I wonder if you couple a small sine wave inverter and a grid tie inverter, you can fake out the grid tie inverter to be off grid? Those are the cheapest per watt inverters if you can get them to run that way.
From: Harold Bledsoe Sent: Tuesday, February 07, 2017 9:55 AM To: [email protected] Subject: Re: [AFMUG] Particularly good recent battery deals? Apologies to Eric for hijacking his thread... It does suck and the logic is flawed. Do they charge more for folks that switched to LED bulbs? No. Do they charge more for folks that have smaller houses, better insulation, or choose not to run the AC sometimes? No. If I had more free time I'd stand up for the principle but at the moment, islanding will just have to do. :-) I suppose I could try to summon the reddit but I do still need electricity for now. -Hal On Tue, Feb 7, 2017 at 11:31 AM Chuck McCown <[email protected]> wrote: I have 10 kW so it would be an extra $70... that sucks. Yeah, I would be buying batts and inverters too. From: Harold Bledsoe Sent: Tuesday, February 07, 2017 9:24 AM To: [email protected] Subject: Re: [AFMUG] Particularly good recent battery deals? When we first did it, we had to pay a $5/mo "administrative" fee for having net metering. Effective Jan 1, they charge an additional $7/kw of installed capacity to offset the lower power usage. I think this new charge literally effects only 1 of their customers. I believe their fear is that things like Tesla powerwall will take off and they won't be able to afford their current lifestyle. ;-) On Tue, Feb 7, 2017 at 9:32 AM Chuck McCown <[email protected]> wrote: I pay 8.50/month. Flat rate. So you are getting a demand charge added? From: Harold Bledsoe Sent: Monday, February 06, 2017 5:37 PM To: [email protected] Subject: Re: [AFMUG] Particularly good recent battery deals? Agreed! I'm going to pull the trigger and try the forklift batteries. Supposedly they will last 3-5x longer than regular deep cycle golf cart batteries. I'll let you guys know in 10-15 years. My motivation is that my home grid tied system saves too much power so the power company added a net meter fee of $7/kw/mo to make up the difference. Alrighty then, guess I'll take half my house off grid. :-) Hal On Mon, Feb 6, 2017 at 1:27 PM Eric Kuhnke <[email protected]> wrote: Anything rated in CCA (cold cranking amps) is not suitable for cyclic solar/wind power applications. If the manufacturer hasn't clearly specified Ah capacity in a table at 5, 10, 20 hour rates it's not designed for repeated discharge. On Mon, Feb 6, 2017 at 5:01 AM, Harold Bledsoe <[email protected]> wrote: Beware of deep cycle marine batteries. These typically are not true deep cycle batteries. At 50% depth of discharge, you can expect around 300 cycles (or 1 year if doing it daily). A true deep cycle battery will do about 3x that number. On Sun, Feb 5, 2017 at 9:00 PM Keefe John <[email protected]> wrote: Exide has a 105 AH battery for $81 http://www.menards.com/main/electrical/batteries-battery-chargers/automotive-lead-acid-batteries/exide-regng-27-12-month-nautilus-marine-deep-cycle-battery/p-1444430136307-c-9100.htm?tid=-3310133469912273928 On February 5, 2017 4:55:55 PM CST, Eric Kuhnke <[email protected]> wrote: Found this, sunelec.com (big solar equipment dealer for off grid) is selling the 106Ah version of these for $185 a piece plus pallet shipping: http://www.outbackpower.com/downloads/documents/Store_the_Energy/energycell_re_top_terminal/energycellREtopterminal_specsheet.pdf Outback, as far as I know, doesn't actually have a battery factory. But they are a fairly large company so they are relabeling somebody else's deep cycle off grid design AGM battery. In terms of $/Wh stored the only thing that beats it is the 6V 225Ah wet cell batteries from Trojan. On Sat, Feb 4, 2017 at 6:00 AM, Harold Bledsoe <[email protected]> wrote: I can across an interesting tip / option - Have you considered going with forklift batteries? They are flooded lead acid however I'm reading that they can last 3x longer than golf cart batteries in PV applications. http://gbindustrialbattery.com/Forklift_Battery_Sizes_and_Specifications_Zone15.html I guess the weight is a downside. Just make sure the whole family eats their Wheaties on moving day. :-) Hal On Thu, Feb 2, 2017 at 7:11 PM Eric Kuhnke <[email protected]> wrote: Looking for a bunch of 12V 100Ah AGM top terminal batteries for off grid PV. Wondering if anyone has recently got a particularly good deal for something like the Trojan T31 or similar. -- Harold Bledsoe -- Sent from my Android device with K-9 Mail. Please excuse my brevity. -- Harold Bledsoe -- Harold Bledsoe
