution,
> especially for AC coupled systems, could be high efficiency AC units that
> could be made to operate with photocell control for daytime operation only.
> One could just cool an insulated battery box, or better yet, the entire
> control room since heat is also the enemy of electronics and it might
> extend the life of inverters and charge controllers as well.
> _________________________
> Darren Anderson | Project Manager
> Solar Electric Light Fund | www.SELF.org
>
>
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